boost::如何通过引用/指针传递到python overriden类函数

boost::how to pass by reference/pointer to python overriden class functions

本文关键字:python overriden 类函数 指针 何通过 引用 boost      更新时间:2023-10-16

我有一些类函数通过指针接收参数。然而,当我在boost::python中公开和重写这些函数时,我对参数所做的任何更改都不会反映回原始参数,这意味着它不会像我预期的那样通过指针传递。我以前把它们作为参考,但同样的问题仍然发生了。作为我的意思的一个例子,下面是我的一些代码,省略了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,我尝试做一些类似的事情

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);

我在我的C++代码中这样称呼这种效果

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;
    }

我按照这里的示例创建了此代码http://wiki.python.org/moin/boost.python/OverridableVirtualFunctions

脚本编译后效果添加正确。python脚本中的打印行打印正确的值。角色对象以400 HP开始,打印行输出430。然而,我的C++代码中的std::cout行总是输出400,这意味着脚本添加的额外30 HP不会反映回原始对象中。为了清楚起见,下面是上面C++代码片段的控制台输出:

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

有人能帮我弄清楚如何正确地工作吗?非常感谢。

感谢

如果重要的话,AddPythonEffect定义如下:

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

经过一番搜索,我找到了答案。事实证明,当它通过引用(通过使用ref(T))或指针(通过使用ptr(T)传递时,您必须明确地向call_method指示不要进行复制。通过更改

void StatusEffectWrapper::TickCharacter(Game::Character::BaseCharacter* character, Game::Battles::BattleField *field, int ticks)
{
    call_method<void>(self, "TickCharacter", character, field, ticks);
}

void StatusEffectWrapper::TickCharacter(Game::Character::BaseCharacter* character, Game::Battles::BattleField *field, int ticks)
{
    call_method<void>(self, "TickCharacter", ptr(character), ptr(field), ticks);
}

我得到了我想要的行为。