Vector impl, C++ (gcc)

Vector impl

//Title of this code

#include <iostream>
using namespace std;

template<class T>
class MyVector {
    T* container;
    int size;
    
    void resize(int);
    inline T& getElementRef(int);
    
  public:
    MyVector(int);
    ~MyVector();
    T& at(int);
    T& operator[](int);
    int getSize();
        
};

template<class T> void MyVector<T>::resize(int pos) {
    while (size <= pos)
        size *= 2;
    container = static_cast<T*>(realloc(container, size));
}

template<class T> inline T& MyVector<T>::getElementRef(int pos) {
    if (pos >= size)
        resize(pos);
    return container[pos];
}

template<class T> MyVector<T>::MyVector(int size) {
    this->size = size;
    container = static_cast<T*>(malloc(size * sizeof(T)));
}

template<class T> MyVector<T>::~MyVector() {
    free(container);
}

template<class T> T& MyVector<T>::at(int pos) {
    return getElementRef(pos);
}

template<class T> T& MyVector<T>::operator[](int pos) {
    return getElementRef(pos);
}

template<class T> int MyVector<T>::getSize() {
    return size;
}

int main()
{
    MyVector<int> v(20);
    
    v[0] = 10;
    v.at(5000) = 20;
    
    cout << v[0] << " " << v.at(5000) << " " << v.getSize() << endl;

}


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