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#include <iostream>
#include <functional>
#include <memory>
using namespace std;
 
struct connection;
struct login;
struct huin;
 
typedef shared_ptr<connection> connection_ptr;
typedef shared_ptr<login> login_ptr;
typedef shared_ptr<huin> huin_ptr;
 
 
void on_message(const connection_ptr& , const login_ptr message ) {
}
 
void on_message(const connection_ptr& , const huin_ptr message ) {
}
 
 
template<class T>
void register_yoba( const function<void(const connection_ptr&, const shared_ptr<T>)> f ) {
 
 
}
 
 
int main() {
	register_yoba<login>(&on_message);
	register_yoba<huin>(&on_message);
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:30:34: error: no matching function for call to ‘register_yoba<login>(<unresolved overloaded function type>)’
  register_yoba<login>(&on_message);
                                  ^
prog.cpp:23:6: note: candidate: ‘template<class T> void register_yoba(std::function<void(const std::shared_ptr<connection>&, std::shared_ptr<_Tp>)>)’
 void register_yoba( const function<void(const connection_ptr&, const shared_ptr<T>)> f ) {
      ^~~~~~~~~~~~~
prog.cpp:23:6: note:   template argument deduction/substitution failed:
prog.cpp:30:23: note:   cannot convert ‘& on_message’ (type ‘<unresolved overloaded function type>’) to type ‘std::function<void(const std::shared_ptr<connection>&, std::shared_ptr<login>)>’
  register_yoba<login>(&on_message);
                       ^~~~~~~~~~~
prog.cpp:31:33: error: no matching function for call to ‘register_yoba<huin>(<unresolved overloaded function type>)’
  register_yoba<huin>(&on_message);
                                 ^
prog.cpp:23:6: note: candidate: ‘template<class T> void register_yoba(std::function<void(const std::shared_ptr<connection>&, std::shared_ptr<_Tp>)>)’
 void register_yoba( const function<void(const connection_ptr&, const shared_ptr<T>)> f ) {
      ^~~~~~~~~~~~~
prog.cpp:23:6: note:   template argument deduction/substitution failed:
prog.cpp:31:22: note:   cannot convert ‘& on_message’ (type ‘<unresolved overloaded function type>’) to type ‘std::function<void(const std::shared_ptr<connection>&, std::shared_ptr<huin>)>’
  register_yoba<huin>(&on_message);
                      ^~~~~~~~~~~

Standard output is empty