gistfile1.cpp

/*
 * I am building a mechanism for selecting member function overloads without
 * having to use C-style casts.  It works today on non-member functions and
 * non-const member functions.  The syntax looks like:
 *
 *     select_overload<int(int)>(&some_overloaded_function)
 *     select_overload<int(int)>(&some_overloaded_member_function)
 *
 * You can see the implementation of select_overload at http://pastie.org/7649267
 * 
 * My question is: how do I match const member functions?  I cannot find the
 * correct incantations.  How can I get either #1 or #2, below, to compile?
 */

#include <stdio.h>
#include <typeinfo>

struct S {
  S(): field(0) {}

	int field;
	void foo() {}
	void bar() const {}
};

template<typename Signature, typename ClassType>
void siggy(const char* name, Signature ClassType::*f) {
	printf("%s: %s\n", name, typeid(Signature).name());
}

template<typename Signature, typename ClassType>
void const_siggy(const char* name, /* what do i put here? */ Signature ClassType::* f) {
	printf("%s: %s\n", name, typeid(Signature).name());
}

int main(int argc, const char* argv[]) {
	// prints 'int'
	siggy("S::field", &S::field);

	// prints 'void __thiscall(void)'
	siggy("S::foo", &S::foo);

	// #1 - does not match:
	// error C2664: 'siggy' : cannot convert parameter 2 from 'void (__thiscall S::* )(void) const' to 'void (__thiscall S::* )(void)'
	//siggy("S::bar", &S::bar);

	// #2 - does not match:
	// error C2664: 'const_siggy' : cannot convert parameter 2 from 'void (__thiscall S::* )(void) const' to 'void (__thiscall S::* )(void)'
	//const_siggy("S::bar", &S::bar);
}