cpp-reflection/include/reflection/proxy.h

//
//  proxy.h
//  reflection
//
//  Created by Sam Jaffe on 7/3/22.
//  Copyright © 2022 Sam Jaffe. All rights reserved.
//

#pragma once

#include <functional>

#include "reflection/forward.h"

namespace reflection {
template <typename T> class Proxy {
public:
  template <typename O>
  Proxy(O & obj, T (O::*get)() const, void (O::*set)(T))
      : data_((obj.*get)()), set_([&obj, set](auto & v) { (obj.*set)(v); }) {}
  
  template <typename O>
  Proxy(O & obj, T O::*member, void (O::*set)(T))
      : data_(obj.*member), set_([&obj, set](auto & v) { (obj.*set)(v); }) {}

  template <typename O, typename Get, typename Set>
  Proxy(O & obj, Get get, Set set)
      : data_(get(obj)), set_([&obj, set](auto & v) { set(obj, v); }) {}

  ~Proxy() { set_(data_); }

  operator T &() { return data_; }

private:
  T data_;
  std::function<void(T const &)> set_;
};
}