Defer.h

 
#ifndef ACTIVE_UTILITY_DEFER
#define ACTIVE_UTILITY_DEFER
 
#include <functional>
#include <utility>
 
namespace active::utility {
 
 
    class Defer {
    public:
        
        using Action = std::function<void()>;
        
        Defer(const Action& action) : m_action{action} {}
        Defer(Action&& action) : m_action(std::move(action)) {}
        Defer(Defer&& source) {
            m_action = std::exchange(source.m_action, nullptr);
        }
        Defer(const Defer&) = delete;   //No copy constructor
        Defer& operator=(const Defer&) = delete;    //No assignment operator
        ~Defer() {
            if (m_action)
                m_action(); //Execute the deferred action when destroyed
        }
 
    private:
        Action m_action;
    };
 
 
    inline Defer defer(Defer::Action&& action) {
        return Defer{action};
    }
    
}
 
#endif  //ACTIVE_UTILITY_DEFER