crtp.cpp

#include <iostream>


template <typename Derived>
struct Base{
    void interface(){
        static_cast<Derived*>(this)->implementation();
    }
    void implementation()
    {
        std::cout << "Implementation Base" << std::endl;
    }
};

struct Derived1: Base<Derived1>{
    void implementation()
    {
        std::cout << "Implementation Derived1" << std::endl;
    }
};

struct Derived2: Base<Derived2>
{
    void implementation()
    {
        std::cout << "Implementation Derived2" << std::endl;
    }
};

struct Derived3: Base<Derived3>{};

template <typename T>
void execute(T& base)
{
    base.interface();
}


int main()
{
    std::cout << std::endl;

    Derived1 d1;
    execute(d1);

    Derived2 d2;
    execute(d2);

    Derived3 d3;
    execute(d3);

    std::cout << std::endl;

    return 0;
}