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Adds std.meta.FnPtr for easier stage1/stage2 compatibility

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Felix "xq" Queißner 2022-08-24 09:08:30 +02:00 committed by Andrew Kelley
parent 5db80a051f
commit 5696cc8ab6
1 changed files with 24 additions and 0 deletions
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24
lib/std/meta.zig
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@ -1149,3 +1149,27 @@ test "isError" {
try std.testing.expect(isError(math.absInt(@as(i8, -128))));
try std.testing.expect(!isError(math.absInt(@as(i8, -127))));
}
/// This function returns a function pointer for a given function signature.
/// It's a helper to make code compatible to both stage1 and stage2.
///
/// **WARNING:** This function is deprecated and will be removed together with stage1.
pub fn FnPtr(comptime Fn: type) type {
return if (@import("builtin").zig_backend != .stage1)
*const Fn
else
Fn;
}
test "FnPtr" {
var func: FnPtr(fn () i64) = undefined;
// verify that we can perform runtime exchange
// and not have a function body in stage2:
func = std.time.timestamp;
_ = func();
func = std.time.milliTimestamp;
_ = func();
}