patterns.cpp

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#include <bits/stdc++.h>
 
using namespace std;
 
template <typename ValueType>
struct Setter_interface {
    virtual void set(ValueType i) = 0;
    virtual ~Setter_interface() = default;
};
 
template <typename ValueType>
struct Getter_interface {
    virtual ValueType get() const = 0;
    virtual ~Getter_interface() = default;
};
 
template <typename ValueType>
struct Change_interface {
    virtual void change(ValueType c) = 0;
    virtual ~Change_interface() = default;
};