我传递的unique_ptr的功能,然后将指针移动到另一个的unique_ptr,一切工作正常的需要,但同时点是当它熄灭的unique_ptr不调用析构函数的范围。的unique_ptr不会调用析构函数释放指针
以下是我的代码。和它的输出,代码在eclipse中。
#include <iostream>
#include <memory>
using namespace std;
class BaseCcExpander;
class DeriveHandler;
class ExpansionRuleExecuter;
class DeriveType1;
class ParamBase
{
public :
ParamBase()
{
std::cout << "Ctor:ParamBase:\n";
}
std::unique_ptr<ExpansionRuleExecuter> paramexpander;
virtual ~ParamBase() { std::cout << "Dtor::~ParamBase:\n"; }
virtual void attachBase(int paramGrp,int paramId,std::unique_ptr<ExpansionRuleExecuter> xbaseExpander);
};
ParamBase* obj;
void ParamBase::attachBase(int paramGrp,int paramId,std::unique_ptr<ExpansionRuleExecuter> xbaseExpander)
{
std::cout << "In: ParamBase::attachHandler :\n";
paramexpander = std::move(xbaseExpander);
}
class ExpansionRuleExecuter
{
public:
ExpansionRuleExecuter()
{
std::cout << "Ctor ExpansionRuleExecuter::ExpansionRuleExecuter:\n" << endl;
}
virtual ~ExpansionRuleExecuter(){
std::cout << "Dtor ~ExpansionRuleExecuter::ExpansionRuleExecuter:\n" << endl;
}
virtual void handleExpansion() = 0;
};
class DeriveHandler : public ExpansionRuleExecuter
{
public:
DeriveHandler()
{
std::cout << "Ctor::DeriveHandler:\n" << endl;
}
~DeriveHandler()
{
std::cout << "Dtor::~DeriveHandler:\n" << endl;
}
void handleExpansion()
{
std::cout << "DeriveHandler expanded\n" << endl;
}
};
ParamBase *obj1;
class BaseCcExpander
{
public:
BaseCcExpander()
{
std::cout << "Ctor::BaseCcExpander:\n" << endl;
}
virtual ~BaseCcExpander()
{
std::cout << "Dtor::~BaseCcExpander:\n" << endl;
}
typedef unique_ptr<ExpansionRuleExecuter> ccHandler;
BaseCcExpander::ccHandler ccBaseHandler;
void attachHandler(int paramGrp, int paramId,std::unique_ptr<ExpansionRuleExecuter> xhandler)
{
std::cout << "BaseCcExpander::attachHandler:\n" << endl;
obj1->attachBase(paramGrp,paramId,std::move(xhandler));
}
};
class DeriveType1 : public ParamBase
{
public :
DeriveType1() { std::cout << "Ctor: DeriveType--------1:\n" << endl;}
~DeriveType1() { std::cout << "Dtor::~DeriveType---------1\n" << endl;}
void attachBase(std::unique_ptr<ExpansionRuleExecuter> xbaseExpander);
};
BaseCcExpander ccexpander;
int main()
{
obj1 = new(DeriveType1);
ccexpander.attachHandler(1,2,std::unique_ptr<ExpansionRuleExecuter>(new DeriveHandler));
if(obj1->paramexpander.get())
{
ExpansionRuleExecuter *expand = obj1->paramexpander.get();
expand->handleExpansion();
}
}
对象必须被销毁,使用'delete'释放。 – Pixelchemist
但新被分配到unique_ptr,所以它的unique_ptr的作业被删除了。 – DJB
的'unique_ptr'问题是其成员'* obj1',当后者被破坏就会受到破坏 - 但'* obj1'永远不会销毁:你的程序泄露了。 –