问题描述
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我有一些通过指针接收参数的类函数。但是,当我在boost :: python中公开并覆盖这些函数时,我对参数所做的任何更改都不会反映回原始值,这意味着它不会像我期望的那样被指针传递。我以前将它们作为传递参考,但是仍然出现相同的问题。对于我的意思的示例,这是我的一些代码,其中不重要的功能和细节都省略了。
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,int ticks = 1);
}
//In the actual scripting code
void StatusEffectWrapper::TickCharacter(Game::Character::BaseCharacter* character,int ticks)
{
call_method<void>(self,\"TickCharacter\",character,field,ticks);
}
void StatusEffectWrapper::TickCharacterDefault(Game::Character::BaseCharacter* character,int ticks)
{
this->StatusEffect::TickCharacter(character,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,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,True,StatusCategories.SC_Regen,StatusFlags.TickEffect,StatusPersistence.SP_Timer_Cure)
SELibrary.AddPythonEffect(Regen);
我在C ++代码中这样称呼效果
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;
}
我按照以下示例创建了此代码,网址为http://wiki.python.org/moin/boost.python/OverridableVirtualFunctions
脚本将编译,并且效果已正确添加。 python脚本中的打印行会打印正确的值。字符对象以400 HP开始,打印行输出430。但是,我的C ++代码中的std :: cout行始终输出400,这意味着脚本添加的额外30 HP不会在原始对象中反映出来。为了清楚起见,这是上述C ++代码片段的控制台输出:
HP Regenerated on character Arian New HP: 430
Character HP: 400
有人可以帮我弄清楚如何使其正常工作吗?非常感谢。
谢谢
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;
}
}
解决方法
在四处寻找之后,我找到了答案。事实证明,当通过引用(使用ref(T))或指针(使用ptr(T))传递call_method时,您必须明确指示不进行复制。
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);
}
至
void StatusEffectWrapper::TickCharacter(Game::Character::BaseCharacter* character,ptr(character),ptr(field),ticks);
}
我得到我想要的行为。