int C function

[bearophile]

Ellery Newcomer:

> weird error. anyone know what's going on?

It's a good error message. In DMD 2.056head gives an even better error message:

test6.d(8): Error: function test6.X.tt (int function(const const(char*)) xz) is not callable using argument types (extern (C) int function(const const(char*) s))
test6.d(8): Error: cannot implicitly convert expression (& puts) of type extern (C) int function(const const(char*) s) to int function(const const(char*))


But the error message is not good enough yet, because "const const(char*)" needs to be written "const(char*)".

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Andrej Mitrovic:

> I think this is a side-effect of the new function pointer fixes, where
> you now can't implicitly convert an extern(C) function to an extern(D)
> function by accident (and that's a good thing).

I think it didn't perform a conversion, it just used to produce wrong code.


>  But the problem is,
> you can't define a function with a different linkage type inline as a
> type parameter.

Is this in Bugzilla already?

----------------------

Ellery Newcomer:

> wait, are there explicit ways to convert extern(C) funcs <-> extern(D) funcs?

Maybe a new future job for std.conv.to? (to convert a extern(C) func ponter to extern(D) func pointer).

Bye,
bearophile