# 1.0.0[−][src]Struct std::fmt::Arguments

    pub struct Arguments<'a> where
        'a: 'a,  { /* fields omitted */ }

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);Run

## Trait Implementations

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`impl<'a> Clone for Arguments<'a>`

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`fn clone(&self) -> Arguments<'a>`

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Returns a copy of the value. Read more

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`fn clone_from(&mut self, source: &Self)`

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Performs copy-assignment from `source`. Read more

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`impl<'a> Debug for Arguments<'a>`

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`fn fmt(&self, fmt: &mut Formatter) -> Result<(), Error>`

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Formats the value using the given formatter. Read more

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`impl<'a> Copy for Arguments<'a>`

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`impl<'a> Display for Arguments<'a>`

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`fn fmt(&self, fmt: &mut Formatter) -> Result<(), Error>`

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Formats the value using the given formatter. Read more

## Auto Trait Implementations

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

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

## Blanket Implementations

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`impl<T, U> TryFrom for T where T: From<U>,`

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#### `type Error = !`

🔬 This is a nightly-only experimental API. (`try_from` #33417)

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>`

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🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

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`impl<T> From for T`

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`fn from(t: T) -> T`

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Performs the conversion.

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`impl<T, U> TryInto for T where U: TryFrom<T>,`

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

🔬 This is a nightly-only experimental API. (`try_from` #33417)

The type returned in the event of a conversion error.

####

`fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`

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🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

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

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`fn into(self) -> U`

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Performs the conversion.

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`impl<T> Borrow for T where T: ?Sized,`

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####
ⓘImportant traits for &'a mut I

### Important traits for &'a mut I

`impl<'a, I> Iterator for &'a mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`

`fn borrow(&self) -> &T`

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Immutably borrows from an owned value. Read more

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`impl<T> BorrowMut for T where T: ?Sized,`

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####
ⓘImportant traits for &'a mut I

### Important traits for &'a mut I

`impl<'a, I> Iterator for &'a mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`

`fn borrow_mut(&mut self) -> &mut T`

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Mutably borrows from an owned value. Read more

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

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`fn get_type_id(&self) -> TypeId`

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🔬 This is a nightly-only experimental API. (`get_type_id` #27745)

this method will likely be replaced by an associated static

Gets the `TypeId` of `self`. Read more

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`impl<T> ToOwned for T where T: Clone,`

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#### `type Owned = T`

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`fn to_owned(&self) -> T`

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

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`fn clone_into(&self, target: &mut T)`

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🔬 This is a nightly-only experimental API. (`toowned_clone_into` #41263)

recently added

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

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`impl<T> ToString for T where T: Display + ?Sized,`

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`fn to_string(&self) -> String`

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Converts the given value to a `String`. Read more

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