boost::python - 如何将引用/指针传递给Python重写的类函数

Question

我有一些类的函数，它们通过指针来接收参数。不过，当我在boost::python中暴露并重写这些函数时，我对参数所做的任何修改都没有反映回原来的值，这意味着它并没有像我预期的那样通过指针传递。我之前是用引用传递的，但同样的问题依然存在。为了让你明白我的意思，这里有一些代码，省略了一些不重要的函数和细节。

class StatusEffect
{
public:
      virtual void TickCharacter(Character::BaseCharacter* character, Battles::BattleField *field, int ticks = 1);
}
//In my Scripting Code header file

struct StatusEffectWrapper : Game::StatusEffects::StatusEffect
{
    virtual void TickCharacter(Game::Character::BaseCharacter* character, Game::Battles::BattleField *field, int ticks = 1);
    virtual void TickCharacterDefault(Game::Character::BaseCharacter* character, Game::Battles::BattleField *field, int ticks = 1);
}
//In the actual scripting code
    void StatusEffectWrapper::TickCharacter(Game::Character::BaseCharacter* character, Game::Battles::BattleField *field, int ticks)
    {
        call_method<void>(self, "TickCharacter", character, field, ticks);
    }
    void StatusEffectWrapper::TickCharacterDefault(Game::Character::BaseCharacter* character, Game::Battles::BattleField *field, int ticks)
    {
        this->StatusEffect::TickCharacter(character, field, ticks);
    }

    class_<StatusEffects::StatusEffect, boost::shared_ptr<StatusEffectWrapper> >("StatusEffect")
    .def("TickCharacter", &StatusEffect::TickCharacter, &StatusEffectWrapper::TickCharacterDefault)

最后在我的Python文件中，我尝试做这样的事情

class StatCreepEffect(StatusEffect):
    def __init__(self, name, stat_, rate_, descript, uid, turns, prior, canrefresh, poseffect, cats, conds, flgs, sep, pers):
        StatusEffect.__init__(self, name, descript, uid, turns, prior, canrefresh, poseffect, cats, conds, flgs, sep, pers)
        self.rate = rate_
        self.stat = stat_
    def TickCharacter(self, Character, Field, Ticks):
        if (self.stat == Stat.HP):
            Character.SetHP(int(round(Character.GetHP() + Character.GetInBattleStat(self.stat) * self.rate)))
            print("HP Regenerated on character " + Character.GetName() + " New HP: " + str(Character.GetHP()))
        elif (self.stat == Stat.MP):
            Character.SetMP(int(round(Character.GetMP() + Character.GetInBattleStat(self.stat) * self.rate)))
        elif (self.stat == Stat.SP):
            Character.SetSP(int(round(Character.SetSP() + Character.GetInBattleStat(self.stat) * self.rate)))

Regen = StatCreepEffect("Regen", Stat.HP, 0.05, "Regenerates a small amount of HP every turn", PrimaryEngine.GetUID(), 14, 0, True, True, StatusCategories.SC_Regen, 0, StatusFlags.TickEffect, True, StatusPersistence.SP_Timer_Cure)

SELibrary.AddPythonEffect(Regen);

在我的C++代码中，我是这样调用效果的

StatusEffect* regen = game.GetSELibrary().GetStatusEffect(std::string("Regen"));
while(character.GetHP() < 600)
    {
regen->TickCharacter(&character, &field, 1);
        std::cout << "Character HP: " << character.GetHP() << std::endl;
    }

我创建这段代码是参考这里的例子 http://wiki.python.org/moin/boost.python/OverridableVirtualFunctions

脚本编译成功，效果也正确添加了。Python脚本中的打印语句输出了正确的值。角色对象的初始生命值是400，而打印语句输出的是430。然而，我的C++代码中的std::cout语句总是输出400，这意味着脚本添加的额外30点生命值没有反映回原来的对象。为了更清楚，这里是上面C++代码片段的控制台输出：

HP Regenerated on character Arian New HP: 430
Character HP: 400

有人能帮我弄明白怎么才能让这个正常工作吗？我会非常感激。

谢谢

如果这有关系，AddPythonEffect的定义如下：

void StatusEffectsLibrary::AddPythonEffect(boost::shared_ptr<StatusEffect> effect)
{
    if (effect.get() != nullptr)
    {
        NameToSEMap[effect->GetName()] = effect;
        IDToSEMap[effect->GetUID()] = effect;
    }
}

c# 引用传递 boost.python 跨语言调用类重写参数修改虚函数指针传递

boost::python - 如何将引用/指针传递给Python重写的类函数

1 个回答

撰写回答