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Struct std::fmt::FormatterFn

pub struct FormatterFn<F>(pub F)
where
    F: Fn(&mut Formatter<'_>) -> Result<(), Error>;
🔬This is a nightly-only experimental API. (debug_closure_helpers #117729)

Implements fmt::Debug and fmt::Display using a function.

Examples

#![feature(debug_closure_helpers)]
use std::fmt;

let value = 'a';
assert_eq!(format!("{}", value), "a");
assert_eq!(format!("{:?}", value), "'a'");

let wrapped = fmt::FormatterFn(|f| write!(f, "{:?}", &value));
assert_eq!(format!("{}", wrapped), "'a'");
assert_eq!(format!("{:?}", wrapped), "'a'");

Tuple Fields

0: F
🔬This is a nightly-only experimental API. (debug_closure_helpers #117729)

Trait Implementations

source 
impl<F> Debug for FormatterFn<F>
where
    F: Fn(&mut Formatter<'_>) -> Result<(), Error>,
source 
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>
Formats the value using the given formatter. Read more
source 
impl<F> Display for FormatterFn<F>
where
    F: Fn(&mut Formatter<'_>) -> Result<(), Error>,
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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>
Formats the value using the given formatter. Read more

Auto Trait Implementations

impl<F> RefUnwindSafe for FormatterFn<F>
where
    F: RefUnwindSafe,
impl<F> Send for FormatterFn<F>
where
    F: Send,
impl<F> Sync for FormatterFn<F>
where
    F: Sync,
impl<F> Unpin for FormatterFn<F>
where
    F: Unpin,
impl<F> UnwindSafe for FormatterFn<F>
where
    F: UnwindSafe,

Blanket Implementations

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impl<T> Any for T
where
    T: 'static + ?Sized,
source 
fn type_id(&self) -> TypeId
Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where
    T: ?Sized,
source 
fn borrow(&self) -> &T
Immutably borrows from an owned value. Read more
source 
impl<T> BorrowMut<T> for T
where
    T: ?Sized,
source 
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
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impl<T> From<T> for T
source 
fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where
    U: From<T>,
source 
fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source 
impl<T> ToString for T
where
    T: Display + ?Sized,
source 
default fn to_string(&self) -> String
Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where
    U: Into<T>,
 
type Error = Infallible
The type returned in the event of a conversion error.
source 
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
Performs the conversion.
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impl<T, U> TryInto<U> for T
where
    U: TryFrom<T>,
 
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
source 
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
Performs the conversion.

© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/fmt/struct.FormatterFn.html