int C function

[Christophe]

Ellery Newcomer , dans le message (digitalmars.D.learn:29885), a écrit :
> weird error. anyone know what's going on?
> 
> [ellery at localhost d]$ cat test.d
> extern(C) int puts(const char *s);
> class X{
>     @property void tt(int function(const char *) xz){
>     }
> }
> void main(){
>     X x = new X();
>     x.tt = &puts;
> }
> [ellery at localhost d]$ dmd test
> test.d(8): Error: function test.X.tt (int function(const const(char*))
> xz) is not callable using argument types (int C function(const
> const(char*) s))
> test.d(8): Error: cannot implicitly convert expression (& puts) of type
> int C function(const const(char*) s) to int function(const const(char*))

The compiler is actually quite explicit: puts is a C function, and X.tt 
expects a normal D function. You can solve your problem with a wrapper. 
Try:

int cPuts(const char* s) { return puts(s); }

and then :
x.tt = &cPuts();

By the way, it is not very d-ish to use an "int function(const char*)".
we prefer: "int delegate(const char[])". And then:
| int cPuts(const char[] s) { return puts(toStringz(s)); }
But it depends on what you exactly are trying to do.

toStringz can be found in std.string.

-- 
Christophe