Function must_cast

pub const fn must_cast<A: NoUninit, B: AnyBitPattern>(a: A) -> B

Cast A into B if infalliable, or fail to compile.

Note that for this particular type of cast, alignment isn’t a factor. The input value is semantically copied into the function and then returned to a new memory location which will have whatever the required alignment of the output type is.

Failure

• If the types don’t have the same size this fails to compile.

Examples

// compiles:
let bytes: [u8; 2] = bytemuck::must_cast(12_u16);

// fails to compile (size mismatch):
let bytes : [u8; 3] = bytemuck::must_cast(12_u16);