如何重写STL容器功能

Question

It's possible, that override some function stl container with the same paremeters? I want override exactly push_back with some if inside function. I try but, always have error/information about that function is in vector.

Answer 1

Inheritance for STL containers is bad approach. The vector is not supposed to have derived classes. There are no virtual method in the vector and virtual destructor ( the last one could make a lot of problems ). You can create your own class and use vector as member.

Answer 2

Overriding means that you are going to inherit from STL container. Don't do that! STL containers are not designed for inheriting from them.

---

As an option, you might encapsulate std::vector into some wrapper class and perform additional functionality before pushing, something like:

template<typename T>
class Wrapper
{
public:
    template<typename U>
    void push(U&& e)
    {
         // some additional processing
         data.push_back(std::forward<U>(e));
    }

private:
    std::vector<T> data;
};

Answer 3

You cant do that. Most classes in the std library are not meant to be inherited from. However, instead of changing it "from the inside" just do it "from the outside", for example:

template<typename T> myPush(std::vector<T>& v,T element) {
    if (someCondition()) { v.push(element); }
}

Alternatively, you could do this:

struct MyCustomVector {
     void my_push( T element);
     /* pulic or private: */          // depends on what you want/need
     std::vector<T> vect;
};