catch_singletons.hpp

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/*
 *  Created by Phil Nash on 15/6/2018.
 *
 *  Distributed under the Boost Software License, Version 1.0. (See accompanying
 *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 */
#ifndef TWOBLUECUBES_CATCH_SINGLETONS_HPP_INCLUDED
#define TWOBLUECUBES_CATCH_SINGLETONS_HPP_INCLUDED
 
namespace Catch {
 
    struct ISingleton {
        virtual ~ISingleton();
    };
 
 
    void addSingleton( ISingleton* singleton );
    void cleanupSingletons();
 
 
    template<typename SingletonImplT, typename InterfaceT = SingletonImplT, typename MutableInterfaceT = InterfaceT>
    class Singleton : SingletonImplT, public ISingleton {
 
        static auto getInternal() -> Singleton* {
            static Singleton* s_instance = nullptr;
            if( !s_instance ) {
                s_instance = new Singleton;
                addSingleton( s_instance );
            }
            return s_instance;
        }
 
    public:
        static auto get() -> InterfaceT const& {
            return *getInternal();
        }
        static auto getMutable() -> MutableInterfaceT& {
            return *getInternal();
        }
    };
 
} // namespace Catch
 
#endif // TWOBLUECUBES_CATCH_SINGLETONS_HPP_INCLUDED