#include <iostream>
#include <vector>
#include <string>

template<typename T>
class CAllocator
{
    private:
        std::size_t size;
        T* data = nullptr;

    public:
        typedef T* pointer;
        typedef const T* const_pointer;

        typedef T& reference;
        typedef const T& const_reference;

        typedef std::size_t size_type;
        typedef std::ptrdiff_t difference_type;

        typedef T value_type;


        CAllocator() {}
        CAllocator(pointer data_ptr, size_type max_size) noexcept : size(max_size), data(data_ptr) {};

        template<typename U>
        CAllocator(const CAllocator<U>& other) noexcept {};

        CAllocator(const CAllocator &other) : size(other.size), data(other.data) {}

        template<typename U>
        struct rebind {typedef CAllocator<U> other;};

        pointer allocate(size_type n, const void* hint = 0) {return &data[0];}
        void deallocate(void* ptr, size_type n) {}
        size_type max_size() const {return size;}
};

template <typename T, typename U>
inline bool operator == (const CAllocator<T>&, const CAllocator<U>&) {return true;}

template <typename T, typename U>
inline bool operator != (const CAllocator<T>& a, const CAllocator<U>& b) {return !(a == b);}

struct RepBase
{
    std::size_t		length;
    std::size_t		capacity;
    std::int16_t  	refcount;
};

int main()
{
	typedef std::basic_string<char, std::char_traits<char>, CAllocator<char>> CAString;

    const int size = 1024;
	char ptr[size] = {0};

	CAString str(CAllocator<char>(&ptr[0], size));
	str.append("hello");

    std::cout<<&ptr[sizeof(RepBase)];
}