Le samedi 19 juillet 2008 à 12:29 +0100, Chris Vine a écrit :> On Tue, 15 Jul 2008 11:34:41 -0400> "Vallone, Anthony" <anthony.vallone@xxxxxxxx> wrote:> > > Only if the member function is static. Calling a non-static member> > function requires two addresses: the instance address and the function> > address. Whether its public or private doesn't matter because access> > to function pointers is not checked by compilers. I frequently do> > something like this:> > > > class SomeClass> > {> > ...> > private:> > ...> > static void staticCb(..., gpointer inInstance) {> > SomeClass* instance = (SomeClass*)inInstance;> > instance->callback(...);> > }> > void callback(...) {> > ...> > }> > ...> > void someFunc() {> > ...> > g_signal_connect(..., G_CALLBACK(&staticCb), this);> > ...> > }> > ...> > };> > This will work with gcc/g++ but it is not standard conforming, as> static class functions do not have C linkage, and the C++ standard> states that functions otherwise identical with C++ and C linkage are> different types.> > To be standard conforming you should use a friend function (if it needs> access to private data) declared extern "C".> > Chris
The extern "C" declaration is not needed.
Regards,Jean
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