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问题描述
我们通常如何处理一个元素是指向对象的指针的向量?我的具体问题是下面提供的代码末尾的注释.谢谢.
How do we ususaly deal with a vector whose elements are pointers to object? My specific question is the comment at the end of the code supplied below. Thanks.
class A
{
public:
virtual int play() = 0 ;
};
class B : public A
{
public:
int play() {cout << "play in B " << endl;};
};
class C : public A
{
public:
int play() {cout << "play in C " << endl;};
};
int main()
{
vector<A *> l;
l.push_back(new B());
l.push_back(new C());
for(int i = 0 ; i < l.size();i++)
{
l[i]->play();
}
//Do i have to do this to avoid memory leak? It is akward. Any better way to do this?
for(int i = 0 ; i < l.size();i++)
{
delete l[i];
}
}
推荐答案
是的,您必须这样做才能避免内存泄漏.更好的方法是制作一个共享指针向量(boost、C++TR1、C++0x、)
Yes, you have to do that to avoid memory leak. The better ways to do that are to make a vector of shared pointers (boost, C++TR1, C++0x, )
std::vector<std::tr1::shared_ptr<A> > l;
或唯一指针向量 (C++0x) 如果对象实际上不是在此容器和其他对象之间共享
or vector of unique pointers (C++0x) if the objects are not actually shared between this container and something else
std::vector<std::unique_ptr<A>> l;
或使用 boost 指针容器
boost::ptr_vector<A> l;
PS:不要忘记 A 的虚拟析构函数,正如@Neil Butterworth 所说!
PS: Don't forget A's virtual destructor, as per @Neil Butterworth!
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