alloc::fmt::Pointer - Rust
Description: API documentation for the Rust `Pointer` trait in crate `alloc`.
Keywords: rust, rustlang, rust-lang, Pointer

# 1.0.0[−][src]Trait alloc::fmt::Pointer

    pub trait Pointer {
        fn fmt(&self, f: &mut Formatter) -> Result<(), Error>;
    }

`p` formatting.

The `Pointer` trait should format its output as a memory location. This is commonly presented as hexadecimal.

For more information on formatters, see the module-level documentation.

# Examples

Basic usage with `&i32`:

    let x = &42;

    let address = format!("{:p}", x); // this produces something like '0x7f06092ac6d0'

Run

Implementing `Pointer` on a type:

    use std::fmt;

    struct Length(i32);

    impl fmt::Pointer for Length {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            // use `as` to convert to a `*const T`, which implements Pointer, which we can use

            let ptr = self as *const Self;
            fmt::Pointer::fmt(&ptr, f)
        }
    }

    let l = Length(42);

    println!("l is in memory here: {:p}", l);

    let l_ptr = format!("{:018p}", l);
    assert_eq!(l_ptr.len(), 18);
    assert_eq!(&l_ptr[..2], "0x");

Run

## Required methods

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

Formats the value using the given formatter.

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## Implementations on Foreign Types

### `impl<P> Pointer for Pin<P> where
P: Pointer,` [src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<T> Pointer for NonNull<T> where
T: ?Sized,` [src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<T> Pointer for AtomicPtr<T>`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

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## Implementors

### `impl<'_, T> Pointer for &'_ T where
T: ?Sized,` [src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<'_, T> Pointer for &'_ mut T where
T: ?Sized,` [src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret> Pointer for extern "C" fn() -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret> Pointer for fn() -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret> Pointer for unsafe extern "C" fn() -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret> Pointer for unsafe fn() -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A> Pointer for extern "C" fn(A) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A> Pointer for extern "C" fn(A, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A> Pointer for fn(A) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A> Pointer for unsafe extern "C" fn(A) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A> Pointer for unsafe extern "C" fn(A, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A> Pointer for unsafe fn(A) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B> Pointer for extern "C" fn(A, B) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B> Pointer for extern "C" fn(A, B, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B> Pointer for fn(A, B) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B> Pointer for unsafe extern "C" fn(A, B) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B> Pointer for unsafe extern "C" fn(A, B, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B> Pointer for unsafe fn(A, B) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C> Pointer for extern "C" fn(A, B, C) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C> Pointer for extern "C" fn(A, B, C, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C> Pointer for fn(A, B, C) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C> Pointer for unsafe extern "C" fn(A, B, C) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C> Pointer for unsafe extern "C" fn(A, B, C, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C> Pointer for unsafe fn(A, B, C) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D> Pointer for extern "C" fn(A, B, C, D) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D> Pointer for extern "C" fn(A, B, C, D, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D> Pointer for fn(A, B, C, D) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D> Pointer for unsafe extern "C" fn(A, B, C, D) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D> Pointer for unsafe extern "C" fn(A, B, C, D, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D> Pointer for unsafe fn(A, B, C, D) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E> Pointer for extern "C" fn(A, B, C, D, E) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E> Pointer for extern "C" fn(A, B, C, D, E, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E> Pointer for fn(A, B, C, D, E) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E> Pointer for unsafe extern "C" fn(A, B, C, D, E) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E> Pointer for unsafe extern "C" fn(A, B, C, D, E, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E> Pointer for unsafe fn(A, B, C, D, E) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F> Pointer for extern "C" fn(A, B, C, D, E, F) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F> Pointer for extern "C" fn(A, B, C, D, E, F, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F> Pointer for fn(A, B, C, D, E, F) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F> Pointer for unsafe extern "C" fn(A, B, C, D, E, F) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F> Pointer for unsafe extern "C" fn(A, B, C, D, E, F, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F> Pointer for unsafe fn(A, B, C, D, E, F) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G> Pointer for extern "C" fn(A, B, C, D, E, F, G) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G> Pointer for extern "C" fn(A, B, C, D, E, F, G, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G> Pointer for fn(A, B, C, D, E, F, G) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G> Pointer for unsafe extern "C" fn(A, B, C, D, E, F, G) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G> Pointer for unsafe extern "C" fn(A, B, C, D, E, F, G, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G> Pointer for unsafe fn(A, B, C, D, E, F, G) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H> Pointer for extern "C" fn(A, B, C, D, E, F, G, H) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H> Pointer for extern "C" fn(A, B, C, D, E, F, G, H, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H> Pointer for fn(A, B, C, D, E, F, G, H) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H> Pointer for unsafe extern "C" fn(A, B, C, D, E, F, G, H) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H> Pointer for unsafe extern "C" fn(A, B, C, D, E, F, G, H, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H> Pointer for unsafe fn(A, B, C, D, E, F, G, H) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I> Pointer for extern "C" fn(A, B, C, D, E, F, G, H, I) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I> Pointer for extern "C" fn(A, B, C, D, E, F, G, H, I, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I> Pointer for fn(A, B, C, D, E, F, G, H, I) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I> Pointer for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I> Pointer for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I> Pointer for unsafe fn(A, B, C, D, E, F, G, H, I) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J> Pointer for extern "C" fn(A, B, C, D, E, F, G, H, I, J) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J> Pointer for extern "C" fn(A, B, C, D, E, F, G, H, I, J, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J> Pointer for fn(A, B, C, D, E, F, G, H, I, J) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J> Pointer for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J> Pointer for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J> Pointer for unsafe fn(A, B, C, D, E, F, G, H, I, J) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Pointer for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Pointer for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Pointer for fn(A, B, C, D, E, F, G, H, I, J, K) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Pointer for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Pointer for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Pointer for unsafe fn(A, B, C, D, E, F, G, H, I, J, K) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Pointer for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Pointer for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Pointer for fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Pointer for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Pointer for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L, ...) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Pointer for unsafe fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<T> Pointer for *const T where
T: ?Sized,` [src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<T> Pointer for *mut T where
T: ?Sized,` [src]

#### `fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`[src]

### `impl<T: ?Sized> Pointer for Box<T>`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result`[src]

### `impl<T: ?Sized> Pointer for Rc<T>`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result`[src]

### `impl<T: ?Sized> Pointer for Arc<T>`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result`[src]

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