state.hh

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#ifndef UTOPIA_CORE_STATE_HH
#define UTOPIA_CORE_STATE_HH
 
namespace Utopia {
 
 
enum class Update {
    manual, 
    sync, 
    async 
};
 
 
template<typename StateType, Update mode>
class StateContainer;
 
template<typename StateType>
class StateContainer<StateType, Update::manual>
{
public:
    using State = StateType;
    State state;
 
 
    StateContainer (const State state_initial) :
        state(state_initial)
    { }
};
 
 
template<typename StateType>
class StateContainer<StateType, Update::async>
{
public:
    using State = StateType;
 
    static constexpr bool is_sync () { return false; }
 
    StateContainer (const State state):
        _state(state)
    { }
 
    State& state () { return _state; }
    const State& state () const { return _state; } 
 
private:
    State _state;
};
 
 
template<typename StateType>
class StateContainer<StateType, Update::sync>
{
public:
    using State = StateType;
 
    static constexpr bool is_sync () { return true; }
 
    StateContainer (const State state):
        _state(state),
        _state_new(state)
    { }
 
    State& state_new () { return _state_new; }
    const State& state () const { return _state; }
    void update () noexcept { _state = _state_new; }
 
private:
    State _state;
    State _state_new;
};
 
} // namespace Utopia
 
#endif // UTOPIA_CORE_STATE_HH