Function bytesAsValue [src]

Given a pointer to an array of bytes, returns a pointer to a value of the specified type backed by those bytes, preserving pointer attributes.

Prototype

pub fn bytesAsValue(comptime T: type, bytes: anytype) BytesAsValueReturnType(T, @TypeOf(bytes))

Parameters

T: type

Example

 test bytesAsValue {
    const deadbeef = @as(u32, 0xDEADBEEF);
    const deadbeef_bytes = switch (native_endian) {
        .big => "\xDE\xAD\xBE\xEF",
        .little => "\xEF\xBE\xAD\xDE",
    };

    try testing.expect(deadbeef == bytesAsValue(u32, deadbeef_bytes).*);

    var codeface_bytes: [4]u8 = switch (native_endian) {
        .big => "\xC0\xDE\xFA\xCE",
        .little => "\xCE\xFA\xDE\xC0",
    }.*;
    const codeface = bytesAsValue(u32, &codeface_bytes);
    try testing.expect(codeface.* == 0xC0DEFACE);
    codeface.* = 0;
    for (codeface_bytes) |b|
        try testing.expect(b == 0);

    const S = packed struct {
        a: u8,
        b: u8,
        c: u8,
        d: u8,
    };

    const inst = S{
        .a = 0xBE,
        .b = 0xEF,
        .c = 0xDE,
        .d = 0xA1,
    };
    const inst_bytes = switch (native_endian) {
        .little => "\xBE\xEF\xDE\xA1",
        .big => "\xA1\xDE\xEF\xBE",
    };
    const inst2 = bytesAsValue(S, inst_bytes);
    try testing.expect(std.meta.eql(inst, inst2.*));
}

Source

  pub fn bytesAsValue(comptime T: type, bytes: anytype) BytesAsValueReturnType(T, @TypeOf(bytes)) {
    return @ptrCast(bytes);
}  