#include <iostream>
#include <cstring>
 
template <typename T>
class Deleter
{
public:
    void operator()(T* ptr) const {
        std::cout << "freeing memory using 'delete'...\n";
        delete ptr;
    }
};
 
template <typename T>
class Deleter<T[]>
{
public:
    template <typename U>
    void operator()(U* ptr) const {
        std::cout << "freeing memory using 'delete[]'...\n";
        delete[] ptr;
    }
};
 
int main()
{
    int* pi = new int(7);
    char* cp = new char[100];
    std::strcpy(cp, "hi there!");
 
    Deleter<int> del1;
    del1(pi);
 
    Deleter<char[]> del2;
    del2(cp);
 
    std::cout << "\ndone\n";
 
    return 0;
}

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