Bug 3464 – is( void function() == function) is false

Comments

Comment #0 by dsimcha — 2009-11-01T15:21:27Z

pragma(msg, is( void delegate() == delegate).stringof); // true pragma(msg, is( void function() == function).stringof); // false

Comment #1 by bugzilla — 2009-11-02T00:00:05Z

This is apparently intentional. I recently brought up the same issue on the NG: http://www.digitalmars.com/d/archives/digitalmars/D/The_bizarre_world_of_typeof_99461.html#N99486 Quoting Don: "real function()" is a *function pointer*, but is(xxx == function) tests to see if xxx is a *function*, not a *function pointer*.

Comment #2 by dsimcha — 2009-11-09T06:32:47Z

So what is the proper way to test if something is a function pointer then? It seems horribly inconsistent with delegates.

Comment #3 by samukha — 2009-11-09T07:14:01Z

One way to test: is(typeof(*T.init) == function)

Comment #4 by dsimcha — 2010-08-15T21:23:01Z

I'll mark this invalid, since the language lawyers (IANALL) say it is, and the better solution now that it exists is std.traits.isFunctionPointer.