md_docs_2test__cases_2t00026.html

#include <iostream>

#include <memory>

#include <unordered_map>


namespace clanguml {

namespace t00026 {


template <typename T> class Memento {

public:

    Memento(T &&v)

        : m_value(std::forward<T>(v))

    {

    }


    T value() const { return m_value; }


private:

    T m_value;

};


template <typename T> class Originator {

public:

    Originator(T &&v)

        : m_value(std::forward<T>(v))

    {

    }


    Memento<T> memoize_value() const { return Memento<T>{m_value}; }


    void load(const Memento<T> &m) { m_value = m.value(); }


    void print() const { std::cout << m_value << std::endl; }


    void set(T &&v) { m_value = std::forward<T>(v); }


private:

    T m_value;

};


template <typename T> class Caretaker {

public:

    Memento<T> &state(const std::string &n) { return m_mementos.at(n); }


    void set_state(const std::string &s, Memento<T> &&m)

    {

        m_mementos.try_emplace(s, std::move(m));

    }


private:

    std::unordered_map<std::string, Memento<T>> m_mementos;

};


struct StringMemento {

    Caretaker<std::string> caretaker;

    Originator<std::string> originator;

};

} // namespace t00026

} // namespace clanguml