╭ packed_struct_explicit_backing_int.zig ───────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
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.. conflicting_externs/ hasdecl/ import/ namespace_depends_on_compile_var/ pub_enum/ x86_64/ zon/ abs.zig addrspace_and_linksection.zig align.zig alignof.zig array.zig asm.zig atomics.zig backing_int.zig basic.zig bit_shifting.zig bitcast.zig bitreverse.zig bool.zig builtin_functions_returning_void_ byteswap.zig byval_arg_var.zig call.zig cast.zig cast_int.zig comptime_memory.zig const_slice_child.zig decl_literals.zig decltest.zig defer.zig destructure.zig duplicated_test_names.zig enum.zig error.zig eval.zig export_builtin.zig export_c_keywords.zig export_keyword.zig export_self_referential_type_info extern.zig extern_struct_zero_size_fields.zi field_parent_ptr.zig file_to_embed.txt floatop.zig fn.zig fn_delegation.zig fn_in_struct_in_comptime.zig for.zig generics.zig globals.zig hasdecl.zig hasfield.zig if.zig import.zig import_c_keywords.zig incomplete_struct_param_tld.zig inline_switch.zig int128.zig int_comparison_elision.zig ir_block_deps.zig lower_strlit_to_vector.zig math.zig maximum_minimum.zig member_func.zig memcpy.zig memmove.zig memset.zig merge_error_sets.zig muladd.zig multiple_externs_with_conflicting namespace_depends_on_compile_var. nan.zig null.zig optional.zig overlapping_assign.zig packed-struct.zig packed-union.zig ╭─────────────────────────────────╮ │packed_struct_explicit_backing_in│ ╰─────────────────────────────────╯ pointers.zig popcount.zig prefetch.zig ptrcast.zig ptrfromint.zig pub_enum.zig ref_var_in_if_after_if_2nd_switch reflection.zig return_address.zig saturating_arithmetic.zig select.zig shuffle.zig sizeof_and_typeof.zig slice.zig slice_sentinel_comptime.zig spirv.zig splat.zig src.zig string_literals.zig struct.zig struct_contains_null_ptr_itself.z struct_contains_slice_of_itself.z switch.zig switch_loop.zig switch_on_captured_error.zig switch_prong_err_enum.zig switch_prong_implicit_cast.zig this.zig threadlocal.zig truncate.zig try.zig tuple.zig tuple_declarations.zig type.zig type_info.zig typename.zig undefined.zig underscore.zig union.zig var_args.zig vector.zig void.zig wasm.zig while.zig widening.zig wrapping_arithmetic.zig x86_64.zig zero.bin zon.zig
1 const std = @import("std"); 2 const builtin = @import("builtin"); 3 const assert = std.debug.assert; 4 const expectEqual = std.testing.expectEqual; 5 const native_endian = builtin.cpu.arch.endian(); 6 7 test "packed struct explicit backing integer" { 8 if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO 9 if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO 10 11 const S1 = packed struct { a: u8, b: u8, c: u8 }; 12 13 const S2 = packed struct(i24) { d: u8, e: u8, f: u8 }; 14 15 const S3 = packed struct { x: S1, y: S2 }; 16 const S3Padded = packed struct(u64) { s3: S3, pad: u16 }; 17 18 try expectEqual(48, @bitSizeOf(S3)); 19 try expectEqual(@sizeOf(u48), @sizeOf(S3)); 20 21 try expectEqual(3, @offsetOf(S3, "y")); 22 try expectEqual(24, @bitOffsetOf(S3, "y")); 23 24 if (native_endian == .little) { 25 const s3 = @as(S3Padded, @bitCast(@as(u64, 0xe952d5c71ff4))).s3; 26 try expectEqual(@as(u8, 0xf4), s3.x.a); 27 try expectEqual(@as(u8, 0x1f), s3.x.b); 28 try expectEqual(@as(u8, 0xc7), s3.x.c); 29 try expectEqual(@as(u8, 0xd5), s3.y.d); 30 try expectEqual(@as(u8, 0x52), s3.y.e); 31 try expectEqual(@as(u8, 0xe9), s3.y.f); 32 } 33 34 const S4 = packed struct { a: i32, b: i8 }; 35 const S5 = packed struct(u80) { a: i32, b: i8, c: S4 }; 36 const S6 = packed struct(i80) { a: i32, b: S4, c: i8 }; 37 38 const expectedBitSize = 80; 39 const expectedByteSize = @sizeOf(u80); 40 try expectEqual(expectedBitSize, @bitSizeOf(S5)); 41 try expectEqual(expectedByteSize, @sizeOf(S5)); 42 try expectEqual(expectedBitSize, @bitSizeOf(S6)); 43 try expectEqual(expectedByteSize, @sizeOf(S6)); 44 45 try expectEqual(5, @offsetOf(S5, "c")); 46 try expectEqual(40, @bitOffsetOf(S5, "c")); 47 try expectEqual(9, @offsetOf(S6, "c")); 48 try expectEqual(72, @bitOffsetOf(S6, "c")); 49 } 50