Pointer in alloc::fmt - Rust
Description: `p` formatting.
Keywords: rust, rustlang, rust-lang, Pointer

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

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

Expand description

`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

[src]

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

Formats the value using the given formatter.

## Implementations on Foreign Types

1.25.0[src]

### impl<T> Pointer for NonNull<T> where
T: ?Sized,

[src]

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

1.24.0[src]

### impl<T> Pointer for AtomicPtr<T>

[src]

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

1.33.0[src]

### impl<P> Pointer for Pin<P> where
P: Pointer,

[src]

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

## Implementors

[src]

### impl<'_, T> Pointer for &'_ T where
T: ?Sized,

[src]

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

1.4.0[src]

### impl<Ret> Pointer for extern "C" fn() -> Ret

1.4.0[src]

### impl<Ret> Pointer for fn() -> Ret

1.4.0[src]

### impl<Ret> Pointer for unsafe extern "C" fn() -> Ret

1.4.0[src]

### impl<Ret> Pointer for unsafe fn() -> Ret

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

### impl<Ret, A> Pointer for fn(A) -> Ret

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

### impl<Ret, A> Pointer for unsafe fn(A) -> Ret

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

### impl<Ret, A, B> Pointer for fn(A, B) -> Ret

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

### impl<Ret, A, B> Pointer for unsafe fn(A, B) -> Ret

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

### impl<Ret, A, B, C> Pointer for fn(A, B, C) -> Ret

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[src]

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

1.4.0[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

1.4.0[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

1.4.0[src]

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

1.4.0[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

1.4.0[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

1.4.0[src]

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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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

1.4.0[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]

### impl<T> Pointer for *const T where
T: ?Sized,

[src]

### impl<T> Pointer for *mut T where
T: ?Sized,

[src]

### impl<T: ?Sized> Pointer for Rc<T>

[src]

### impl<T: ?Sized> Pointer for Arc<T>

[src]

### impl<T: ?Sized, A: Allocator> Pointer for Box<T, A>