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std: non-byte-multiple sized integers have no definite representation

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Closes #7445
This commit is contained in:
LemonBoy 2020-12-14 18:59:24 +01:00
parent a471a57560
commit 44556bfebe
1 changed files with 10 additions and 11 deletions
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21
lib/std/meta/trait.zig
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@ -481,10 +481,13 @@ pub fn hasUniqueRepresentation(comptime T: type) bool {
.Enum,
.ErrorSet,
.Fn,
.Int, // TODO check that it is still true
.Pointer,
=> return true,
// The padding bits are undefined.
.Int => |info| return (info.bits % 8) == 0 and
(info.bits == 0 or std.math.isPowerOfTwo(info.bits)),
.Array => |info| return comptime hasUniqueRepresentation(info.child),
.Struct => |info| {
@ -525,14 +528,10 @@ test "std.meta.trait.hasUniqueRepresentation" {
testing.expect(hasUniqueRepresentation(TestStruct3));
testing.expect(hasUniqueRepresentation(i1));
testing.expect(hasUniqueRepresentation(u2));
testing.expect(hasUniqueRepresentation(i3));
testing.expect(hasUniqueRepresentation(u4));
testing.expect(hasUniqueRepresentation(i5));
testing.expect(hasUniqueRepresentation(u6));
testing.expect(hasUniqueRepresentation(i7));
testing.expect(hasUniqueRepresentation(u8));
testing.expect(hasUniqueRepresentation(i9));
testing.expect(hasUniqueRepresentation(u10));
inline for ([_]type{ i0, u8, i16, u32, i64 }) |T| {
testing.expect(hasUniqueRepresentation(T));
}
inline for ([_]type{ i1, u9, i17, u33, i24 }) |T| {
testing.expect(!hasUniqueRepresentation(T));
}
}