[−][src]Struct tinyvec_string::tinystring::TinyString
alloc
only.A UTF-8 encoded, fixed-capacity string.
An TinyString
is similar to String
, but is backed by an
TinyVec
instead of a Vec
. This means it has similar
characteristics to TinyVec
:
- An
TinyString
has a fixed capacity (in bytes), the size of the backing array. - An
TinyString
has a dynamic length; characters can be added and removed. Attempting to add characters when the capacity has been reached will cause a panic.
Like String
, the contents of an TinyString
must be valid UTF-8 at all
times.
TinyString
is intended to replicate the API of String
as much as
possible.
Requires the alloc
cargo feature to be enabled.
Implementations
impl<A: ByteArray> TinyString<A>
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pub fn new() -> TinyString<A>
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Creates a new empty TinyString
.
This creates a new TinyVec
with a backing array of zeroes.
Examples
// create an `TinyString` with 16 bytes of capacity let s = TinyString::<[u8; 16]>::new();
pub fn from_utf8(vec: TinyVec<A>) -> Result<TinyString<A>, FromUtf8Error<A>>
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Converts a vector of bytes to an TinyString
.
TinyString
is backed by TinyVec
, so after ensuring valid UTF-8,
this function simply constructs an TinyString
containing the
provided TinyVec
.
The inverse of this method is into_bytes
.
Errors
Returns Err
if the slice is not UTF-8 with a description as to why the
provided bytes are not UTF-8. The vector you moved in is also included.
Examples
use tinyvec::{tiny_vec, TinyVec}; // some bytes, in a vector let ferris: TinyVec<[u8; 7]> = tiny_vec![240, 159, 166, 128, 226, 153, 165]; // We know these bytes are valid UTF-8, so we'll use `unwrap()`. let ferris = TinyString::from_utf8(ferris).unwrap(); assert_eq!("🦀♥", ferris);
Incorrect bytes:
use tinyvec::{tiny_vec, TinyVec}; // some invalid bytes, in a vector let ferris: TinyVec<[u8; 7]> = tiny_vec![0, 159, 166, 128, 226, 153, 165]; assert!(TinyString::from_utf8(ferris).is_err());
See the docs for FromUtf8Error
for more details on what you can do
with this error.
pub unsafe fn from_utf8_unchecked(vec: TinyVec<A>) -> TinyString<A>
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Converts a vector of bytes to an TinyString
without checking that
the string contains valid UTF-8.
See the safe version, from_utf8
, for more details.
Safety
This function is unsafe because it does not check that the bytes passed
to it are valid UTF-8. If this constraint is violated, it may cause
memory unsafety issues with future users of the TinyString
, as the
rest of this library and the standard library assumes that str
s are
valid UTF-8.
Examples
use tinyvec::{tiny_vec, TinyVec}; // some bytes, in a vector let ferris: TinyVec<[u8; 7]> = tiny_vec![240, 159, 166, 128, 226, 153, 165]; let ferris = unsafe { // we know these bytes are valid UTF-8, so this is sound. TinyString::from_utf8_unchecked(ferris) }; assert_eq!("🦀♥", ferris);
pub fn into_bytes(self) -> TinyVec<A>
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Returns an TinyString
's backing TinyVec
.
Examples
use std::convert::TryFrom; let s = TinyString::<[u8; 5]>::try_from("hello").unwrap(); let bytes = s.into_bytes(); assert_eq!(&[104, 101, 108, 108, 111][..], &bytes[..]);
pub fn as_str(&self) -> &str
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Extracts a string slice containing the entire TinyString
.
Examples
use std::convert::TryFrom; let s = TinyString::<[u8; 3]>::try_from("foo").unwrap(); assert_eq!("foo", s.as_str());
pub fn as_mut_str(&mut self) -> &mut str
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Extracts a mutable string slice containing the entire TinyString
.
Examples
use std::convert::TryFrom; let mut s = TinyString::<[u8; 6]>::try_from("foobar").unwrap(); let s_mut_str = s.as_mut_str(); s_mut_str.make_ascii_uppercase(); assert_eq!("FOOBAR", s_mut_str);
pub fn as_bytes(&self) -> &[u8]ⓘ
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Returns a byte slice of this TinyString
's contents.
The inverse of this method is from_utf8
.
Examples
use std::convert::TryFrom; let s = TinyString::<[u8; 5]>::try_from("hello").unwrap(); assert_eq!(&[104, 101, 108, 108, 111], s.as_bytes());
pub unsafe fn as_mut_vec(&mut self) -> &mut TinyVec<A>
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Returns a mutable reference to the contents of this TinyString
.
Safety
This function is unsafe because it does not check that the bytes passed
to it are valid UTF-8. If this constraint is violated, it may cause
memory unsafety issues with future users of the TinyString
, as the
rest of the standard library assumes that TinyString
s are valid
UTF-8.
Examples
use std::convert::TryFrom; let mut s = TinyString::<[u8; 5]>::try_from("hello").unwrap(); unsafe { let vec = s.as_mut_vec(); assert_eq!(&[104, 101, 108, 108, 111][..], &vec[..]); vec.reverse(); } assert_eq!(s, "olleh");
pub fn capacity(&self) -> usize
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Returns this TinyString
's capacity, in bytes.
This always returns a constant, the size of the backing array.
Examples
let s = TinyString::<[u8; 16]>::new(); assert!(s.capacity() == 16);
pub fn len(&self) -> usize
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Returns the length of this TinyString
, in bytes, not char
s or
graphemes. In other words, it may not be what a human considers the
length of the string.
Examples
use std::convert::TryFrom; let plain_f = TinyString::<[u8; 3]>::try_from("foo").unwrap(); assert_eq!(plain_f.len(), 3); let fancy_f = TinyString::<[u8; 4]>::try_from("ƒoo").unwrap(); assert_eq!(fancy_f.len(), 4); assert_eq!(fancy_f.chars().count(), 3); let s = TinyString::<[u8; 16]>::try_from("hello").unwrap(); assert_eq!(s.len(), 5);
pub fn is_empty(&self) -> bool
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Returns true
if this TinyString
has a length of zero, and false
otherwise.
Examples
let mut s = TinyString::<[u8; 5]>::new(); assert!(s.is_empty()); s.push('a'); assert!(!s.is_empty());
pub fn push_str(&mut self, string: &str)
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Appends a given string slice onto the end of this TinyString
.
Examples
use std::convert::TryFrom; let mut s = TinyString::<[u8; 6]>::try_from("foo").unwrap(); s.push_str("bar"); assert_eq!("foobar", s);
pub fn push(&mut self, ch: char)
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Appends the given char
to the end of this String
.
Examples
use std::convert::TryFrom; let mut s = TinyString::<[u8; 6]>::try_from("abc").unwrap(); s.push('1'); s.push('2'); s.push('3'); assert_eq!("abc123", s);
pub fn truncate(&mut self, new_len: usize)
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Shortens this TinyString
to the specified length.
If new_len
is greater than the string's current length, this has no
effect.
Note that this method has no effect on the maximum capacity of the string
Panics
Panics if new_len
does not lie on a char
boundary.
Examples
use std::convert::TryFrom; let mut s = TinyString::<[u8; 5]>::try_from("hello").unwrap(); s.truncate(2); assert_eq!("he", s);
pub fn pop(&mut self) -> Option<char>
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Removes the last character from the string buffer and returns it.
Returns None
if this String
is empty.
Examples
use std::convert::TryFrom; let mut s = TinyString::<[u8; 3]>::try_from("foo").unwrap(); assert_eq!(s.pop(), Some('o')); assert_eq!(s.pop(), Some('o')); assert_eq!(s.pop(), Some('f')); assert_eq!(s.pop(), None);
pub fn remove(&mut self, idx: usize) -> char
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Removes a char
from this String
at a byte position and returns it.
This is an O(n)
operation, as it requires copying every element in the
buffer.
Panics
Panics if idx
is larger than or equal to the TinyString
's length,
or if it does not lie on a char
boundary.
Examples
use std::convert::TryFrom; let mut s = TinyString::<[u8; 3]>::try_from("foo").unwrap(); assert_eq!(s.remove(0), 'f'); assert_eq!(s.remove(1), 'o'); assert_eq!(s.remove(0), 'o');
pub fn retain<F>(&mut self, f: F) where
F: FnMut(char) -> bool,
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F: FnMut(char) -> bool,
Retains only the characters specified by the predicate.
In other words, remove all characters c
such that f(c)
returns false
.
This method operates in place, visiting each character exactly once in the
original order, and preserves the order of the retained characters.
Examples
use std::convert::TryFrom; let mut s = TinyString::<[u8; 9]>::try_from("f_o_ob_ar").unwrap(); s.retain(|c| c != '_'); assert_eq!(s, "foobar");
The exact order may be useful for tracking external state, like an index.
use std::convert::TryFrom; let mut s = TinyString::<[u8; 5]>::try_from("abcde").unwrap(); let keep = [false, true, true, false, true]; let mut i = 0; s.retain(|_| (keep[i], i += 1).0); assert_eq!(s, "bce");
pub fn insert(&mut self, idx: usize, ch: char)
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Inserts a character into this TinyString
at a byte position.
This is an O(n)
operation as it requires copying every element in the
buffer.
Panics
Panics if idx
is larger than the TinyString
's length, or if it does not
lie on a char
boundary.
Examples
let mut s = TinyString::<[u8; 3]>::new(); s.insert(0, 'f'); s.insert(1, 'o'); s.insert(2, 'o'); assert_eq!("foo", s);
pub fn insert_str(&mut self, idx: usize, string: &str)
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Inserts a string slice into this TinyString
at a byte position.
This is an O(n)
operation as it requires copying every element in the
buffer.
Panics
Panics if idx
is larger than the String
's length, or if it does not
lie on a char
boundary.
Examples
use std::convert::TryFrom; let mut s = TinyString::<[u8; 6]>::try_from("bar").unwrap(); s.insert_str(0, "foo"); assert_eq!("foobar", s);
pub fn clear(&mut self)
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Truncates this TinyString
, removing all contents.
While this means the TinyString
will have a length of zero, it does
not modify its capacity.
Examples
use std::convert::TryFrom; let mut s = TinyString::<[u8; 3]>::try_from("foo").unwrap(); s.clear(); assert!(s.is_empty()); assert_eq!(0, s.len()); assert_eq!(3, s.capacity());
pub fn drain<R>(&mut self, range: R) -> Drain<'_, A>ⓘ where
R: RangeBounds<usize>,
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R: RangeBounds<usize>,
Creates a draining iterator that removes the specified range in the
TinyString
and yields the removed chars
.
Note: The element range is removed even if the iterator is not consumed until the end.
Panics
Panics if the starting point or end point do not lie on a char
boundary, or if they're out of bounds.
Examples
use std::convert::TryFrom; let mut s = TinyString::<[u8; 23]>::try_from("α is alpha, β is beta").unwrap(); let beta_offset = s.find('β').unwrap_or(s.len()); // Remove the range up until the β from the string let t: TinyString<[u8; 23]> = s.drain(..beta_offset).collect(); assert_eq!(t, "α is alpha, "); assert_eq!(s, "β is beta"); // A full range clears the string s.drain(..); assert_eq!(s, "");
pub fn move_to_the_heap(&mut self)
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pub fn replace_range<R>(&mut self, range: R, replace_with: &str) where
R: RangeBounds<usize>,
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R: RangeBounds<usize>,
Removes the specified range in the string, and replaces it with the given string. The given string doesn't need to be the same length as the range.
Panics
Panics if the starting point or end point do not lie on a char
boundary, or if they're out of bounds.
Examples
Basic usage:
let mut s = TinyString::<[u8; 32]>::from("α is alpha, β is beta"); let beta_offset = s.find('β').unwrap_or(s.len()); // Replace the range up until the β from the string s.replace_range(..beta_offset, "Α is capital alpha; "); assert_eq!(s, "Α is capital alpha; β is beta");
#[must_use = "use `.truncate()` if you don't need the other half"]pub fn split_off(&mut self, at: usize) -> TinyString<A>
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Splits the string into two at the given index.
Returns a new TinyString
. self
contains bytes [0, at)
, and
the returned TinyString
contains bytes [at, len)
. at
must be on
the boundary of a UTF-8 code point.
Both self
and the returned TinyString
will have the same capacity
as self
did before this was called.
Panics
Panics if at
is not on a UTF-8
code point boundary, or if it is beyond the last
code point of the string.
Examples
use std::convert::TryFrom; let mut hello = TinyString::<[u8; 13]>::try_from("Hello, World!").unwrap(); let world = hello.split_off(7); assert_eq!(hello, "Hello, "); assert_eq!(world, "World!");
Trait Implementations
impl<A: ByteArray> Add<&'_ str> for TinyString<A>
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Implements the +
operator for concatenating two strings.
Examples
use std::convert::TryFrom; let a = TinyString::<[u8; 13]>::try_from("Hello, ").unwrap(); let b = "World!"; let c = a + b; assert_eq!(c, "Hello, World!");
type Output = TinyString<A>
The resulting type after applying the +
operator.
pub fn add(self, other: &str) -> Self
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impl<A: ByteArray> AddAssign<&'_ str> for TinyString<A>
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Implements the +=
operator for appending to a String
.
This has the same behavior as the push_str
method.
Examples
use std::convert::TryFrom; let mut a = TinyString::<[u8; 13]>::try_from("Hello, ").unwrap(); let b = "World!"; a += b; assert_eq!(a, "Hello, World!");
pub fn add_assign(&mut self, other: &str)
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impl<A: ByteArray> AsMut<str> for TinyString<A>
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impl<A: ByteArray> AsRef<[u8]> for TinyString<A>
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impl<A: ByteArray> AsRef<str> for TinyString<A>
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impl<A: ByteArray + Clone> Clone for TinyString<A>
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pub fn clone(&self) -> Self
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pub fn clone_from(&mut self, source: &Self)
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impl<A: ByteArray> Debug for TinyString<A>
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impl<A: ByteArray> Default for TinyString<A>
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impl<A: ByteArray> Deref for TinyString<A>
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impl<A: ByteArray> DerefMut for TinyString<A>
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impl<A: ByteArray> Display for TinyString<A>
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impl<A: Eq + ByteArray> Eq for TinyString<A>
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impl<'a, A: ByteArray> Extend<&'a char> for TinyString<A>
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pub fn extend<I: IntoIterator<Item = &'a char>>(&mut self, iter: I)
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pub fn extend_one(&mut self, item: A)
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pub fn extend_reserve(&mut self, additional: usize)
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impl<'a, A: ByteArray> Extend<&'a str> for TinyString<A>
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pub fn extend<I: IntoIterator<Item = &'a str>>(&mut self, iter: I)
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pub fn extend_one(&mut self, item: A)
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pub fn extend_reserve(&mut self, additional: usize)
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impl<'a, A: ByteArray> Extend<Cow<'a, str>> for TinyString<A>
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pub fn extend<I: IntoIterator<Item = Cow<'a, str>>>(&mut self, iter: I)
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pub fn extend_one(&mut self, item: A)
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pub fn extend_reserve(&mut self, additional: usize)
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impl<A: ByteArray> Extend<String> for TinyString<A>
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pub fn extend<I: IntoIterator<Item = String>>(&mut self, iter: I)
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pub fn extend_one(&mut self, item: A)
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pub fn extend_reserve(&mut self, additional: usize)
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impl<A: ByteArray, A2: ByteArray> Extend<TinyString<A2>> for TinyString<A>
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pub fn extend<I: IntoIterator<Item = TinyString<A2>>>(&mut self, iter: I)
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pub fn extend_one(&mut self, item: A)
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pub fn extend_reserve(&mut self, additional: usize)
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impl<A: ByteArray> Extend<char> for TinyString<A>
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pub fn extend<I: IntoIterator<Item = char>>(&mut self, iter: I)
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pub fn extend_one(&mut self, item: A)
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pub fn extend_reserve(&mut self, additional: usize)
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impl<'a, A: ByteArray> From<&'a String> for TinyString<A>
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impl<'a, A: ByteArray> From<&'a char> for TinyString<A>
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impl<'a, A: ByteArray> From<&'a mut str> for TinyString<A>
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impl<'a, A: ByteArray> From<&'a str> for TinyString<A>
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impl<'a, A: ByteArray> From<Cow<'a, str>> for TinyString<A>
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pub fn from(s: Cow<'a, str>) -> Self
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If the Cow
is Owned
, then the String
is converted into a
heap-allocated TinyVec
to avoid unnecessary allocations. If it is
Borrowed
, then an allocation may be made.
impl<A: ByteArray> From<String> for TinyString<A>
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pub fn from(s: String) -> Self
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This converts the String
into a heap-allocated TinyVec
to avoid
unnecessary allocations.
impl<A: ByteArray> From<char> for TinyString<A>
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impl<'a, A: ByteArray> FromIterator<&'a char> for TinyString<A>
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pub fn from_iter<I: IntoIterator<Item = &'a char>>(iter: I) -> Self
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impl<'a, A: ByteArray> FromIterator<&'a str> for TinyString<A>
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pub fn from_iter<I: IntoIterator<Item = &'a str>>(iter: I) -> Self
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impl<'a, A: ByteArray> FromIterator<Cow<'a, str>> for TinyString<A>
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pub fn from_iter<I: IntoIterator<Item = Cow<'a, str>>>(iter: I) -> Self
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impl<'a, A: ByteArray> FromIterator<String> for TinyString<A>
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pub fn from_iter<I: IntoIterator<Item = String>>(iter: I) -> Self
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impl<A: ByteArray, A2: ByteArray> FromIterator<TinyString<A2>> for TinyString<A>
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pub fn from_iter<I: IntoIterator<Item = TinyString<A2>>>(iter: I) -> Self
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impl<'a, A: ByteArray> FromIterator<char> for TinyString<A>
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pub fn from_iter<I: IntoIterator<Item = char>>(iter: I) -> Self
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impl<A: ByteArray> FromStr for TinyString<A>
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type Err = Infallible
The associated error which can be returned from parsing.
pub fn from_str(s: &str) -> Result<Self, Self::Err>
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impl<A: ByteArray> Hash for TinyString<A>
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pub fn hash<H: Hasher>(&self, hasher: &mut H)
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pub fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
1.3.0[src]
H: Hasher,
impl<A: ByteArray> Index<Range<usize>> for TinyString<A>
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type Output = str
The returned type after indexing.
pub fn index(&self, index: Range<usize>) -> &str
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impl<A: ByteArray> Index<RangeFrom<usize>> for TinyString<A>
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type Output = str
The returned type after indexing.
pub fn index(&self, index: RangeFrom<usize>) -> &str
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impl<A: ByteArray> Index<RangeFull> for TinyString<A>
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type Output = str
The returned type after indexing.
pub fn index(&self, _index: RangeFull) -> &str
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impl<A: ByteArray> Index<RangeInclusive<usize>> for TinyString<A>
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type Output = str
The returned type after indexing.
pub fn index(&self, index: RangeInclusive<usize>) -> &str
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impl<A: ByteArray> Index<RangeTo<usize>> for TinyString<A>
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type Output = str
The returned type after indexing.
pub fn index(&self, index: RangeTo<usize>) -> &str
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impl<A: ByteArray> Index<RangeToInclusive<usize>> for TinyString<A>
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type Output = str
The returned type after indexing.
pub fn index(&self, index: RangeToInclusive<usize>) -> &str
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impl<A: ByteArray> IndexMut<Range<usize>> for TinyString<A>
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impl<A: ByteArray> IndexMut<RangeFrom<usize>> for TinyString<A>
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impl<A: ByteArray> IndexMut<RangeFull> for TinyString<A>
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impl<A: ByteArray> IndexMut<RangeInclusive<usize>> for TinyString<A>
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pub fn index_mut(&mut self, index: RangeInclusive<usize>) -> &mut str
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impl<A: ByteArray> IndexMut<RangeTo<usize>> for TinyString<A>
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impl<A: ByteArray> IndexMut<RangeToInclusive<usize>> for TinyString<A>
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pub fn index_mut(&mut self, index: RangeToInclusive<usize>) -> &mut str
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impl<A: Ord + ByteArray> Ord for TinyString<A>
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pub fn cmp(&self, other: &TinyString<A>) -> Ordering
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#[must_use]pub fn max(self, other: Self) -> Self
1.21.0[src]
#[must_use]pub fn min(self, other: Self) -> Self
1.21.0[src]
#[must_use]pub fn clamp(self, min: Self, max: Self) -> Self
1.50.0[src]
impl<'a, 'b, A: ByteArray> PartialEq<&'a str> for TinyString<A>
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impl<'a, 'b, A: ByteArray> PartialEq<Cow<'a, str>> for TinyString<A>
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pub fn eq(&self, other: &Cow<'a, str>) -> bool
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pub fn ne(&self, other: &Cow<'a, str>) -> bool
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impl<'a, 'b, A: ByteArray> PartialEq<String> for TinyString<A>
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impl<'a, 'b, A: ByteArray> PartialEq<TinyString<A>> for str
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pub fn eq(&self, other: &TinyString<A>) -> bool
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pub fn ne(&self, other: &TinyString<A>) -> bool
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impl<'a, 'b, A: ByteArray> PartialEq<TinyString<A>> for &'a str
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pub fn eq(&self, other: &TinyString<A>) -> bool
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pub fn ne(&self, other: &TinyString<A>) -> bool
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impl<'a, 'b, A: ByteArray> PartialEq<TinyString<A>> for Cow<'a, str>
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pub fn eq(&self, other: &TinyString<A>) -> bool
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pub fn ne(&self, other: &TinyString<A>) -> bool
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impl<'a, 'b, A: ByteArray> PartialEq<TinyString<A>> for String
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pub fn eq(&self, other: &TinyString<A>) -> bool
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pub fn ne(&self, other: &TinyString<A>) -> bool
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impl<A1, A2> PartialEq<TinyString<A1>> for TinyString<A2> where
A1: ByteArray,
A2: ByteArray,
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A1: ByteArray,
A2: ByteArray,
pub fn eq(&self, other: &TinyString<A1>) -> bool
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pub fn ne(&self, other: &TinyString<A1>) -> bool
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impl<'a, 'b, A: ByteArray> PartialEq<str> for TinyString<A>
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impl<A: PartialOrd + ByteArray> PartialOrd<TinyString<A>> for TinyString<A>
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pub fn partial_cmp(&self, other: &TinyString<A>) -> Option<Ordering>
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pub fn lt(&self, other: &TinyString<A>) -> bool
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pub fn le(&self, other: &TinyString<A>) -> bool
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pub fn gt(&self, other: &TinyString<A>) -> bool
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pub fn ge(&self, other: &TinyString<A>) -> bool
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impl<A: ByteArray> StructuralEq for TinyString<A>
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impl<A: ByteArray> Write for TinyString<A>
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Auto Trait Implementations
impl<A> RefUnwindSafe for TinyString<A> where
A: RefUnwindSafe,
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A: RefUnwindSafe,
impl<A> Send for TinyString<A> where
A: Send,
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A: Send,
impl<A> Sync for TinyString<A> where
A: Sync,
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A: Sync,
impl<A> Unpin for TinyString<A> where
A: Unpin,
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A: Unpin,
impl<A> UnwindSafe for TinyString<A> where
A: UnwindSafe,
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A: UnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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impl<T> ToString for T where
T: Display + ?Sized,
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T: Display + ?Sized,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,