访问违反std :: function assignement使用lambdas [英] Access violation on std::function assignement using lambdas
问题描述
我纠正，使用克隆方法建议，但我有一个错误，也发生在我尝试memcpy事情（上面的问题）之前。
我想要做的是创建一个lambda，捕获当前脚本并执行它，然后传递和存储在一个对象（触发器*），在成员InternalCallback 。
我在lambda分配中遇到访问冲突错误： http://imgur.com/OKLMJpa
只有在这个代码的第4次迭代时才会发生错误：
if（CheckHR（EnginePTR-> ; iPhysics-> CreateFromFile（physicsPath，StartingTriggerID，trans，scale，-1，false，engPtr））== HR_Correct）
{
_Lua :: ScriptedEntity * newScript = EntityBase-> Clone ）; // nullptr;
string luaPath = transforms.next_sibling（）。next_sibling（）。first_attribute（）。as_string（）;
if（UseRelativePaths）
{
stringstream temp2;
temp2<< _Core :: ExePath（）<< LuaSubfolder<< \\<< luaPath;
luaPath = temp2.str（）;
}
newScript-> CompileFile（luaPath.c_str（））;
newScript-> EnginePTR_voidptr = engPtr;
auto callback = [=]（_ Physics :: Trigger * trigger，PxTriggerPair * pairs，PxU32 count）
{
newScript-> SelectScriptFunction（TriggerCallback）;
newScript-> AddParam（trigger-> Id）;
auto data =（_Physics :: RayCastingStats *）pairs-> otherShape-> userData;
newScript-> AddParam（（PxU8）pairs-> flags）;
newScript-> AddParam（data-> ID）;
newScript-> AddParam（（int）data-> Type）;
newScript-> AddParam（（int）count）;
newScript-> Go（1）;
return;
};
（（_Physics :: Trigger *）EnginePTR-> iPhysics-> GetPhysicObject（StartingTriggerID）） - > InternalCallback = callback;
StartingTriggerID ++;
}
这是Trigger的代码
class Trigger：public PhysicObject
{
public：
Trigger（）
{
ActorDynamic = nullptr;
ActorStatic = nullptr;
InternalCallback = nullptr;
}
virtual HRESULT更新（float ElapsedTime，void * EnginePTR）;
virtual HRESULT Cleanup（）; //释放演员！
long Id;
ShapeTypes类型;
static const PhysicObjectType PhysicsType = PhysicObjectType :: Trigger;
PxVec3 Scale;
void * UserData;
void Callback（PxTriggerPair * pairs，PxU32 count）
{
InternalCallback（this，pairs，count）;
}
function< void（_Physics :: Trigger * trigger，PxTriggerPair * pairs，PxU32 count）>内部回
};
通过迭代，我的意思是作为一个for循环的一部分。
我的系统是Win 7 64位，Intel i3，NVIDIA GTX 480和编译器Visual Studio 2012 Express，使用C ++ 11工具集。
我真的没有想法。我测试了堆腐败，它似乎是好的，我改变了捕获在lambda，改变什么，我跳过第4个对象，它的工作原理。
任何帮助将非常感激。
编辑：根据需要，这里是callstack： http://imgur.com/P7P3t4k
已解决。这是一个设计错误。我在地图中存储了很多对象，它们都是从一个对象类派生出来的（像上面一样，Trigger从PhysicObject派生）。
问题是，我有ID冲突，所以存储在ID 5中的对象不是一个触发器，所以铸造创建了一个坏的对象，所以程序崩溃。
愚蠢的错误，真的具体，但它可能有助于某人记住检查时态对象。
Hy everyone, here again. Continuing the code from my previous question : Is this a bad hack? memcpy with virtual classes I corrected that, using the Clone approach as suggested, but I'm having an error that also happened before I tried the memcpy thing(read question above).
What I'm trying to do is to create a lambda that captures the current script and executes it, and then pass and store that lambda in an object ( Trigger*), in the member InternalCallback.
I get an access violation error on the lambda assignment: http://imgur.com/OKLMJpa
The error happens only at the 4th iteration of this code:
if(CheckHR(EnginePTR->iPhysics->CreateFromFile(physicsPath,StartingTriggerID,trans,scale,-1,false,engPtr)) == HR_Correct)
{
_Lua::ScriptedEntity * newScript = EntityBase->Clone(vm);//nullptr;
string luaPath = transforms.next_sibling().next_sibling().first_attribute().as_string();
if(UseRelativePaths)
{
stringstream temp2;
temp2 << _Core::ExePath() << LuaSubfolder << "\\" << luaPath;
luaPath = temp2.str();
}
newScript->CompileFile(luaPath.c_str());
newScript->EnginePTR_voidptr = engPtr;
auto callback = [=](_Physics::Trigger* trigger,PxTriggerPair* pairs, PxU32 count)
{
newScript->SelectScriptFunction("TriggerCallback");
newScript->AddParam(trigger->Id);
auto data = (_Physics::RayCastingStats*)pairs->otherShape->userData;
newScript->AddParam((PxU8)pairs->flags);
newScript->AddParam(data->ID);
newScript->AddParam((int)data->Type);
newScript->AddParam((int)count);
newScript->Go(1);
return;
};
((_Physics::Trigger*)EnginePTR->iPhysics->GetPhysicObject(StartingTriggerID))->InternalCallback = callback;
StartingTriggerID++;
}
This is the code for Trigger
class Trigger : public PhysicObject
{
public:
Trigger()
{
ActorDynamic = nullptr;
ActorStatic = nullptr;
InternalCallback = nullptr;
}
virtual HRESULT Update(float ElapsedTime,void * EnginePTR);
virtual HRESULT Cleanup(); // Release the actor!!
long Id;
ShapeTypes Type;
static const PhysicObjectType PhysicsType = PhysicObjectType::Trigger;
PxVec3 Scale;
void* UserData;
void Callback(PxTriggerPair* pairs,PxU32 count)
{
InternalCallback(this,pairs,count);
}
function<void(_Physics::Trigger* trigger,PxTriggerPair* pairs, PxU32 count)> InternalCallback;
};
By iteration I mean that is part of a for loop. My system is Win 7 64 bits, Intel i3, NVIDIA GTX 480, and the compiler Visual Studio 2012 Express, using the C++11 toolset. I'm really out of ideas. I tested for heap corruption, it appears to be good, I changed the capture in the lambda, changed nothing, I skip the 4th object and it works. Any help would be really appreciated.
Edit: As required, here is the callstack: http://imgur.com/P7P3t4k
Solved. It was a design error. I store a lot of objects in a map, and they all derive from an object class ( like above, where Trigger derives from PhysicObject ). The problem was that I was having IDs collisions, so the object stored in ID 5 wasn't a Trigger, so the cast created a bad object, and so the program crashed.
Silly error, really specific, but it might help somebody to remember to check temporal objects.
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