# Function std::ptr::metadata

const: unstable · source ·

    pub fn metadata<T>(ptr: *const T) -> <T as Pointee>::Metadatawhere
        T: ?Sized,

🔬This is a nightly-only experimental API. (`ptr_metadata` #81513)
Expand description

Extract the metadata component of a pointer.

Values of type `*mut T`, `&T`, or `&mut T` can be passed directly to this function as they implicitly coerce to `*const T`.

## Example

    #![feature(ptr_metadata)]

    assert_eq!(std::ptr::metadata("foo"), 3_usize);

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