zig/doc/langref/test_packed_struct_field_address.zig

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const std = @import("std");
const expect = std.testing.expect;
const BitField = packed struct {
a: u3,
b: u3,
c: u2,
};
var bit_field = BitField{
.a = 1,
.b = 2,
.c = 3,
};
test "pointers of sub-byte-aligned fields share addresses" {
try expect(@intFromPtr(&bit_field.a) == @intFromPtr(&bit_field.b));
try expect(@intFromPtr(&bit_field.a) == @intFromPtr(&bit_field.c));
}
// test