#include <iostream>
#include <functional>
 
class Parent
{
private:
    std::function<const std::string(const std::string &)> m_func;
public:
    //Parent();
    Parent(std::function<const std::string(const std::string &)> func) {
        m_func = func;
    };
 
    std::string Execute() {
        return m_func("do it ");
    };
};
class Child : public Parent
{
public:
    Child():Parent( std::bind(&Child::hoge, this, std::placeholders::_1)){};
    const std::string hoge(const std::string &str) {
        return str + " you sould... may be can!";
    };
};
 
int main() {
    Child cld;
    std::cout << cld.Execute() << std::endl;
    return 0;
}

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