Struct enso_flexer::prelude::logger::prelude::fmt::Arguments1.0.0[−][src]

pub struct Arguments<'a> { /* fields omitted */ }
Expand description

This structure represents a safely precompiled version of a format string and its arguments. This cannot be generated at runtime because it cannot safely be done, so no constructors are given and the fields are private to prevent modification.

The format_args! macro will safely create an instance of this structure. The macro validates the format string at compile-time so usage of the write() and format() functions can be safely performed.

You can use the Arguments<'a> that format_args! returns in Debug and Display contexts as seen below. The example also shows that Debug and Display format to the same thing: the interpolated format string in format_args!.

let debug = format!("{:?}", format_args!("{} foo {:?}", 1, 2));
let display = format!("{}", format_args!("{} foo {:?}", 1, 2));
assert_eq!("1 foo 2", display);
assert_eq!(display, debug);

Implementations

impl<'a> Arguments<'a>[src]

pub fn as_str(&self) -> Option<&'static str>1.52.0[src]

Get the formatted string, if it has no arguments to be formatted.

This can be used to avoid allocations in the most trivial case.

Examples

use std::fmt::Arguments;

fn write_str(_: &str) { /* ... */ }

fn write_fmt(args: &Arguments) {
    if let Some(s) = args.as_str() {
        write_str(s)
    } else {
        write_str(&args.to_string());
    }
}
assert_eq!(format_args!("hello").as_str(), Some("hello"));
assert_eq!(format_args!("").as_str(), Some(""));
assert_eq!(format_args!("{}", 1).as_str(), None);

Trait Implementations

impl<'a> Clone for Arguments<'a>[src]

pub fn clone(&self) -> Arguments<'a>[src]

Returns a copy of the value. Read more

fn clone_from(&mut self, source: &Self)[src]

Performs copy-assignment from source. Read more

impl<'_> Debug for Arguments<'_>[src]

pub fn fmt(&self, fmt: &mut Formatter<'_>) -> Result<(), Error>[src]

Formats the value using the given formatter. Read more

impl<'_> Display for Arguments<'_>[src]

pub fn fmt(&self, fmt: &mut Formatter<'_>) -> Result<(), Error>[src]

Formats the value using the given formatter. Read more

impl<'a> Copy for Arguments<'a>[src]

Auto Trait Implementations

impl<'a> !RefUnwindSafe for Arguments<'a>

impl<'a> !Send for Arguments<'a>

impl<'a> !Sync for Arguments<'a>

impl<'a> Unpin for Arguments<'a>

impl<'a> !UnwindSafe for Arguments<'a>

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized, [src]

pub fn type_id(&self) -> TypeId[src]

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T where
    T: ?Sized, [src]

pub fn borrow(&self) -> &T[src]

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T where
    T: ?Sized, [src]

pub fn borrow_mut(&mut self) -> &mut T[src]

Mutably borrows from an owned value. Read more

impl<T> From<T> for T[src]

pub fn from(t: T) -> T[src]

Performs the conversion.

impl<T> HasRefValue for T where
    T: ?Sized, [src]

type RefValue = T

impl<T, U> Into<U> for T where
    U: From<T>, [src]

pub fn into(self) -> U[src]

Performs the conversion.

impl<T> PhantomConversions for T[src]

fn phantom_into<P>() -> P where
    Self: PhantomInto<P>, [src]

fn phantom_from<P>() -> Self where
    P: PhantomInto<Self>, [src]

impl<T> Same<T> for T

type Output = T

Should always be Self

impl<SS, SP> SupersetOf<SS> for SP where
    SS: SubsetOf<SP>, 

pub fn to_subset(&self) -> Option<SS>

The inverse inclusion map: attempts to construct self from the equivalent element of its superset. Read more

pub fn is_in_subset(&self) -> bool

Checks if self is actually part of its subset T (and can be converted to it).

pub fn to_subset_unchecked(&self) -> SS

Use with care! Same as self.to_subset but without any property checks. Always succeeds.

pub fn from_subset(element: &SS) -> SP

The inclusion map: converts self to the equivalent element of its superset.

impl<T> ToImpl for T[src]

fn to<P>(self) -> P where
    Self: Into<P>, [src]

impl<T> ToOwned for T where
    T: Clone, [src]

type Owned = T

The resulting type after obtaining ownership.

pub fn to_owned(&self) -> T[src]

Creates owned data from borrowed data, usually by cloning. Read more

pub fn clone_into(&self, target: &mut T)[src]

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T> ToRef<T> for T where
    T: ?Sized, [src]

pub fn to_ref(&self) -> &T[src]

impl<T> ToString for T where
    T: Display + ?Sized, [src]

pub default fn to_string(&self) -> String[src]

Converts the given value to a String. Read more

impl<T, U> TryFrom<U> for T where
    U: Into<T>, [src]

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>[src]

Performs the conversion.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, [src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]

Performs the conversion.

impl<T> TypeDisplay for T[src]

pub default fn type_display() -> String[src]

impl<V, T> VZip<V> for T where
    V: MultiLane<T>, 

pub fn vzip(self) -> V

impl<T> Writer for T[src]

pub default fn write_by_level(&self, message: &Array)[src]

Write message using the appropriate console method.