Struct core::fmt::FormatterFn

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pub struct FormatterFn<F>(pub F)
where
    F: Fn(&mut Formatter<'_>) -> Result;
๐Ÿ”ฌThis is a nightly-only experimental API. (debug_closure_helpers #117729)
Expand description

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

ยงExamples

#![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'");
Run

Tuple Fieldsยง

ยง0: F
๐Ÿ”ฌThis is a nightly-only experimental API. (debug_closure_helpers #117729)

Trait Implementationsยง

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impl<F> Debug for FormatterFn<F>
where F: Fn(&mut Formatter<'_>) -> Result,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

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

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementationsยง

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impl<F> Freeze for FormatterFn<F>
where F: Freeze,

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impl<F> RefUnwindSafe for FormatterFn<F>
where F: RefUnwindSafe,

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impl<F> Send for FormatterFn<F>
where F: Send,

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impl<F> Sync for FormatterFn<F>
where F: Sync,

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impl<F> Unpin for FormatterFn<F>
where F: Unpin,

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impl<F> UnwindSafe for FormatterFn<F>
where F: UnwindSafe,

Blanket Implementationsยง

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

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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,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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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

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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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>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.