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std.meta.hasUniqueRepresentation: Handle optional pointers correctly (#20366)

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std.meta.hasUniqueRepresentation should now return true for non-slice optional pointers. Additional checks were added to the test to reflect this.
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Sean 2024-06-22 23:33:45 -04:00 committed by GitHub
parent 642093e04b
commit f1b6f1aeb3
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1 changed files with 15 additions and 0 deletions
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lib/std/meta.zig
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@ -1203,6 +1203,14 @@ pub inline fn hasUniqueRepresentation(comptime T: type) bool {
.Pointer => |info| info.size != .Slice,
.Optional => |info| switch (@typeInfo(info.child)) {
.Pointer => |ptr| !ptr.is_allowzero and switch (ptr.size) {
.Slice, .C => false,
.One, .Many => true,
},
else => false,
},
.Array => |info| hasUniqueRepresentation(info.child),
.Struct => |info| {
@ -1301,8 +1309,15 @@ test hasUniqueRepresentation {
try testing.expect(!hasUniqueRepresentation(T));
}
try testing.expect(hasUniqueRepresentation(*u8));
try testing.expect(hasUniqueRepresentation(*const u8));
try testing.expect(hasUniqueRepresentation(?*u8));
try testing.expect(hasUniqueRepresentation(?*const u8));
try testing.expect(!hasUniqueRepresentation([]u8));
try testing.expect(!hasUniqueRepresentation([]const u8));
try testing.expect(!hasUniqueRepresentation(?[]u8));
try testing.expect(!hasUniqueRepresentation(?[]const u8));
try testing.expect(hasUniqueRepresentation(@Vector(std.simd.suggestVectorLength(u8) orelse 1, u8)));
try testing.expect(@sizeOf(@Vector(3, u8)) == 3 or !hasUniqueRepresentation(@Vector(3, u8)));