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  1. #include <map>
  2. #include <cstdio>
  3.  
  4. class NotCopyable
  5.     {
  6. 	public:
  7. 		NotCopyable(char key):m_x(key){}
  8. 		NotCopyable(NotCopyable&& a)
  9. 			{
  10. 			printf("create %p from %p\n",this,&a);
  11. 			m_x=a.m_x;
  12. 			}
  13.  
  14. 		NotCopyable& operator=(NotCopyable&& a)
  15. 			{
  16. 			printf("move %p into %p\n",&a,this);
  17. 			return *this;
  18. 			}
  19. 		bool operator<(const NotCopyable& nc) const
  20. 			{return m_x<nc.m_x;}
  21. 		char m_x;
  22. 	};
  23.  
  24. int main()
  25. 	{
  26. 	std::map<NotCopyable,int> my_map;
  27. 	my_map.insert(std::pair<NotCopyable,int>('A',1));
  28. 	my_map.insert(std::pair<NotCopyable,int>('B',2));
  29. 	my_map.insert(std::pair<NotCopyable,int>('C',3));
  30.  
  31. 	auto i=my_map.begin();
  32. 	while(i!=my_map.end())
  33. 		{
  34. 		printf("'%c' =>  %d\n",i->first.m_x,i->second);
  35. 		NotCopyable foo=std::move( *((NotCopyable*)(&i->first)) ); 
  36. 		++i;
  37. 		}
  38.  
  39. 	return 0;
  40. 	}
  41.  
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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create 0x8171018 from 0xbfc0cd80
create 0x8171038 from 0xbfc0cd80
create 0x8171058 from 0xbfc0cd80
'A' =>  1
create 0xbfc0cd80 from 0x8171018
'B' =>  2
create 0xbfc0cd80 from 0x8171038
'C' =>  3
create 0xbfc0cd80 from 0x8171058
https://ideone.com/fbmeRL
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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