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add std.meta.stringToEnum

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daurnimator 2018-11-26 02:08:12 +11:00 committed by Andrew Kelley
parent a07490a4bc
commit f6cd02be65
1 changed files with 19 additions and 0 deletions
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19
std/meta/index.zig
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@ -76,6 +76,25 @@ test "std.meta.tagName" {
debug.assert(mem.eql(u8, tagName(u2b), "D"));
}
pub fn stringToEnum(comptime T: type, str: []const u8) ?T {
inline for (@typeInfo(T).Enum.fields) |enumField| {
if (std.mem.eql(u8, str, enumField.name)) {
return @field(T, enumField.name);
}
}
return null;
}
test "std.meta.stringToEnum" {
const E1 = enum {
A,
B,
};
debug.assert(E1.A == stringToEnum(E1, "A").?);
debug.assert(E1.B == stringToEnum(E1, "B").?);
debug.assert(null == stringToEnum(E1, "C"));
}
pub fn bitCount(comptime T: type) u32 {
return switch (@typeInfo(T)) {
TypeId.Int => |info| info.bits,