# Function null_mut

1.6.0 (const: 1.24.0) · Source

    pub const fn null_mut<T: PointeeSized + Thin>() -> *mut T

Expand description

Creates a null mutable raw pointer.

This function is equivalent to zero-initializing the pointer: `MaybeUninit::<*mut T>::zeroed().assume_init()`. The resulting pointer has the address 0.

## §Examples

    use std::ptr;

    let p: *mut i32 = ptr::null_mut();
    assert!(p.is_null());
    assert_eq!(p as usize, 0); // this pointer has the address 0