快速删除指针的 STL 向量条目的方法

我有一个想要删除的指针向量，但是遍历向量并为每个元素调用delete非常慢。有没有更快的方法？

不幸的是，我真的需要存储指针，因为我使用虚拟超类。简化后，类结构如下所示：

class VirtualSuperClass
{
protected:
    SomeType m_someMember;
    // ...
public:
    virtual void doSomething() = 0;
};
class Subclass_1 : public VirtualSuperClass
{
protected:
    SomeType m_someSubclassMember;
    // ...
public:
    virtual void doSomething() { /* do something*/ }
};
class Subclass_2 : public VirtualSuperClass
{
protected:
    SomeType m_someOtherSubclassMember;
    // ...
public:
    virtual void doSomething() { /* do something else*/ }
}

在我的 main 方法中，我填充超类的指针向量，并为每个元素调用函数doSomething()。

int main()
{
    std::vector<VirtualSuperClass*> vec;
    vec.push_back(new Subclass_1());
    vec.push_back(new Subclass_2());
    vec.push_back(new Subclass_2());
    vec.push_back(new Subclass_1());
    // and so on, about 40,000 elements (not really done with .push_back :) ) ...
    // this actually runs in an application loop
    for (size_t i = 0; i < vec.size(); i++)
    {
        vec[i]->doSomething();
    }
    // ...
    for (size_t i = 0; i < vec.size(); i++)
    {
        delete vec[i];     // <-- pretty slow for large number of elements
        vec[i] = NULL;
    }
    vec.clear();
    return 0;
}