Struct staticvec::StaticString [−][src]
pub struct StaticString<const N: usize> { /* fields omitted */ }
Expand description
A fixed-capacity String
-like struct built around an instance of
StaticVec<u8, N>
.
Examples
use staticvec::{StaticString, StringError};
#[derive(Debug)]
pub struct User {
pub username: StaticString<20>,
pub role: StaticString<5>,
}
fn main() -> Result<(), StringError> {
let user = User {
username: StaticString::try_from_str("user")?,
role: StaticString::try_from_str("admin")?,
};
println!("{:?}", user);
Ok(())
}
Implementations
Returns a new StaticString instance.
Example usage:
let string = StaticString::<20>::new();
assert!(string.is_empty());
Creates a new StaticString instance from string
, without doing any checking to ensure that
the length of string
does not exceed the resulting StaticString’s declared capacity.
Safety
The length of string
must not exceed the declared capacity of the StaticString being
created, as this would result in writing to an out-of-bounds memory region.
Example usage:
let string = unsafe { StaticString::<20>::from_str_unchecked("My String") };
assert_eq!(string, "My String");
Creates a new StaticString from string
, truncating string
as necessary if it has
a length greater than the StaticString’s declared capacity.
Example usage:
let string = StaticString::<20>::from_str("My String");
assert_eq!(string, "My String");
let truncate = "0".repeat(21);
let truncated = "0".repeat(20);
let string = StaticString::<20>::from_str(&truncate);
assert_eq!(string, truncated.as_str());
Creates a new StaticString from string
if the length of string
is less than or equal
to the StaticString’s declared capacity, or returns a
CapacityError
otherwise.
Example usage:
let string = StaticString::<20>::from("My String");
assert_eq!(string.as_str(), "My String");
assert_eq!(StaticString::<20>::try_from_str("").unwrap().as_str(), "");
let out_of_bounds = "0".repeat(21);
assert!(StaticString::<20>::try_from_str(out_of_bounds).is_err());
Creates a new StaticString from the contents of an iterator, returning immediately if and when the StaticString reaches maximum capacity regardless of whether or not the iterator still has more items to yield.
Example usage:
let string = StaticString::<300>::from_iterator(&["My String", " Other String"][..]);
assert_eq!(string.as_str(), "My String Other String");
let out_of_bounds = (0..400).map(|_| "000");
let truncated = "0".repeat(18);
let truncate = StaticString::<20>::from_iterator(out_of_bounds);
assert_eq!(truncate.as_str(), truncated.as_str());
pub fn try_from_iterator<U: AsRef<str>, I: IntoIterator<Item = U>>(
iter: I
) -> Result<Self, CapacityError<N>>
pub fn try_from_iterator<U: AsRef<str>, I: IntoIterator<Item = U>>(
iter: I
) -> Result<Self, CapacityError<N>>
Creates a new StaticString from the contents of an iterator if the iterator has a length less
than or equal to the StaticString’s declared capacity, or returns a
CapacityError
otherwise.
Example usage:
let string = StaticString::<300>::try_from_iterator(
&["My String", " My Other String"][..]
).unwrap();
assert_eq!(string.as_str(), "My String My Other String");
let out_of_bounds = (0..100).map(|_| "000");
assert!(StaticString::<20>::try_from_iterator(out_of_bounds).is_err());
Creates a new StaticString from the contents of a char
iterator, returning immediately if
and when the StaticString reaches maximum capacity regardless of whether or not the iterator
still has more items to yield.
let string = StaticString::<20>::from_chars("My String".chars());
assert_eq!(string, "My String");
let out_of_bounds = "0".repeat(21);
let truncated = "0".repeat(20);
let truncate = StaticString::<20>::from_chars(out_of_bounds.chars());
assert_eq!(truncate.as_str(), truncated.as_str());
Creates a new StaticString from the contents of a char
iterator if the iterator has a length
less than or equal to the StaticString’s declared capacity, or returns
StringError::OutOfBounds
otherwise.
Example usage:
let string = StaticString::<20>::try_from_chars("My String".chars())?;
assert_eq!(string.as_str(), "My String");
let out_of_bounds = "0".repeat(21);
assert!(StaticString::<20>::try_from_chars(out_of_bounds.chars()).is_err());
Creates a new StaticString instance from the provided byte slice, without doing any checking to ensure that the slice contains valid UTF-8 data and has a length less than or equal to the declared capacity of the StaticString.
Safety
The length of the slice must not exceed the declared capacity of the StaticString being created, as this would result in writing to an out-of-bounds memory region.
The slice must also contain strictly valid UTF-8 data, as if it does not, various assumptions made in the internal implementation of StaticString will be silently invalidated, almost certainly eventually resulting in undefined behavior.
Example usage:
let string = unsafe { StaticString::<20>::from_utf8_unchecked("My String") };
assert_eq!(string, "My String");
// Undefined behavior, don't do it:
// let out_of_bounds = "0".repeat(300);
// let ub = unsafe { StaticString::<20>::from_utf8_unchecked(out_of_bounds)) };
Creates a new StaticString instance from the provided byte slice, returning
StringError::Utf8
on invalid UTF-8 data, and truncating the input slice as necessary if
it has a length greater than the declared capacity of the StaticString being created.
Example usage:
let string = StaticString::<20>::from_utf8("My String")?;
assert_eq!(string, "My String");
let invalid_utf8 = [0, 159, 146, 150];
assert!(StaticString::<20>::from_utf8(invalid_utf8).unwrap_err().is_utf8());
let out_of_bounds = "0".repeat(300);
assert_eq!(StaticString::<20>::from_utf8(out_of_bounds.as_bytes())?.as_str(), "0".repeat(20).as_str());
Creates a new StaticString from the provided byte slice, returning StringError::Utf8
on
invalid UTF-8 data or StringError::OutOfBounds
if the slice has a length greater than
the StaticString’s declared capacity.
Example usage:
let string = StaticString::<20>::try_from_utf8("My String")?;
assert_eq!(string, "My String");
let invalid_utf8 = [0, 159, 146, 150];
assert!(StaticString::<20>::try_from_utf8(invalid_utf8).unwrap_err().is_utf8());
let out_of_bounds = "0000".repeat(400);
assert!(StaticString::<20>::try_from_utf8(out_of_bounds.as_bytes()).unwrap_err().is_out_of_bounds());
Creates a new StaticString instance from the provided u16
slice, replacing invalid UTF-16
data with REPLACEMENT_CHARACTER
(�), and truncating the input slice as necessary if
it has a length greater than the declared capacity of the StaticString being created.
Example usage:
let music = [0xD834, 0xDD1E, 0x006d, 0x0075, 0x0073, 0x0069, 0x0063];
let string = StaticString::<20>::from_utf16_lossy(music);
assert_eq!(string, "𝄞music");
let invalid_utf16 = [0xD834, 0xDD1E, 0x006d, 0x0075, 0xD800, 0x0069, 0x0063];
assert_eq!(StaticString::<20>::from_utf16_lossy(invalid_utf16).as_str(), "𝄞mu\u{FFFD}ic");
let out_of_bounds: Vec<u16> = (0..300).map(|_| 0).collect();
assert_eq!(StaticString::<20>::from_utf16_lossy(&out_of_bounds).as_str(), "\0".repeat(20).as_str());
Creates a new StaticString instance from the provided u16
slice, returning
StringError::Utf16
on invalid UTF-16 data, and truncating the input slice as necessary if
it has a length greater than the declared capacity of the StaticString being created.
Example usage:
let music = [0xD834, 0xDD1E, 0x006d, 0x0075, 0x0073, 0x0069, 0x0063];
let string = StaticString::<20>::from_utf16(music)?;
assert_eq!(string.as_str(), "𝄞music");
let invalid_utf16 = [0xD834, 0xDD1E, 0x006d, 0x0075, 0xD800, 0x0069, 0x0063];
assert!(StaticString::<20>::from_utf16(invalid_utf16).unwrap_err().is_utf16());
let out_of_bounds: Vec<u16> = (0..300).map(|_| 0).collect();
assert_eq!(StaticString::<20>::from_utf16(out_of_bounds)?.as_str(),
"\0".repeat(20).as_str());
Creates a new StaticString from the provided u16
slice, returning StringError::Utf16
on
invalid UTF-16 data or StringError::OutOfBounds
if the slice has a length greater than the
declared capacity of the StaticString being created.
Example usage:
let music = [0xD834, 0xDD1E, 0x006d, 0x0075, 0x0073, 0x0069, 0x0063];
let string = StaticString::<20>::try_from_utf16(music)?;
assert_eq!(string.as_str(), "𝄞music");
let invalid_utf16 = [0xD834, 0xDD1E, 0x006d, 0x0075, 0xD800, 0x0069, 0x0063];
assert!(StaticString::<20>::try_from_utf16(invalid_utf16).unwrap_err().is_utf16());
let out_of_bounds: StaticVec<u16, 300> = (0..300).map(|_| 0).collect();
assert!(StaticString::<20>::try_from_utf16(out_of_bounds).unwrap_err().is_out_of_bounds());
Extracts a str
slice containing the entire contents of the StaticString.
Example usage:
let s = StaticString::<20>::from_str("My String");
assert_eq!(s.as_str(), "My String");
Extracts a mutable str
slice containing the entire contents of the StaticString.
Example usage:
let mut s = StaticString::<20>::from_str("My String");
assert_eq!(s.as_mut_str(), "My String");
Extracts a u8
slice containing the entire contents of the StaticString.
Example usage:
let s = StaticString::<20>::from_str("My String");
assert_eq!(s.as_bytes(), "My String".as_bytes());
Returns the StaticString’s internal instance of StaticVec<u8, N>
.
Note that using this function consumes the StaticString.
Example usage:
let s = StaticString::<5>::from("hello");
let bytes = s.into_bytes();
assert_eq!(&bytes[..], &[104, 101, 108, 108, 111][..]);
Extracts a mutable u8
slice containing the entire contents of the StaticString.
Safety
Care must be taken to ensure that the returned u8
slice is not mutated in such a way that
it no longer amounts to valid UTF-8.
Example usage:
let mut s = StaticString::<20>::try_from_str("My String")?;
assert_eq!(unsafe { s.as_mut_bytes() }, "My String".as_bytes());
Returns a mutable reference to the StaticString’s backing StaticVec.
Safety
Care must be taken to ensure that the returned StaticVec reference is not mutated in such a way that it no longer contains valid UTF-8.
Example usage:
let mut s = StaticString::<20>::try_from_str("My String")?;
assert_eq!(unsafe { s.as_mut_staticvec() }, "My String".as_bytes());
Returns the total capacity of the StaticString.
This is always equivalent to the generic N
parameter it was declared with,
which determines the fixed size of the backing StaticVec instance.
Example usage:
assert_eq!(StaticString::<32>::new().capacity(), 32);
Returns the remaining capacity (which is to say, self.capacity() - self.len()
) of the
StaticString.
Example usage:
assert_eq!(StaticString::<32>::from("abcd").remaining_capacity(), 28);
Pushes string
to the StaticString without doing any checking to ensure that self.len() + string.len()
does not exceed the StaticString’s total capacity.
Safety
self.len() + string.len()
must not exceed the total capacity of the StaticString
instance, as this would result in writing to an out-of-bounds memory region.
Example usage:
let mut s = StaticString::<6>::from("foo");
unsafe { s.push_str_unchecked("bar") };
assert_eq!(s, "foobar");
Attempts to push string
to the StaticString, panicking if it is the case that self.len() + string.len()
exceeds the StaticString’s total capacity.
Example usage:
let mut s = StaticString::<6>::from("foo");
s.push_str("bar");
assert_eq!(s, "foobar");
Attempts to push string
to the StaticString. Truncates string
as necessary (or simply does
nothing at all) if it is the case that self.len() + string.len()
exceeds the
StaticString’s total capacity.
Example usage:
let mut s = StaticString::<300>::try_from_str("My String")?;
s.push_str_truncating(" My other String");
assert_eq!(s.as_str(), "My String My other String");
let mut s = StaticString::<20>::new();
s.push_str_truncating("0".repeat(21));
assert_eq!(s.as_str(), "0".repeat(20).as_str());
pub const fn try_push_str<S: ~constAsRef<str>>(
&mut self,
string: S
) -> Result<(), CapacityError<N>>
pub const fn try_push_str<S: ~constAsRef<str>>(
&mut self,
string: S
) -> Result<(), CapacityError<N>>
Pushes string
to the StaticString if self.len() + string.len()
does not exceed
the StaticString’s total capacity, or returns a
CapacityError
otherwise.
Example usage:
let mut s = StaticString::<300>::from("My String");
s.try_push_str(" My other String").unwrap();
assert_eq!(s.as_str(), "My String My other String");
assert!(s.try_push_str("0".repeat(300)).is_err());
Appends the given char to the end of the StaticString without doing any checking to ensure
that self.len() + character.len_utf8()
does not exceed the total capacity of the
StaticString instance.
Safety
self.len() + character.len_utf8()
must not exceed the total capacity of the StaticString
instance, as this would result in writing to an out-of-bounds memory region.
Example usage:
let mut s = StaticString::<20>::try_from_str("My String")?;
unsafe { s.push_unchecked('!') };
assert_eq!(s.as_str(), "My String!");
// Undefined behavior, don't do it:
// s = StaticString::<20>::try_from_str(&"0".repeat(20))?;
// s.push_unchecked('!');
Appends the given char to the end of the StaticString, panicking if the StaticString is already at maximum capacity.
Example usage:
let mut string = StaticString::<2>::new();
string.push('a');
string.push('b');
assert_eq!(&string[..], "ab");
Appends the given char to the end of the StaticString, returning StringError::OutOfBounds
if the StaticString is already at maximum capacity.
Example usage:
let mut s = StaticString::<20>::try_from_str("My String")?;
s.try_push('!')?;
assert_eq!(s.as_str(), "My String!");
let mut s = StaticString::<20>::try_from_str(&"0".repeat(20))?;
assert!(s.try_push('!').is_err());
Truncates the StaticString to new_len
if new_len
is less than or equal to the
StaticString’s current length, or does nothing otherwise. Panics if new_len
does not lie
at a valid UTF-8 character boundary.
Example usage:
let mut s = StaticString::<20>::from("My String");
s.truncate(5);
assert_eq!(s, "My St");
// Does nothing
s.truncate(6);
assert_eq!(s, "My St");
// Would panic
// let mut s2 = StaticString::<20>::from("🤔");
// s2.truncate(1);
Returns the last character in the StaticString in Some
if the StaticString’s current length
is greater than zero, or None
otherwise.
Example usage:
let mut s = StaticString::<20>::try_from_str("A🤔")?;
assert_eq!(s.pop(), Some('🤔'));
assert_eq!(s.pop(), Some('A'));
assert_eq!(s.pop(), None);
Removes all whitespace from the beginning and end of the StaticString, if any is present.
Example usage:
let mut string = StaticString::<300>::try_from_str(" to be trimmed ")?;
string.trim();
assert_eq!(string.as_str(), "to be trimmed");
let mut string = StaticString::<20>::try_from_str(" 🤔")?;
string.trim();
assert_eq!(string.as_str(), "🤔");
Removes the char at index
from the StaticString if index
is both less than self.len()
and also lies at a valid UTF-8 character boundary, or panics otherwise.
Example usage:
let mut s = StaticString::<20>::from("ABCD🤔");
assert_eq!(s.remove(0), 'A');
assert!(s == "BCD🤔");
assert_eq!(s.remove(2), 'D');
assert!(s == "BC🤔");
Removes all matches of pattern pat
in the StaticString
.
Example usage:
let mut s = staticstring!("Trees are not green, the sky is not blue.");
s.remove_matches("not ");
assert_eq!("Trees are green, the sky is blue.", s.as_str());
Matches will be detected and removed iteratively, so in cases where patterns overlap, only the first pattern will be removed:
let mut s = staticstring!("banana");
s.remove_matches("ana");
assert_eq!("bna", s.as_str());
Removes all characters from the StaticString except for those specified by the predicate function.
Example usage:
let mut s = StaticString::<20>::from("ABCD🤔");
s.retain(|c| c != '🤔');
assert_eq!(s, "ABCD");
Inserts character
at index
, shifting any values that exist in positions greater than
index
to the right.
Does not do any checking to ensure that character.len_utf8() + self.len()
does not exceed
the total capacity of the StaticString or that index
lies at a valid UTF-8 character
boundary.
Safety
The length of the StaticString prior to calling this function must be less than its total capacity, as if this in not the case it will result in writing to an out-of-bounds memory region.
Index
must also lie at a valid UTF-8 character boundary, as if it does not, various
assumptions made in the internal implementation of StaticString will be silently
invalidated, almost certainly eventually resulting in undefined behavior.
Example usage:
let mut s = StaticString::<20>::try_from_str("ABCD🤔")?;
unsafe { s.insert_unchecked(1, 'A') };
unsafe { s.insert_unchecked(1, 'B') };
assert_eq!(s.as_str(), "ABABCD🤔");
// Undefined behavior, don't do it:
// s.insert(20, 'C');
// s.insert(8, 'D');
Inserts character
at index
, shifting any values that exist in positions greater than
index
to the right.
Returns StringError::OutOfBounds
if character.len_utf8() + self.len()
exceeds the total
capacity of the StaticString and StringError::NotCharBoundary
if index
does not lie at
a valid UTF-8 character boundary.
Example usage:
let mut s = StaticString::<20>::try_from_str("ABCD🤔")?;
s.try_insert(1, 'E')?;
s.try_insert(2, 'F')?;
assert_eq!(s.as_str(), "AEFBCD🤔");
assert!(s.try_insert(20, 'C').unwrap_err().is_not_char_boundary());
assert!(s.try_insert(8, 'D').unwrap_err().is_not_char_boundary());
let mut s = StaticString::<20>::try_from_str(&"0".repeat(20))?;
assert!(s.try_insert(0, 'C').unwrap_err().is_out_of_bounds());
Inserts character
at index
, shifting any values that exist in positions greater than
index
to the right.
Panics if character.len_utf8() + self.len()
exceeds the total capacity of the StaticString
or if index
does not lie at a valid UTF-8 character boundary.
Example usage:
let mut s = StaticString::<3>::new();
s.insert(0, 'f');
s.insert(1, 'o');
s.insert(2, 'o');
assert_eq!(s, "foo");
Inserts string
at index
, shifting any values that exist in positions greater than
index
to the right.
Does not do any checking to ensure that self.len() + string.len()
does not exceed
the total capacity of the StaticString or that index
lies at a valid UTF-8
character boundary.
Safety
self.len() + string.len()
must not exceed the total capacity of the StaticString instance,
as this would result in writing to an out-of-bounds memory region.
Index
must also lie at a valid UTF-8 character boundary, as if it does not, various
assumptions made in the internal implementation of StaticString will be silently
invalidated, almost certainly eventually resulting in undefined behavior.
Example usage:
let mut s = StaticString::<20>::from_str("ABCD🤔");
unsafe { s.insert_str_unchecked(1, "AB") };
unsafe { s.insert_str_unchecked(1, "BC") };
assert_eq!(s, "ABCABBCD🤔");
// Undefined behavior, don't do it:
// unsafe { s.insert_str_unchecked(20, "C") };
// unsafe { s.insert_str_unchecked(10, "D") };
// unsafe { s.insert_str_unchecked(1, "0".repeat(20)) };
Inserts string
at index
, shifting any values that exist in positions greater than
index
to the right.
Panics if index
is greater than the length of the StaticString or if it does not lie
at a valid UTF-8 character boundary, as well as if string.len() + self.len()
exceeds
the total capacity of the StaticString.
Example usage:
let mut s = StaticString::<20>::from("ABCD🤔");
s.insert_str(1, "AB");
s.insert_str(1, "BC");
assert_eq!(s.as_str(), "ABCABBCD🤔");
pub fn try_insert_str<S: AsRef<str>>(
&mut self,
index: usize,
string: S
) -> Result<(), StringError>
pub fn try_insert_str<S: AsRef<str>>(
&mut self,
index: usize,
string: S
) -> Result<(), StringError>
Inserts string
at index
, shifting any values that exist in positions greater than
index
to the right.
Returns StringError::OutOfBounds
if self.len() + string.len()
exceeds the total
capacity of the StaticString and StringError::NotCharBoundary
if index
does not
lie at a valid UTF-8 character boundary.
Example usage:
let mut string = StaticString::<20>::try_from_str("ABCD🤔")?;
string.try_insert_str(1, "AB")?;
string.try_insert_str(1, "BC")?;
assert!(string.try_insert_str(1, "0".repeat(20)).unwrap_err().is_out_of_bounds());
assert_eq!(string.as_str(), "ABCABBCD🤔");
assert!(string.try_insert_str(20, "C").unwrap_err().is_not_char_boundary());
assert!(string.try_insert_str(10, "D").unwrap_err().is_not_char_boundary());
Returns the current length of the StaticString.
Example usage:
let mut s = StaticString::<20>::from("ABCD");
assert_eq!(s.len(), 4);
s.push('🤔');
assert_eq!(s.len(), 8);
Returns true if the StaticString has a current length of 0.
Example usage:
let mut s = staticstring!("ABCD");
assert!(!s.is_empty());
s.clear();
assert!(s.is_empty());
Returns true if the StaticString’s length is equal to its capacity.
Example usage:
let mut s = staticstring!("ABCD");
assert!(s.is_full());
s.clear();
assert!(!s.is_full());
Splits the StaticString in two if at
is less than the its current length.
The original StaticString will contain elements 0..at
, and the new one will contain
elements at..self.len()
.
Panics if at
is greater than the length of the StaticString or if it does not
lie at a valid UTF-8 character boundary.
Example usage:
let mut ab = StaticString::<4>::from("ABCD");
let cd = ab.split_off(2);
assert_eq!(ab, "AB");
assert_eq!(cd, "CD");
Removes all contents from the StaticString and sets its length back to zero.
Example usage:
let mut s = StaticString::<20>::try_from_str("ABCD")?;
assert!(!s.is_empty());
s.clear();
assert!(s.is_empty());
Removes the specified range from the StaticString and replaces it with the provided input
(which does not need to have the same length as the range being removed), panicking if
either the high or low bounds of the range exceed self.len()
or do not lie at valid UTF-8
character boundaries.
Example usage:
let mut s = StaticString::<20>::from("ABCD🤔");
s.replace_range(2..4, "EFGHI");
assert_eq!(s.as_str(), "ABEFGHI🤔");
Methods from Deref<Target = str>
Returns the length of self
.
This length is in bytes, not char
s or graphemes. In other words,
it might not be what a human considers the length of the string.
Examples
Basic usage:
let len = "foo".len();
assert_eq!(3, len);
assert_eq!("ƒoo".len(), 4); // fancy f!
assert_eq!("ƒoo".chars().count(), 3);
Returns true
if self
has a length of zero bytes.
Examples
Basic usage:
let s = "";
assert!(s.is_empty());
let s = "not empty";
assert!(!s.is_empty());
Checks that index
-th byte is the first byte in a UTF-8 code point
sequence or the end of the string.
The start and end of the string (when index == self.len()
) are
considered to be boundaries.
Returns false
if index
is greater than self.len()
.
Examples
let s = "Löwe 老虎 Léopard";
assert!(s.is_char_boundary(0));
// start of `老`
assert!(s.is_char_boundary(6));
assert!(s.is_char_boundary(s.len()));
// second byte of `ö`
assert!(!s.is_char_boundary(2));
// third byte of `老`
assert!(!s.is_char_boundary(8));
Converts a mutable string slice to a mutable byte slice.
Safety
The caller must ensure that the content of the slice is valid UTF-8
before the borrow ends and the underlying str
is used.
Use of a str
whose contents are not valid UTF-8 is undefined behavior.
Examples
Basic usage:
let mut s = String::from("Hello");
let bytes = unsafe { s.as_bytes_mut() };
assert_eq!(b"Hello", bytes);
Mutability:
let mut s = String::from("🗻∈🌏");
unsafe {
let bytes = s.as_bytes_mut();
bytes[0] = 0xF0;
bytes[1] = 0x9F;
bytes[2] = 0x8D;
bytes[3] = 0x94;
}
assert_eq!("🍔∈🌏", s);
Converts a string slice to a raw pointer.
As string slices are a slice of bytes, the raw pointer points to a
u8
. This pointer will be pointing to the first byte of the string
slice.
The caller must ensure that the returned pointer is never written to.
If you need to mutate the contents of the string slice, use as_mut_ptr
.
Examples
Basic usage:
let s = "Hello";
let ptr = s.as_ptr();
Converts a mutable string slice to a raw pointer.
As string slices are a slice of bytes, the raw pointer points to a
u8
. This pointer will be pointing to the first byte of the string
slice.
It is your responsibility to make sure that the string slice only gets modified in a way that it remains valid UTF-8.
1.20.0[src]pub fn get<I>(&self, i: I) -> Option<&<I as SliceIndex<str>>::Output> where
I: SliceIndex<str>,
pub fn get<I>(&self, i: I) -> Option<&<I as SliceIndex<str>>::Output> where
I: SliceIndex<str>,
Returns a subslice of str
.
This is the non-panicking alternative to indexing the str
. Returns
None
whenever equivalent indexing operation would panic.
Examples
let v = String::from("🗻∈🌏");
assert_eq!(Some("🗻"), v.get(0..4));
// indices not on UTF-8 sequence boundaries
assert!(v.get(1..).is_none());
assert!(v.get(..8).is_none());
// out of bounds
assert!(v.get(..42).is_none());
1.20.0[src]pub fn get_mut<I>(
&mut self,
i: I
) -> Option<&mut <I as SliceIndex<str>>::Output> where
I: SliceIndex<str>,
pub fn get_mut<I>(
&mut self,
i: I
) -> Option<&mut <I as SliceIndex<str>>::Output> where
I: SliceIndex<str>,
Returns a mutable subslice of str
.
This is the non-panicking alternative to indexing the str
. Returns
None
whenever equivalent indexing operation would panic.
Examples
let mut v = String::from("hello");
// correct length
assert!(v.get_mut(0..5).is_some());
// out of bounds
assert!(v.get_mut(..42).is_none());
assert_eq!(Some("he"), v.get_mut(0..2).map(|v| &*v));
assert_eq!("hello", v);
{
let s = v.get_mut(0..2);
let s = s.map(|s| {
s.make_ascii_uppercase();
&*s
});
assert_eq!(Some("HE"), s);
}
assert_eq!("HEllo", v);
1.20.0[src]pub unsafe fn get_unchecked<I>(&self, i: I) -> &<I as SliceIndex<str>>::Output where
I: SliceIndex<str>,
pub unsafe fn get_unchecked<I>(&self, i: I) -> &<I as SliceIndex<str>>::Output where
I: SliceIndex<str>,
Returns an unchecked subslice of str
.
This is the unchecked alternative to indexing the str
.
Safety
Callers of this function are responsible that these preconditions are satisfied:
- The starting index must not exceed the ending index;
- Indexes must be within bounds of the original slice;
- Indexes must lie on UTF-8 sequence boundaries.
Failing that, the returned string slice may reference invalid memory or
violate the invariants communicated by the str
type.
Examples
let v = "🗻∈🌏";
unsafe {
assert_eq!("🗻", v.get_unchecked(0..4));
assert_eq!("∈", v.get_unchecked(4..7));
assert_eq!("🌏", v.get_unchecked(7..11));
}
1.20.0[src]pub unsafe fn get_unchecked_mut<I>(
&mut self,
i: I
) -> &mut <I as SliceIndex<str>>::Output where
I: SliceIndex<str>,
pub unsafe fn get_unchecked_mut<I>(
&mut self,
i: I
) -> &mut <I as SliceIndex<str>>::Output where
I: SliceIndex<str>,
Returns a mutable, unchecked subslice of str
.
This is the unchecked alternative to indexing the str
.
Safety
Callers of this function are responsible that these preconditions are satisfied:
- The starting index must not exceed the ending index;
- Indexes must be within bounds of the original slice;
- Indexes must lie on UTF-8 sequence boundaries.
Failing that, the returned string slice may reference invalid memory or
violate the invariants communicated by the str
type.
Examples
let mut v = String::from("🗻∈🌏");
unsafe {
assert_eq!("🗻", v.get_unchecked_mut(0..4));
assert_eq!("∈", v.get_unchecked_mut(4..7));
assert_eq!("🌏", v.get_unchecked_mut(7..11));
}
👎 Deprecated since 1.29.0: use get_unchecked(begin..end)
instead
use get_unchecked(begin..end)
instead
Creates a string slice from another string slice, bypassing safety checks.
This is generally not recommended, use with caution! For a safe
alternative see str
and Index
.
This new slice goes from begin
to end
, including begin
but
excluding end
.
To get a mutable string slice instead, see the
slice_mut_unchecked
method.
Safety
Callers of this function are responsible that three preconditions are satisfied:
begin
must not exceedend
.begin
andend
must be byte positions within the string slice.begin
andend
must lie on UTF-8 sequence boundaries.
Examples
Basic usage:
let s = "Löwe 老虎 Léopard";
unsafe {
assert_eq!("Löwe 老虎 Léopard", s.slice_unchecked(0, 21));
}
let s = "Hello, world!";
unsafe {
assert_eq!("world", s.slice_unchecked(7, 12));
}
👎 Deprecated since 1.29.0: use get_unchecked_mut(begin..end)
instead
use get_unchecked_mut(begin..end)
instead
Creates a string slice from another string slice, bypassing safety
checks.
This is generally not recommended, use with caution! For a safe
alternative see str
and IndexMut
.
This new slice goes from begin
to end
, including begin
but
excluding end
.
To get an immutable string slice instead, see the
slice_unchecked
method.
Safety
Callers of this function are responsible that three preconditions are satisfied:
begin
must not exceedend
.begin
andend
must be byte positions within the string slice.begin
andend
must lie on UTF-8 sequence boundaries.
Divide one string slice into two at an index.
The argument, mid
, should be a byte offset from the start of the
string. It must also be on the boundary of a UTF-8 code point.
The two slices returned go from the start of the string slice to mid
,
and from mid
to the end of the string slice.
To get mutable string slices instead, see the split_at_mut
method.
Panics
Panics if mid
is not on a UTF-8 code point boundary, or if it is
past the end of the last code point of the string slice.
Examples
Basic usage:
let s = "Per Martin-Löf";
let (first, last) = s.split_at(3);
assert_eq!("Per", first);
assert_eq!(" Martin-Löf", last);
Divide one mutable string slice into two at an index.
The argument, mid
, should be a byte offset from the start of the
string. It must also be on the boundary of a UTF-8 code point.
The two slices returned go from the start of the string slice to mid
,
and from mid
to the end of the string slice.
To get immutable string slices instead, see the split_at
method.
Panics
Panics if mid
is not on a UTF-8 code point boundary, or if it is
past the end of the last code point of the string slice.
Examples
Basic usage:
let mut s = "Per Martin-Löf".to_string();
{
let (first, last) = s.split_at_mut(3);
first.make_ascii_uppercase();
assert_eq!("PER", first);
assert_eq!(" Martin-Löf", last);
}
assert_eq!("PER Martin-Löf", s);
Returns an iterator over the char
s of a string slice.
As a string slice consists of valid UTF-8, we can iterate through a
string slice by char
. This method returns such an iterator.
It’s important to remember that char
represents a Unicode Scalar
Value, and might not match your idea of what a ‘character’ is. Iteration
over grapheme clusters may be what you actually want. This functionality
is not provided by Rust’s standard library, check crates.io instead.
Examples
Basic usage:
let word = "goodbye";
let count = word.chars().count();
assert_eq!(7, count);
let mut chars = word.chars();
assert_eq!(Some('g'), chars.next());
assert_eq!(Some('o'), chars.next());
assert_eq!(Some('o'), chars.next());
assert_eq!(Some('d'), chars.next());
assert_eq!(Some('b'), chars.next());
assert_eq!(Some('y'), chars.next());
assert_eq!(Some('e'), chars.next());
assert_eq!(None, chars.next());
Remember, char
s might not match your intuition about characters:
let y = "y̆";
let mut chars = y.chars();
assert_eq!(Some('y'), chars.next()); // not 'y̆'
assert_eq!(Some('\u{0306}'), chars.next());
assert_eq!(None, chars.next());
Returns an iterator over the char
s of a string slice, and their
positions.
As a string slice consists of valid UTF-8, we can iterate through a
string slice by char
. This method returns an iterator of both
these char
s, as well as their byte positions.
The iterator yields tuples. The position is first, the char
is
second.
Examples
Basic usage:
let word = "goodbye";
let count = word.char_indices().count();
assert_eq!(7, count);
let mut char_indices = word.char_indices();
assert_eq!(Some((0, 'g')), char_indices.next());
assert_eq!(Some((1, 'o')), char_indices.next());
assert_eq!(Some((2, 'o')), char_indices.next());
assert_eq!(Some((3, 'd')), char_indices.next());
assert_eq!(Some((4, 'b')), char_indices.next());
assert_eq!(Some((5, 'y')), char_indices.next());
assert_eq!(Some((6, 'e')), char_indices.next());
assert_eq!(None, char_indices.next());
Remember, char
s might not match your intuition about characters:
let yes = "y̆es";
let mut char_indices = yes.char_indices();
assert_eq!(Some((0, 'y')), char_indices.next()); // not (0, 'y̆')
assert_eq!(Some((1, '\u{0306}')), char_indices.next());
// note the 3 here - the last character took up two bytes
assert_eq!(Some((3, 'e')), char_indices.next());
assert_eq!(Some((4, 's')), char_indices.next());
assert_eq!(None, char_indices.next());
An iterator over the bytes of a string slice.
As a string slice consists of a sequence of bytes, we can iterate through a string slice by byte. This method returns such an iterator.
Examples
Basic usage:
let mut bytes = "bors".bytes();
assert_eq!(Some(b'b'), bytes.next());
assert_eq!(Some(b'o'), bytes.next());
assert_eq!(Some(b'r'), bytes.next());
assert_eq!(Some(b's'), bytes.next());
assert_eq!(None, bytes.next());
Splits a string slice by whitespace.
The iterator returned will return string slices that are sub-slices of the original string slice, separated by any amount of whitespace.
‘Whitespace’ is defined according to the terms of the Unicode Derived
Core Property White_Space
. If you only want to split on ASCII whitespace
instead, use split_ascii_whitespace
.
Examples
Basic usage:
let mut iter = "A few words".split_whitespace();
assert_eq!(Some("A"), iter.next());
assert_eq!(Some("few"), iter.next());
assert_eq!(Some("words"), iter.next());
assert_eq!(None, iter.next());
All kinds of whitespace are considered:
let mut iter = " Mary had\ta\u{2009}little \n\t lamb".split_whitespace();
assert_eq!(Some("Mary"), iter.next());
assert_eq!(Some("had"), iter.next());
assert_eq!(Some("a"), iter.next());
assert_eq!(Some("little"), iter.next());
assert_eq!(Some("lamb"), iter.next());
assert_eq!(None, iter.next());
Splits a string slice by ASCII whitespace.
The iterator returned will return string slices that are sub-slices of the original string slice, separated by any amount of ASCII whitespace.
To split by Unicode Whitespace
instead, use split_whitespace
.
Examples
Basic usage:
let mut iter = "A few words".split_ascii_whitespace();
assert_eq!(Some("A"), iter.next());
assert_eq!(Some("few"), iter.next());
assert_eq!(Some("words"), iter.next());
assert_eq!(None, iter.next());
All kinds of ASCII whitespace are considered:
let mut iter = " Mary had\ta little \n\t lamb".split_ascii_whitespace();
assert_eq!(Some("Mary"), iter.next());
assert_eq!(Some("had"), iter.next());
assert_eq!(Some("a"), iter.next());
assert_eq!(Some("little"), iter.next());
assert_eq!(Some("lamb"), iter.next());
assert_eq!(None, iter.next());
An iterator over the lines of a string, as string slices.
Lines are ended with either a newline (\n
) or a carriage return with
a line feed (\r\n
).
The final line ending is optional. A string that ends with a final line ending will return the same lines as an otherwise identical string without a final line ending.
Examples
Basic usage:
let text = "foo\r\nbar\n\nbaz\n";
let mut lines = text.lines();
assert_eq!(Some("foo"), lines.next());
assert_eq!(Some("bar"), lines.next());
assert_eq!(Some(""), lines.next());
assert_eq!(Some("baz"), lines.next());
assert_eq!(None, lines.next());
The final line ending isn’t required:
let text = "foo\nbar\n\r\nbaz";
let mut lines = text.lines();
assert_eq!(Some("foo"), lines.next());
assert_eq!(Some("bar"), lines.next());
assert_eq!(Some(""), lines.next());
assert_eq!(Some("baz"), lines.next());
assert_eq!(None, lines.next());
👎 Deprecated since 1.4.0: use lines() instead now
use lines() instead now
An iterator over the lines of a string.
Returns an iterator of u16
over the string encoded as UTF-16.
Examples
Basic usage:
let text = "Zażółć gęślą jaźń";
let utf8_len = text.len();
let utf16_len = text.encode_utf16().count();
assert!(utf16_len <= utf8_len);
Returns true
if the given pattern matches a sub-slice of
this string slice.
Returns false
if it does not.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Examples
Basic usage:
let bananas = "bananas";
assert!(bananas.contains("nana"));
assert!(!bananas.contains("apples"));
Returns true
if the given pattern matches a prefix of this
string slice.
Returns false
if it does not.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Examples
Basic usage:
let bananas = "bananas";
assert!(bananas.starts_with("bana"));
assert!(!bananas.starts_with("nana"));
Returns true
if the given pattern matches a suffix of this
string slice.
Returns false
if it does not.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Examples
Basic usage:
let bananas = "bananas";
assert!(bananas.ends_with("anas"));
assert!(!bananas.ends_with("nana"));
Returns the byte index of the first character of this string slice that matches the pattern.
Returns None
if the pattern doesn’t match.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Examples
Simple patterns:
let s = "Löwe 老虎 Léopard Gepardi";
assert_eq!(s.find('L'), Some(0));
assert_eq!(s.find('é'), Some(14));
assert_eq!(s.find("pard"), Some(17));
More complex patterns using point-free style and closures:
let s = "Löwe 老虎 Léopard";
assert_eq!(s.find(char::is_whitespace), Some(5));
assert_eq!(s.find(char::is_lowercase), Some(1));
assert_eq!(s.find(|c: char| c.is_whitespace() || c.is_lowercase()), Some(1));
assert_eq!(s.find(|c: char| (c < 'o') && (c > 'a')), Some(4));
Not finding the pattern:
let s = "Löwe 老虎 Léopard";
let x: &[_] = &['1', '2'];
assert_eq!(s.find(x), None);
Returns the byte index for the first character of the rightmost match of the pattern in this string slice.
Returns None
if the pattern doesn’t match.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Examples
Simple patterns:
let s = "Löwe 老虎 Léopard Gepardi";
assert_eq!(s.rfind('L'), Some(13));
assert_eq!(s.rfind('é'), Some(14));
assert_eq!(s.rfind("pard"), Some(24));
More complex patterns with closures:
let s = "Löwe 老虎 Léopard";
assert_eq!(s.rfind(char::is_whitespace), Some(12));
assert_eq!(s.rfind(char::is_lowercase), Some(20));
Not finding the pattern:
let s = "Löwe 老虎 Léopard";
let x: &[_] = &['1', '2'];
assert_eq!(s.rfind(x), None);
An iterator over substrings of this string slice, separated by characters matched by a pattern.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Iterator behavior
The returned iterator will be a DoubleEndedIterator
if the pattern
allows a reverse search and forward/reverse search yields the same
elements. This is true for, e.g., char
, but not for &str
.
If the pattern allows a reverse search but its results might differ
from a forward search, the rsplit
method can be used.
Examples
Simple patterns:
let v: Vec<&str> = "Mary had a little lamb".split(' ').collect();
assert_eq!(v, ["Mary", "had", "a", "little", "lamb"]);
let v: Vec<&str> = "".split('X').collect();
assert_eq!(v, [""]);
let v: Vec<&str> = "lionXXtigerXleopard".split('X').collect();
assert_eq!(v, ["lion", "", "tiger", "leopard"]);
let v: Vec<&str> = "lion::tiger::leopard".split("::").collect();
assert_eq!(v, ["lion", "tiger", "leopard"]);
let v: Vec<&str> = "abc1def2ghi".split(char::is_numeric).collect();
assert_eq!(v, ["abc", "def", "ghi"]);
let v: Vec<&str> = "lionXtigerXleopard".split(char::is_uppercase).collect();
assert_eq!(v, ["lion", "tiger", "leopard"]);
If the pattern is a slice of chars, split on each occurrence of any of the characters:
let v: Vec<&str> = "2020-11-03 23:59".split(&['-', ' ', ':', '@'][..]).collect();
assert_eq!(v, ["2020", "11", "03", "23", "59"]);
A more complex pattern, using a closure:
let v: Vec<&str> = "abc1defXghi".split(|c| c == '1' || c == 'X').collect();
assert_eq!(v, ["abc", "def", "ghi"]);
If a string contains multiple contiguous separators, you will end up with empty strings in the output:
let x = "||||a||b|c".to_string();
let d: Vec<_> = x.split('|').collect();
assert_eq!(d, &["", "", "", "", "a", "", "b", "c"]);
Contiguous separators are separated by the empty string.
let x = "(///)".to_string();
let d: Vec<_> = x.split('/').collect();
assert_eq!(d, &["(", "", "", ")"]);
Separators at the start or end of a string are neighbored by empty strings.
let d: Vec<_> = "010".split("0").collect();
assert_eq!(d, &["", "1", ""]);
When the empty string is used as a separator, it separates every character in the string, along with the beginning and end of the string.
let f: Vec<_> = "rust".split("").collect();
assert_eq!(f, &["", "r", "u", "s", "t", ""]);
Contiguous separators can lead to possibly surprising behavior when whitespace is used as the separator. This code is correct:
let x = " a b c".to_string();
let d: Vec<_> = x.split(' ').collect();
assert_eq!(d, &["", "", "", "", "a", "", "b", "c"]);
It does not give you:
assert_eq!(d, &["a", "b", "c"]);
Use split_whitespace
for this behavior.
1.51.0[src]pub fn split_inclusive<'a, P>(&'a self, pat: P) -> SplitInclusive<'a, P> where
P: Pattern<'a>,
pub fn split_inclusive<'a, P>(&'a self, pat: P) -> SplitInclusive<'a, P> where
P: Pattern<'a>,
An iterator over substrings of this string slice, separated by
characters matched by a pattern. Differs from the iterator produced by
split
in that split_inclusive
leaves the matched part as the
terminator of the substring.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Examples
let v: Vec<&str> = "Mary had a little lamb\nlittle lamb\nlittle lamb."
.split_inclusive('\n').collect();
assert_eq!(v, ["Mary had a little lamb\n", "little lamb\n", "little lamb."]);
If the last element of the string is matched, that element will be considered the terminator of the preceding substring. That substring will be the last item returned by the iterator.
let v: Vec<&str> = "Mary had a little lamb\nlittle lamb\nlittle lamb.\n"
.split_inclusive('\n').collect();
assert_eq!(v, ["Mary had a little lamb\n", "little lamb\n", "little lamb.\n"]);
An iterator over substrings of the given string slice, separated by characters matched by a pattern and yielded in reverse order.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Iterator behavior
The returned iterator requires that the pattern supports a reverse
search, and it will be a DoubleEndedIterator
if a forward/reverse
search yields the same elements.
For iterating from the front, the split
method can be used.
Examples
Simple patterns:
let v: Vec<&str> = "Mary had a little lamb".rsplit(' ').collect();
assert_eq!(v, ["lamb", "little", "a", "had", "Mary"]);
let v: Vec<&str> = "".rsplit('X').collect();
assert_eq!(v, [""]);
let v: Vec<&str> = "lionXXtigerXleopard".rsplit('X').collect();
assert_eq!(v, ["leopard", "tiger", "", "lion"]);
let v: Vec<&str> = "lion::tiger::leopard".rsplit("::").collect();
assert_eq!(v, ["leopard", "tiger", "lion"]);
A more complex pattern, using a closure:
let v: Vec<&str> = "abc1defXghi".rsplit(|c| c == '1' || c == 'X').collect();
assert_eq!(v, ["ghi", "def", "abc"]);
1.0.0[src]pub fn split_terminator<'a, P>(&'a self, pat: P) -> SplitTerminator<'a, P> where
P: Pattern<'a>,
pub fn split_terminator<'a, P>(&'a self, pat: P) -> SplitTerminator<'a, P> where
P: Pattern<'a>,
An iterator over substrings of the given string slice, separated by characters matched by a pattern.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Equivalent to split
, except that the trailing substring
is skipped if empty.
This method can be used for string data that is terminated, rather than separated by a pattern.
Iterator behavior
The returned iterator will be a DoubleEndedIterator
if the pattern
allows a reverse search and forward/reverse search yields the same
elements. This is true for, e.g., char
, but not for &str
.
If the pattern allows a reverse search but its results might differ
from a forward search, the rsplit_terminator
method can be used.
Examples
Basic usage:
let v: Vec<&str> = "A.B.".split_terminator('.').collect();
assert_eq!(v, ["A", "B"]);
let v: Vec<&str> = "A..B..".split_terminator(".").collect();
assert_eq!(v, ["A", "", "B", ""]);
let v: Vec<&str> = "A.B:C.D".split_terminator(&['.', ':'][..]).collect();
assert_eq!(v, ["A", "B", "C", "D"]);
1.0.0[src]pub fn rsplit_terminator<'a, P>(&'a self, pat: P) -> RSplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,
pub fn rsplit_terminator<'a, P>(&'a self, pat: P) -> RSplitTerminator<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,
An iterator over substrings of self
, separated by characters
matched by a pattern and yielded in reverse order.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Equivalent to split
, except that the trailing substring is
skipped if empty.
This method can be used for string data that is terminated, rather than separated by a pattern.
Iterator behavior
The returned iterator requires that the pattern supports a reverse search, and it will be double ended if a forward/reverse search yields the same elements.
For iterating from the front, the split_terminator
method can be
used.
Examples
let v: Vec<&str> = "A.B.".rsplit_terminator('.').collect();
assert_eq!(v, ["B", "A"]);
let v: Vec<&str> = "A..B..".rsplit_terminator(".").collect();
assert_eq!(v, ["", "B", "", "A"]);
let v: Vec<&str> = "A.B:C.D".rsplit_terminator(&['.', ':'][..]).collect();
assert_eq!(v, ["D", "C", "B", "A"]);
An iterator over substrings of the given string slice, separated by a
pattern, restricted to returning at most n
items.
If n
substrings are returned, the last substring (the n
th substring)
will contain the remainder of the string.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Iterator behavior
The returned iterator will not be double ended, because it is not efficient to support.
If the pattern allows a reverse search, the rsplitn
method can be
used.
Examples
Simple patterns:
let v: Vec<&str> = "Mary had a little lambda".splitn(3, ' ').collect();
assert_eq!(v, ["Mary", "had", "a little lambda"]);
let v: Vec<&str> = "lionXXtigerXleopard".splitn(3, "X").collect();
assert_eq!(v, ["lion", "", "tigerXleopard"]);
let v: Vec<&str> = "abcXdef".splitn(1, 'X').collect();
assert_eq!(v, ["abcXdef"]);
let v: Vec<&str> = "".splitn(1, 'X').collect();
assert_eq!(v, [""]);
A more complex pattern, using a closure:
let v: Vec<&str> = "abc1defXghi".splitn(2, |c| c == '1' || c == 'X').collect();
assert_eq!(v, ["abc", "defXghi"]);
An iterator over substrings of this string slice, separated by a
pattern, starting from the end of the string, restricted to returning
at most n
items.
If n
substrings are returned, the last substring (the n
th substring)
will contain the remainder of the string.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Iterator behavior
The returned iterator will not be double ended, because it is not efficient to support.
For splitting from the front, the splitn
method can be used.
Examples
Simple patterns:
let v: Vec<&str> = "Mary had a little lamb".rsplitn(3, ' ').collect();
assert_eq!(v, ["lamb", "little", "Mary had a"]);
let v: Vec<&str> = "lionXXtigerXleopard".rsplitn(3, 'X').collect();
assert_eq!(v, ["leopard", "tiger", "lionX"]);
let v: Vec<&str> = "lion::tiger::leopard".rsplitn(2, "::").collect();
assert_eq!(v, ["leopard", "lion::tiger"]);
A more complex pattern, using a closure:
let v: Vec<&str> = "abc1defXghi".rsplitn(2, |c| c == '1' || c == 'X').collect();
assert_eq!(v, ["ghi", "abc1def"]);
Splits the string on the first occurrence of the specified delimiter and returns prefix before delimiter and suffix after delimiter.
Examples
assert_eq!("cfg".split_once('='), None);
assert_eq!("cfg=foo".split_once('='), Some(("cfg", "foo")));
assert_eq!("cfg=foo=bar".split_once('='), Some(("cfg", "foo=bar")));
Splits the string on the last occurrence of the specified delimiter and returns prefix before delimiter and suffix after delimiter.
Examples
assert_eq!("cfg".rsplit_once('='), None);
assert_eq!("cfg=foo".rsplit_once('='), Some(("cfg", "foo")));
assert_eq!("cfg=foo=bar".rsplit_once('='), Some(("cfg=foo", "bar")));
An iterator over the disjoint matches of a pattern within the given string slice.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Iterator behavior
The returned iterator will be a DoubleEndedIterator
if the pattern
allows a reverse search and forward/reverse search yields the same
elements. This is true for, e.g., char
, but not for &str
.
If the pattern allows a reverse search but its results might differ
from a forward search, the rmatches
method can be used.
Examples
Basic usage:
let v: Vec<&str> = "abcXXXabcYYYabc".matches("abc").collect();
assert_eq!(v, ["abc", "abc", "abc"]);
let v: Vec<&str> = "1abc2abc3".matches(char::is_numeric).collect();
assert_eq!(v, ["1", "2", "3"]);
An iterator over the disjoint matches of a pattern within this string slice, yielded in reverse order.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Iterator behavior
The returned iterator requires that the pattern supports a reverse
search, and it will be a DoubleEndedIterator
if a forward/reverse
search yields the same elements.
For iterating from the front, the matches
method can be used.
Examples
Basic usage:
let v: Vec<&str> = "abcXXXabcYYYabc".rmatches("abc").collect();
assert_eq!(v, ["abc", "abc", "abc"]);
let v: Vec<&str> = "1abc2abc3".rmatches(char::is_numeric).collect();
assert_eq!(v, ["3", "2", "1"]);
1.5.0[src]pub fn match_indices<'a, P>(&'a self, pat: P) -> MatchIndices<'a, P> where
P: Pattern<'a>,
pub fn match_indices<'a, P>(&'a self, pat: P) -> MatchIndices<'a, P> where
P: Pattern<'a>,
An iterator over the disjoint matches of a pattern within this string slice as well as the index that the match starts at.
For matches of pat
within self
that overlap, only the indices
corresponding to the first match are returned.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Iterator behavior
The returned iterator will be a DoubleEndedIterator
if the pattern
allows a reverse search and forward/reverse search yields the same
elements. This is true for, e.g., char
, but not for &str
.
If the pattern allows a reverse search but its results might differ
from a forward search, the rmatch_indices
method can be used.
Examples
Basic usage:
let v: Vec<_> = "abcXXXabcYYYabc".match_indices("abc").collect();
assert_eq!(v, [(0, "abc"), (6, "abc"), (12, "abc")]);
let v: Vec<_> = "1abcabc2".match_indices("abc").collect();
assert_eq!(v, [(1, "abc"), (4, "abc")]);
let v: Vec<_> = "ababa".match_indices("aba").collect();
assert_eq!(v, [(0, "aba")]); // only the first `aba`
1.5.0[src]pub fn rmatch_indices<'a, P>(&'a self, pat: P) -> RMatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,
pub fn rmatch_indices<'a, P>(&'a self, pat: P) -> RMatchIndices<'a, P> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,
An iterator over the disjoint matches of a pattern within self
,
yielded in reverse order along with the index of the match.
For matches of pat
within self
that overlap, only the indices
corresponding to the last match are returned.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Iterator behavior
The returned iterator requires that the pattern supports a reverse
search, and it will be a DoubleEndedIterator
if a forward/reverse
search yields the same elements.
For iterating from the front, the match_indices
method can be used.
Examples
Basic usage:
let v: Vec<_> = "abcXXXabcYYYabc".rmatch_indices("abc").collect();
assert_eq!(v, [(12, "abc"), (6, "abc"), (0, "abc")]);
let v: Vec<_> = "1abcabc2".rmatch_indices("abc").collect();
assert_eq!(v, [(4, "abc"), (1, "abc")]);
let v: Vec<_> = "ababa".rmatch_indices("aba").collect();
assert_eq!(v, [(2, "aba")]); // only the last `aba`
Returns a string slice with leading and trailing whitespace removed.
‘Whitespace’ is defined according to the terms of the Unicode Derived
Core Property White_Space
.
Examples
Basic usage:
let s = " Hello\tworld\t";
assert_eq!("Hello\tworld", s.trim());
Returns a string slice with leading whitespace removed.
‘Whitespace’ is defined according to the terms of the Unicode Derived
Core Property White_Space
.
Text directionality
A string is a sequence of bytes. start
in this context means the first
position of that byte string; for a left-to-right language like English or
Russian, this will be left side, and for right-to-left languages like
Arabic or Hebrew, this will be the right side.
Examples
Basic usage:
let s = " Hello\tworld\t";
assert_eq!("Hello\tworld\t", s.trim_start());
Directionality:
let s = " English ";
assert!(Some('E') == s.trim_start().chars().next());
let s = " עברית ";
assert!(Some('ע') == s.trim_start().chars().next());
Returns a string slice with trailing whitespace removed.
‘Whitespace’ is defined according to the terms of the Unicode Derived
Core Property White_Space
.
Text directionality
A string is a sequence of bytes. end
in this context means the last
position of that byte string; for a left-to-right language like English or
Russian, this will be right side, and for right-to-left languages like
Arabic or Hebrew, this will be the left side.
Examples
Basic usage:
let s = " Hello\tworld\t";
assert_eq!(" Hello\tworld", s.trim_end());
Directionality:
let s = " English ";
assert!(Some('h') == s.trim_end().chars().rev().next());
let s = " עברית ";
assert!(Some('ת') == s.trim_end().chars().rev().next());
👎 Deprecated since 1.33.0: superseded by trim_start
superseded by trim_start
Returns a string slice with leading whitespace removed.
‘Whitespace’ is defined according to the terms of the Unicode Derived
Core Property White_Space
.
Text directionality
A string is a sequence of bytes. ‘Left’ in this context means the first position of that byte string; for a language like Arabic or Hebrew which are ‘right to left’ rather than ‘left to right’, this will be the right side, not the left.
Examples
Basic usage:
let s = " Hello\tworld\t";
assert_eq!("Hello\tworld\t", s.trim_left());
Directionality:
let s = " English";
assert!(Some('E') == s.trim_left().chars().next());
let s = " עברית";
assert!(Some('ע') == s.trim_left().chars().next());
👎 Deprecated since 1.33.0: superseded by trim_end
superseded by trim_end
Returns a string slice with trailing whitespace removed.
‘Whitespace’ is defined according to the terms of the Unicode Derived
Core Property White_Space
.
Text directionality
A string is a sequence of bytes. ‘Right’ in this context means the last position of that byte string; for a language like Arabic or Hebrew which are ‘right to left’ rather than ‘left to right’, this will be the left side, not the right.
Examples
Basic usage:
let s = " Hello\tworld\t";
assert_eq!(" Hello\tworld", s.trim_right());
Directionality:
let s = "English ";
assert!(Some('h') == s.trim_right().chars().rev().next());
let s = "עברית ";
assert!(Some('ת') == s.trim_right().chars().rev().next());
1.0.0[src]pub fn trim_matches<'a, P>(&'a self, pat: P) -> &'a str where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: DoubleEndedSearcher<'a>,
pub fn trim_matches<'a, P>(&'a self, pat: P) -> &'a str where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: DoubleEndedSearcher<'a>,
Returns a string slice with all prefixes and suffixes that match a pattern repeatedly removed.
The pattern can be a char
, a slice of char
s, or a function
or closure that determines if a character matches.
Examples
Simple patterns:
assert_eq!("11foo1bar11".trim_matches('1'), "foo1bar");
assert_eq!("123foo1bar123".trim_matches(char::is_numeric), "foo1bar");
let x: &[_] = &['1', '2'];
assert_eq!("12foo1bar12".trim_matches(x), "foo1bar");
A more complex pattern, using a closure:
assert_eq!("1foo1barXX".trim_matches(|c| c == '1' || c == 'X'), "foo1bar");
Returns a string slice with all prefixes that match a pattern repeatedly removed.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Text directionality
A string is a sequence of bytes. start
in this context means the first
position of that byte string; for a left-to-right language like English or
Russian, this will be left side, and for right-to-left languages like
Arabic or Hebrew, this will be the right side.
Examples
Basic usage:
assert_eq!("11foo1bar11".trim_start_matches('1'), "foo1bar11");
assert_eq!("123foo1bar123".trim_start_matches(char::is_numeric), "foo1bar123");
let x: &[_] = &['1', '2'];
assert_eq!("12foo1bar12".trim_start_matches(x), "foo1bar12");
Returns a string slice with the prefix removed.
If the string starts with the pattern prefix
, returns substring after the prefix, wrapped
in Some
. Unlike trim_start_matches
, this method removes the prefix exactly once.
If the string does not start with prefix
, returns None
.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Examples
assert_eq!("foo:bar".strip_prefix("foo:"), Some("bar"));
assert_eq!("foo:bar".strip_prefix("bar"), None);
assert_eq!("foofoo".strip_prefix("foo"), Some("foo"));
1.45.0[src]pub fn strip_suffix<'a, P>(&'a self, suffix: P) -> Option<&'a str> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,
pub fn strip_suffix<'a, P>(&'a self, suffix: P) -> Option<&'a str> where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,
Returns a string slice with the suffix removed.
If the string ends with the pattern suffix
, returns the substring before the suffix,
wrapped in Some
. Unlike trim_end_matches
, this method removes the suffix exactly once.
If the string does not end with suffix
, returns None
.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Examples
assert_eq!("bar:foo".strip_suffix(":foo"), Some("bar"));
assert_eq!("bar:foo".strip_suffix("bar"), None);
assert_eq!("foofoo".strip_suffix("foo"), Some("foo"));
1.30.0[src]pub fn trim_end_matches<'a, P>(&'a self, pat: P) -> &'a str where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,
pub fn trim_end_matches<'a, P>(&'a self, pat: P) -> &'a str where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,
Returns a string slice with all suffixes that match a pattern repeatedly removed.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Text directionality
A string is a sequence of bytes. end
in this context means the last
position of that byte string; for a left-to-right language like English or
Russian, this will be right side, and for right-to-left languages like
Arabic or Hebrew, this will be the left side.
Examples
Simple patterns:
assert_eq!("11foo1bar11".trim_end_matches('1'), "11foo1bar");
assert_eq!("123foo1bar123".trim_end_matches(char::is_numeric), "123foo1bar");
let x: &[_] = &['1', '2'];
assert_eq!("12foo1bar12".trim_end_matches(x), "12foo1bar");
A more complex pattern, using a closure:
assert_eq!("1fooX".trim_end_matches(|c| c == '1' || c == 'X'), "1foo");
👎 Deprecated since 1.33.0: superseded by trim_start_matches
superseded by trim_start_matches
Returns a string slice with all prefixes that match a pattern repeatedly removed.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Text directionality
A string is a sequence of bytes. ‘Left’ in this context means the first position of that byte string; for a language like Arabic or Hebrew which are ‘right to left’ rather than ‘left to right’, this will be the right side, not the left.
Examples
Basic usage:
assert_eq!("11foo1bar11".trim_left_matches('1'), "foo1bar11");
assert_eq!("123foo1bar123".trim_left_matches(char::is_numeric), "foo1bar123");
let x: &[_] = &['1', '2'];
assert_eq!("12foo1bar12".trim_left_matches(x), "foo1bar12");
1.0.0[src]pub fn trim_right_matches<'a, P>(&'a self, pat: P) -> &'a str where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,
👎 Deprecated since 1.33.0: superseded by trim_end_matches
pub fn trim_right_matches<'a, P>(&'a self, pat: P) -> &'a str where
P: Pattern<'a>,
<P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,
superseded by trim_end_matches
Returns a string slice with all suffixes that match a pattern repeatedly removed.
The pattern can be a &str
, char
, a slice of char
s, or a
function or closure that determines if a character matches.
Text directionality
A string is a sequence of bytes. ‘Right’ in this context means the last position of that byte string; for a language like Arabic or Hebrew which are ‘right to left’ rather than ‘left to right’, this will be the left side, not the right.
Examples
Simple patterns:
assert_eq!("11foo1bar11".trim_right_matches('1'), "11foo1bar");
assert_eq!("123foo1bar123".trim_right_matches(char::is_numeric), "123foo1bar");
let x: &[_] = &['1', '2'];
assert_eq!("12foo1bar12".trim_right_matches(x), "12foo1bar");
A more complex pattern, using a closure:
assert_eq!("1fooX".trim_right_matches(|c| c == '1' || c == 'X'), "1foo");
Parses this string slice into another type.
Because parse
is so general, it can cause problems with type
inference. As such, parse
is one of the few times you’ll see
the syntax affectionately known as the ‘turbofish’: ::<>
. This
helps the inference algorithm understand specifically which type
you’re trying to parse into.
parse
can parse into any type that implements the FromStr
trait.
Errors
Will return Err
if it’s not possible to parse this string slice into
the desired type.
Examples
Basic usage
let four: u32 = "4".parse().unwrap();
assert_eq!(4, four);
Using the ‘turbofish’ instead of annotating four
:
let four = "4".parse::<u32>();
assert_eq!(Ok(4), four);
Failing to parse:
let nope = "j".parse::<u32>();
assert!(nope.is_err());
Checks if all characters in this string are within the ASCII range.
Examples
let ascii = "hello!\n";
let non_ascii = "Grüße, Jürgen ❤";
assert!(ascii.is_ascii());
assert!(!non_ascii.is_ascii());
Checks that two strings are an ASCII case-insensitive match.
Same as to_ascii_lowercase(a) == to_ascii_lowercase(b)
,
but without allocating and copying temporaries.
Examples
assert!("Ferris".eq_ignore_ascii_case("FERRIS"));
assert!("Ferrös".eq_ignore_ascii_case("FERRöS"));
assert!(!"Ferrös".eq_ignore_ascii_case("FERRÖS"));
Converts this string to its ASCII upper case equivalent in-place.
ASCII letters ‘a’ to ‘z’ are mapped to ‘A’ to ‘Z’, but non-ASCII letters are unchanged.
To return a new uppercased value without modifying the existing one, use
to_ascii_uppercase()
.
Examples
let mut s = String::from("Grüße, Jürgen ❤");
s.make_ascii_uppercase();
assert_eq!("GRüßE, JüRGEN ❤", s);
Converts this string to its ASCII lower case equivalent in-place.
ASCII letters ‘A’ to ‘Z’ are mapped to ‘a’ to ‘z’, but non-ASCII letters are unchanged.
To return a new lowercased value without modifying the existing one, use
to_ascii_lowercase()
.
Examples
let mut s = String::from("GRÜßE, JÜRGEN ❤");
s.make_ascii_lowercase();
assert_eq!("grÜße, jÜrgen ❤", s);
Return an iterator that escapes each char in self
with char::escape_debug
.
Note: only extended grapheme codepoints that begin the string will be escaped.
Examples
As an iterator:
for c in "❤\n!".escape_debug() {
print!("{}", c);
}
println!();
Using println!
directly:
println!("{}", "❤\n!".escape_debug());
Both are equivalent to:
println!("❤\\n!");
Using to_string
:
assert_eq!("❤\n!".escape_debug().to_string(), "❤\\n!");
Return an iterator that escapes each char in self
with char::escape_default
.
Examples
As an iterator:
for c in "❤\n!".escape_default() {
print!("{}", c);
}
println!();
Using println!
directly:
println!("{}", "❤\n!".escape_default());
Both are equivalent to:
println!("\\u{{2764}}\\n!");
Using to_string
:
assert_eq!("❤\n!".escape_default().to_string(), "\\u{2764}\\n!");
Return an iterator that escapes each char in self
with char::escape_unicode
.
Examples
As an iterator:
for c in "❤\n!".escape_unicode() {
print!("{}", c);
}
println!();
Using println!
directly:
println!("{}", "❤\n!".escape_unicode());
Both are equivalent to:
println!("\\u{{2764}}\\u{{a}}\\u{{21}}");
Using to_string
:
assert_eq!("❤\n!".escape_unicode().to_string(), "\\u{2764}\\u{a}\\u{21}");
Replaces all matches of a pattern with another string.
replace
creates a new String
, and copies the data from this string slice into it.
While doing so, it attempts to find matches of a pattern. If it finds any, it
replaces them with the replacement string slice.
Examples
Basic usage:
let s = "this is old";
assert_eq!("this is new", s.replace("old", "new"));
When the pattern doesn’t match:
let s = "this is old";
assert_eq!(s, s.replace("cookie monster", "little lamb"));
Replaces first N matches of a pattern with another string.
replacen
creates a new String
, and copies the data from this string slice into it.
While doing so, it attempts to find matches of a pattern. If it finds any, it
replaces them with the replacement string slice at most count
times.
Examples
Basic usage:
let s = "foo foo 123 foo";
assert_eq!("new new 123 foo", s.replacen("foo", "new", 2));
assert_eq!("faa fao 123 foo", s.replacen('o', "a", 3));
assert_eq!("foo foo new23 foo", s.replacen(char::is_numeric, "new", 1));
When the pattern doesn’t match:
let s = "this is old";
assert_eq!(s, s.replacen("cookie monster", "little lamb", 10));
Returns the lowercase equivalent of this string slice, as a new String
.
‘Lowercase’ is defined according to the terms of the Unicode Derived Core Property
Lowercase
.
Since some characters can expand into multiple characters when changing
the case, this function returns a String
instead of modifying the
parameter in-place.
Examples
Basic usage:
let s = "HELLO";
assert_eq!("hello", s.to_lowercase());
A tricky example, with sigma:
let sigma = "Σ";
assert_eq!("σ", sigma.to_lowercase());
// but at the end of a word, it's ς, not σ:
let odysseus = "ὈΔΥΣΣΕΎΣ";
assert_eq!("ὀδυσσεύς", odysseus.to_lowercase());
Languages without case are not changed:
let new_year = "农历新年";
assert_eq!(new_year, new_year.to_lowercase());
Returns the uppercase equivalent of this string slice, as a new String
.
‘Uppercase’ is defined according to the terms of the Unicode Derived Core Property
Uppercase
.
Since some characters can expand into multiple characters when changing
the case, this function returns a String
instead of modifying the
parameter in-place.
Examples
Basic usage:
let s = "hello";
assert_eq!("HELLO", s.to_uppercase());
Scripts without case are not changed:
let new_year = "农历新年";
assert_eq!(new_year, new_year.to_uppercase());
One character can become multiple:
let s = "tschüß";
assert_eq!("TSCHÜSS", s.to_uppercase());
Creates a new String
by repeating a string n
times.
Panics
This function will panic if the capacity would overflow.
Examples
Basic usage:
assert_eq!("abc".repeat(4), String::from("abcabcabcabc"));
A panic upon overflow:
// this will panic at runtime
let huge = "0123456789abcdef".repeat(usize::MAX);
Returns a copy of this string where each character is mapped to its ASCII upper case equivalent.
ASCII letters ‘a’ to ‘z’ are mapped to ‘A’ to ‘Z’, but non-ASCII letters are unchanged.
To uppercase the value in-place, use make_ascii_uppercase
.
To uppercase ASCII characters in addition to non-ASCII characters, use
to_uppercase
.
Examples
let s = "Grüße, Jürgen ❤";
assert_eq!("GRüßE, JüRGEN ❤", s.to_ascii_uppercase());
Returns a copy of this string where each character is mapped to its ASCII lower case equivalent.
ASCII letters ‘A’ to ‘Z’ are mapped to ‘a’ to ‘z’, but non-ASCII letters are unchanged.
To lowercase the value in-place, use make_ascii_lowercase
.
To lowercase ASCII characters in addition to non-ASCII characters, use
to_lowercase
.
Examples
let s = "Grüße, Jürgen ❤";
assert_eq!("grüße, jürgen ❤", s.to_ascii_lowercase());
Trait Implementations
Performs the +=
operation. Read more
Mutably borrows from an owned value. Read more
impl<'de, const N: usize> Deserialize<'de> for StaticString<N>
This is supported on crate feature serde
only.
impl<'de, const N: usize> Deserialize<'de> for StaticString<N>
serde
only.Deserialize this value from the given Serde deserializer. Read more
Extends a collection with the contents of an iterator. Read more
extend_one
)Extends a collection with exactly one element.
extend_one
)Reserves capacity in a collection for the given number of additional elements. Read more
Extends a collection with the contents of an iterator. Read more
extend_one
)Extends a collection with exactly one element.
extend_one
)Reserves capacity in a collection for the given number of additional elements. Read more
Extends a collection with the contents of an iterator. Read more
extend_one
)Extends a collection with exactly one element.
extend_one
)Reserves capacity in a collection for the given number of additional elements. Read more
Performs the conversion.
Performs the conversion.
Creates a value from an iterator. Read more
Creates a value from an iterator. Read more
Creates a value from an iterator. Read more
impl<const N: usize> PartialEq<String> for StaticString<N>
This is supported on crate feature std
only.
impl<const N: usize> PartialEq<String> for StaticString<N>
std
only.This method returns an ordering between self
and other
values if one exists. Read more
This method tests less than (for self
and other
) and is used by the <
operator. Read more
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
This method returns an ordering between self
and other
values if one exists. Read more
This method tests less than (for self
and other
) and is used by the <
operator. Read more
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
impl<const N: usize> PartialOrd<String> for StaticString<N>
This is supported on crate feature std
only.
impl<const N: usize> PartialOrd<String> for StaticString<N>
std
only.This method returns an ordering between self
and other
values if one exists. Read more
This method tests less than (for self
and other
) and is used by the <
operator. Read more
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
This method returns an ordering between self
and other
values if one exists. Read more
This method tests less than (for self
and other
) and is used by the <
operator. Read more
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
Writes a string slice into this writer, returning whether the write succeeded. Read more
Auto Trait Implementations
impl<const N: usize> RefUnwindSafe for StaticString<N>
impl<const N: usize> Send for StaticString<N>
impl<const N: usize> Sync for StaticString<N>
impl<const N: usize> Unpin for StaticString<N>
impl<const N: usize> UnwindSafe for StaticString<N>
Blanket Implementations
Mutably borrows from an owned value. Read more