move_by_copy.h

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#pragma once
 
#include <utility>
 
namespace move_by_copy_util {
  template <class T>
  class MoveByCopy {
  public:
    typedef T move_type;
 
  private:
    move_type _to_move;
 
  public:
    explicit MoveByCopy(move_type &&to_move):
        _to_move(std::move(to_move)) {}
 
    MoveByCopy(MoveByCopy &&other) = default;
 
    MoveByCopy(const MoveByCopy &other) {
      *this = other;
    }
 
    MoveByCopy &
    operator=(MoveByCopy &&other) = default;
 
    MoveByCopy &
    operator=(const MoveByCopy &other) {
      this->_to_move = std::move(const_cast<MoveByCopy &>(other)._to_move);
 
      return *this;
    }
 
    operator move_type() {
      return std::move(_to_move);
    }
  };
 
  template <class T>
  MoveByCopy<T>
  cmove(T &movable) {
    return MoveByCopy<T>(std::move(movable));
  }
 
  // Do NOT use this unless you are absolutely certain the object to be moved is no longer used by the caller
  template <class T>
  MoveByCopy<T>
  const_cmove(const T &movable) {
    return MoveByCopy<T>(std::move(const_cast<T &>(movable)));
  }
}  // namespace move_by_copy_util