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#include <iostream>
using namespace std;
 
#include <memory>
#include <type_traits>
 
//class Manager;
 
class Game
{
public:
    enum class State
    {
        MAIN_MENU = 0x00000001,
        PLAY      = 0x00000002,
        PAUSE     = 0x00000004,
    };
 
    static Game& Instance()
    {
        static Game sGame;
        return sGame;
    }
 
    void Run();
 
    void SetState(State state);
 
private:
    //Game();
    //~Game() = default;
 
    State mState = State::MAIN_MENU;
    //std::unique_ptr<Manager> mManager;// = nullptr;
};
 
inline Game::State operator|(Game::State lhs, Game::State rhs)
{
    using type = std::underlying_type<Game::State>::type;
    return static_cast<Game::State>(static_cast<type>(lhs) | static_cast<type>(rhs));
}
 
inline Game::State operator&(Game::State lhs, Game::State rhs)
{
    using type = std::underlying_type<Game::State>::type;
    return static_cast<Game::State>(static_cast<type>(lhs) & static_cast<type>(rhs));
}
 
int main() {
	// your code goes here
	return 0;
}

In file included from /usr/include/c++/4.9/type_traits:35:0,
                 from prog.cpp:5:
/usr/include/c++/4.9/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
 #error This file requires compiler and library support for the \
  ^
prog.cpp:12:5: warning: scoped enums only available with -std=c++11 or -std=gnu++11
     enum class State
     ^
prog.cpp:33:27: warning: non-static data member initializers only available with -std=c++11 or -std=gnu++11
     State mState = State::MAIN_MENU;
                           ^
prog.cpp:33:20: error: 'State' is not a class or namespace
     State mState = State::MAIN_MENU;
                    ^
prog.cpp: In function 'Game::State operator|(Game::State, Game::State)':
prog.cpp:39:11: error: expected nested-name-specifier before 'type'
     using type = std::underlying_type<Game::State>::type;
           ^
prog.cpp:40:49: error: 'type' does not name a type
     return static_cast<Game::State>(static_cast<type>(lhs) | static_cast<type>(rhs));
                                                 ^
prog.cpp:40:74: error: 'type' does not name a type
     return static_cast<Game::State>(static_cast<type>(lhs) | static_cast<type>(rhs));
                                                                          ^
prog.cpp: In function 'Game::State operator&(Game::State, Game::State)':
prog.cpp:45:11: error: expected nested-name-specifier before 'type'
     using type = std::underlying_type<Game::State>::type;
           ^
prog.cpp:46:49: error: 'type' does not name a type
     return static_cast<Game::State>(static_cast<type>(lhs) & static_cast<type>(rhs));
                                                 ^
prog.cpp:46:74: error: 'type' does not name a type
     return static_cast<Game::State>(static_cast<type>(lhs) & static_cast<type>(rhs));
                                                                          ^

Standard output is empty