StateMachine.hpp

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#ifndef GALAXY_STATE_STATEMACHINE_HPP_
#define GALAXY_STATE_STATEMACHINE_HPP_
 
#include <ankerl/unordered_dense.h>
 
#include "galaxy/meta/Memory.hpp"
#include "galaxy/state/State.hpp"
 
namespace galaxy
{
    namespace state
    {
        class StateMachine final
        {
            using Stack = meta::stack<State*, meta::vector<State*>>;
 
        public:
            StateMachine();
 
            ~StateMachine();
 
            template<std::derived_from<State> Type, typename... Args>
            void add(const std::string& key, Args&&... args);
 
            void push(const std::string& key);
 
            void pop();
 
            void update();
 
        private:
            Stack m_stack;
 
            ankerl::unordered_dense::map<std::string, std::unique_ptr<State>> m_states;
        };
 
        template<std::derived_from<State> Type, typename... Args>
        inline void StateMachine::add(const std::string& key, Args&&... args)
        {
            m_states[key] = std::make_unique<Type>(std::forward<Args>(args)...);
        }
    } // namespace state
} // namespace galaxy
 
#endif