cpp-variant/variant.cpp

//
//  vairant.cpp
//  variant
//
//  Created by Sam Jaffe on 1/30/16.
//  Copyright © 2016 Sam Jaffe. All rights reserved.
//

#include "variant.hpp"
#include <iostream>

struct test{
  int * holder;
  test() {
    std::cout << "test()" << std::endl;
    holder = new int();
  }
  
  test(test&& old) : holder(nullptr) {
    std::cout << "test(test&&)" << std::endl;
    std::swap(holder,old.holder);
  }
  test(const test& old) {
    std::cout << "test(const test&)" << std::endl;
    holder = new int(*old.holder);
  }
  ~test()
  {
    std::cout << "~test()" << std::endl;
    delete holder;
  }
};


int main() {
  using my_var = variant<std::string, test>;
  
  my_var d{};
  
  d.set<std::string>("First string");
  std::cout << d.get<std::string>() << std::endl;
  
  d.set<test>();
  *d.get<test>().holder = 42;
  
  my_var e(std::move(d));
  std::cout << *e.get<test>().holder << std::endl;
  
  *e.get<test>().holder = 43;
  
  d = e;
  
  std::cout << *d.get<test>().holder << std::endl;
}