boost :: python - 如何通过引用传递/指向python重写类的函数

Question

我有一些类函数需要通过指针参数。但是，当我暴露并覆盖boost :: python中的这些函数时，我对参数所做的任何更改都不会反射回原始内容，这意味着它不会像我期望的那样被指针传递。我以前曾将它们作为参考传递，但同样的问题仍然存在。举个例子，我的意思是，这里是我的一些代码，其中没有重要的功能和细节。

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) 

终于在我的Python文件，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); 

我打电话喜欢的效果所以在我的C++代码

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; 
    } 

我创造了这个代码如下这里的示例http://wiki.python.org/moin/boost.python/OverridableVirtualFunctions

脚本编译并且效果添加正确。 python脚本中的打印行打印正确的值。字符对象以400 HP和打印行输出430开头。但是，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。为了清楚起见，这里是从上面的C++代码片段的控制台输出：

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

有人可以帮助我弄清楚如何正确地做这项工作？这将不胜感激。

感谢

如果它的事项，该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; 
    } 
} 

Answer 1

了一点摸索后，好吧，我找到了答案。原来，你必须明确地指出call_method在通过引用传递时（通过使用ref（T））或指针（通过使用ptr（T））不要创建副本。 通过改变

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

到

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

我得到我想要的水煤浆。