/in/foo.cc: In member function 'void Pig::use_card(std::vector<card>::iterator, char)':
/in/foo.cc:297:20: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
             if(tmp = try_kill())
                ~~~~^~~~~~~~~~~~
/in/foo.cc:310:20: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
             if(tmp = try_fight())
                ~~~~^~~~~~~~~~~~~
/in/foo.cc: In member function 'int Pig::try_kill()':
/in/foo.cc:489:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^