Function sliceAsBytes [src]

Given a slice, returns a slice of the underlying bytes, preserving pointer attributes.

Prototype

pub fn sliceAsBytes(slice: anytype) SliceAsBytesReturnType(@TypeOf(slice))

Example

 test sliceAsBytes {
    const bytes = [_]u16{ 0xDEAD, 0xBEEF };
    const slice = sliceAsBytes(bytes[0..]);
    try testing.expect(slice.len == 4);
    try testing.expect(eql(u8, slice, switch (native_endian) {
        .big => "\xDE\xAD\xBE\xEF",
        .little => "\xAD\xDE\xEF\xBE",
    }));
}

Source

  pub fn sliceAsBytes(slice: anytype) SliceAsBytesReturnType(@TypeOf(slice)) {
    const Slice = @TypeOf(slice);

    // a slice of zero-bit values always occupies zero bytes
    if (@sizeOf(std.meta.Elem(Slice)) == 0) return &[0]u8{};

    // let's not give an undefined pointer to @ptrCast
    // it may be equal to zero and fail a null check
    if (slice.len == 0 and std.meta.sentinel(Slice) == null) return &[0]u8{};

    const cast_target = CopyPtrAttrs(Slice, .many, u8);

    return @as(cast_target, @ptrCast(slice))[0 .. slice.len * @sizeOf(std.meta.Elem(Slice))];
}  