I have an exercise and I could not understand what the assignment is talking about.

This is the text of the exercise

Provide static vector implementation in modern C++.
Class must be named static_vector and templated by the stored type
and vector’s capacity. Class must provide methods:

capacity()
push_back()
size()
subscript operator [ ]

So far I came up with this code

template <class T, unsigned int C>
class static_vector{
public:
    unsigned int capacity() {return vect_capacity;}
    void push_back(T item) {}
    unsigned int size() {}
    T& operator[] (unsigned int index) {}

private:
    unsigned int vect_capacity;    
};

My misunderstanding is about the meaning of static and the development of the required functions.
Any help would be much appreciated.