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std: Make met.alignment work on more types

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Make it return the correct value for function types and optional
pointers.
This commit is contained in:
LemonBoy 2021-04-25 16:49:21 +02:00
parent 50a8124f45
commit 19cec0db1e
1 changed files with 16 additions and 3 deletions
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19
lib/std/meta.zig
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@ -117,10 +117,21 @@ test "std.meta.bitCount" {
testing.expect(bitCount(f32) == 32);
}
/// Returns the alignment of type T.
/// Note that if T is a pointer or function type the result is different than
/// the one returned by @alignOf(T).
/// If T is a pointer type the alignment of the type it points to is returned.
/// If T is a function type the alignment a target-dependent value is returned.
pub fn alignment(comptime T: type) comptime_int {
//@alignOf works on non-pointer types
const P = if (comptime trait.is(.Pointer)(T)) T else *T;
return @typeInfo(P).Pointer.alignment;
return switch (@typeInfo(T)) {
.Optional => |info| switch (@typeInfo(info.child)) {
.Pointer, .Fn => alignment(info.child),
else => @alignOf(T),
},
.Pointer => |info| info.alignment,
.Fn => |info| info.alignment,
else => @alignOf(T),
};
}
test "std.meta.alignment" {
@ -129,6 +140,8 @@ test "std.meta.alignment" {
testing.expect(alignment(*align(2) u8) == 2);
testing.expect(alignment([]align(1) u8) == 1);
testing.expect(alignment([]align(2) u8) == 2);
testing.expect(alignment(fn () void) > 0);
testing.expect(alignment(fn () align(128) void) == 128);
}
pub fn Child(comptime T: type) type {