Function pointers to non static member functions - c++

Question

Error:
C:\testa\game.cpp|147|error: no matching function for call to 'game::register_handler(PacketFamily, PacketAction,
<unresolved overloaded function type>)'|
Heres part of the code since it's too big.
I had to typedef handler_callback inside class game otherwise one of the two would be undefined for the other.
game.h
class game
{
typedef bool (game::*handler_callback)(PacketReader reader);
public:
bool default_handler_init (PacketReader reader);
void register_default_handlers();
void register_handler(PacketFamily family, PacketAction action,handler_callback callback);
};
game.cpp
void game::register_default_handlers()
{
register_handler(PACKET_F_INIT, PACKET_A_INIT,default_handler_init);
}
void game::register_handler(PacketFamily family, PacketAction action,handler_callback callback)
{
handlers.insert(std::make_pair(std::make_pair(family, action), callback));
}

Answer 1

I expanded the OP's code to the following so that it would compile:
class PacketReader {};
class PacketFamily {};
class PacketAction {};
const PacketFamily PACKET_F_INIT;
const PacketAction PACKET_A_INIT;
class game
{
typedef bool (game::*handler_callback)(PacketReader reader);
public:
bool default_handler_init (PacketReader reader);
void register_default_handlers();
void register_handler(PacketFamily family, PacketAction action, handler_callback callback);
};
void game::register_default_handlers()
{
register_handler(PACKET_F_INIT, PACKET_A_INIT, default_handler_init);
}
void game::register_handler(PacketFamily family, PacketAction action, handler_callback callback)
{
//handlers.insert(std::make_pair(std::make_pair(family, action), callback));
}
Compiling with g++ using the command g++ -c -Wall -std=c++11 test.cpp yields the following errors:
test.cpp: In member function ‘void game::register_default_handlers()’:
test.cpp:18:71: error: no matching function for call to ‘game::register_handler(const PacketFamily&, const PacketAction&, <unresolved overloaded function type>)’
register_handler(PACKET_F_INIT, PACKET_A_INIT,default_handler_init);
^
test.cpp:18:71: note: candidate is:
test.cpp:13:10: note: void game::register_handler(PacketFamily, PacketAction, game::handler_callback)
void register_handler(PacketFamily family, PacketAction action,handler_callback callback);
^
test.cpp:13:10: note: no known conversion for argument 3 from ‘<unresolved overloaded function type>’ to ‘game::handler_callback {aka bool (game::*)(PacketReader)}’
Anyway, to fix the problem, add &game:: to the call to register_handler:
register_handler(PACKET_F_INIT, PACKET_A_INIT,&game::default_handler_init);