我有一个名为StateMachine的类,它控制所有可能的实体状态。
然后我有一个名为State的类,它是唯一Entity类的基类,例如Attack State,Flee State。
当创建一个新的唯一状态(在StateMachine中)时,它传入一个StateMachine指针,然后该指针将存储在State基类中,以便创建的每个唯一状态都可以访问其状态机。
当我尝试访问指针成员(使用 - >运算符)时,它很简单,没有提出任何公共方法,我也不知道为什么。
如果有人有任何线索,我们将不胜感激。
StateMachine.h
using STATE_PTR = std::shared_ptr<State>;
// Class to implement a finite state machine using the state desing pattern
class StateMachine
{
public:
StateMachine();
~StateMachine();
void OnEnter(STATE_NAME sn);
void OnExit();
void OnEvent(STATE_SYMBOL & ss);
void OnTick(float st);
void ChangeState(STATE_NAME const & sn);
void RegisterState(ENTITY_CLASS const & ec);
typedef std::map<STATE_NAME, STATE_PTR> STATE_REGISTRY;
private:
STATE_REGISTRY state_registry;
STATE_NAME current_state;
};
StateMachine.cpp
using namespace::std;
StateMachine::StateMachine()
: state_registry()
{
current_state = STATE_NAME::UNKNOWN;
}
StateMachine::~StateMachine()
{
state_registry.clear();
}
void StateMachine::OnEnter(STATE_NAME sn)
{
current_state = sn;
if (state_registry[current_state] != nullptr)
{
state_registry[current_state]->OnEnter();
}
}
void StateMachine::OnExit()
{
if (state_registry[current_state] != nullptr)
{
state_registry[current_state]->OnExit();
}
}
void StateMachine::OnTick(float st)
{
}
void StateMachine::OnEvent(STATE_SYMBOL & ss)
{
state_registry[current_state]->OnEvent(ss);
}
void StateMachine::RegisterState(ENTITY_CLASS const & ec)
{
switch (ec)
{
case ENTITY_CLASS::PLAYER_TANK :
state_registry.insert(std::make_pair(STATE_NAME::STATE_1, std::make_shared<PlayerTankState1>(this)));
state_registry.insert(std::make_pair(STATE_NAME::STATE_2, std::make_shared<PlayerTankState2>(this)));
break;
case ENTITY_CLASS::ENEMY_TANK :
state_registry.insert(std::make_pair(STATE_NAME::STATE_3, std::make_shared<EnemyTankState1>(this)));
state_registry.insert(std::make_pair(STATE_NAME::STATE_4, std::make_shared<EnemyTankState2>(this)));
state_registry.insert(std::make_pair(STATE_NAME::STATE_5, std::make_shared<EnemyTankState3>(this)));
break;
default:
break;
}
}
void StateMachine::ChangeState(STATE_NAME const & sn)
{
state_registry[current_state]->OnExit();
current_state = sn;
state_registry[current_state]->OnEnter();
}
State.h
class StateMachine; // Forward decloration of the StateMachine class
// Base class for all states of the game system
class State
{
protected:
State(StateMachine * p)
: mp_Owner(p)
{}
public:
virtual ~State() {}
virtual void OnEnter() = 0;
virtual void OnExit() = 0;
virtual void OnTick(float) = 0;
virtual void OnEvent(STATE_SYMBOL) = 0;
StateMachine * mp_Owner;
};
EnemyTankState.cpp(独特状态)
EnemyTankState1::EnemyTankState1(StateMachine * p)
: State(p)
{
}
EnemyTankState1::~EnemyTankState1()
{
}
void EnemyTankState1::OnEnter()
{
cout << "Hi From Enemy Tank: Partolling State" << endl;
}
void EnemyTankState1::OnExit()
{
cout << "Bye From Enemy Enemy Tank: Partolling State" << endl;
}
void EnemyTankState1::OnTick(float dt)
{
}
void EnemyTankState1::OnEvent(STATE_SYMBOL ss)
{
switch (ss)
{
// Takes Enemy Tank to Attacking State
case STATE_SYMBOL::SYMBOL_2 :
mp_Owner->
break;
}
}
在上面的代码示例中,行mp_Owner->
让我感到悲伤,因为它没有像使用类指针那样打开公共方法列表。
非常感谢任何帮助。很抱歉代码很长,我无法想出任何其他解决问题的方法。