Program Listing for File state_manager.h

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#pragma once

#include "common/common.h"

class StateManager;

class State
{
public:
    virtual ~State() = default;

    virtual void update(StateManager& manager, float deltaMilliseconds) {};

    virtual void enter(StateManager& manager) { }
    virtual Ptr<State> exit(StateManager& manager, float deltaMilliseconds) = 0;
};

class StateManager
{
protected:
    Ptr<State> m_CurrentState;

    StateManager(Ptr<State>&& currentState);
    virtual ~StateManager() = default;

public:
    virtual void update(float deltaMilliseconds);

    void transition(Ptr<State> newState);
};