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const std = @import("std");
const native_endian = @import("builtin").target.cpu.arch.endian();
const expect = std.testing.expect;
const Full = packed struct {
number: u16,
};
const Divided = packed struct {
half1: u8,
quarter3: u4,
quarter4: u4,
};
test "@bitCast between packed structs" {
try doTheTest();
try comptime doTheTest();
}
fn doTheTest() !void {
try expect(@sizeOf(Full) == 2);
try expect(@sizeOf(Divided) == 2);
const full = Full{ .number = 0x1234 };
const divided: Divided = @bitCast(full);
try expect(divided.half1 == 0x34);
try expect(divided.quarter3 == 0x2);
try expect(divided.quarter4 == 0x1);
const ordered: [2]u8 = @bitCast(full);
switch (native_endian) {
.big => {
try expect(ordered[0] == 0x12);
try expect(ordered[1] == 0x34);
},
.little => {
try expect(ordered[0] == 0x34);
try expect(ordered[1] == 0x12);
},
}
}
// test
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