std::alloc::alloc - Rust
Description: API documentation for the Rust `alloc` fn in crate `std`.
Keywords: rust, rustlang, rust-lang, alloc

# 1.28.0[−][src]Function std::alloc::alloc

    pub unsafe fn alloc(layout: Layout) -> *mut u8

Allocate memory with the global allocator.

This function forwards calls to the `GlobalAlloc::alloc` method of the allocator registered with the `#[global_allocator]` attribute if there is one, or the `std` crate’s default.

This function is expected to be deprecated in favor of the `alloc` method of the `Global` type when it and the `AllocRef` trait become stable.

# Safety

See `GlobalAlloc::alloc`.

# Examples

    use std::alloc::{alloc, dealloc, Layout};

    unsafe {
        let layout = Layout::new::<u16>();
        let ptr = alloc(layout);

        *(ptr as *mut u16) = 42;
        assert_eq!(*(ptr as *mut u16), 42);

        dealloc(ptr, layout);
    }

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