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  1. #include <functional>
  2. #include <iostream>
  3.  
  4. struct foo {
  5. 	foo* m_objID;
  6. 	foo() : m_objID(this) { }
  7.  
  8. 	double operator()(int a, long b) { return a + b; }
  9.  
  10. 	/// 等値演算子☆彡
  11. 	bool operator==(const foo& rhs) {
  12. 		std::cout << __FUNCTION__ << ": this->m_objID=" << m_objID << ", rhs.m_objID=" << rhs.m_objID << std::endl;
  13. 		return (this->m_objID == rhs.m_objID);
  14. 	}
  15. };
  16.  
  17. int main(void) {
  18. 	foo quuux;
  19. 	foo quuuux;
  20. 	std::function<double(int, long)> gfred = quuux;
  21.  
  22. 	std::cout << "value=" << (*gfred.target<foo>())(10, 200L) << std::endl;		// "value=210" と表示される(意図通りｲｺﾞｲﾀ
  23.  
  24. 	if (&*gfred.target<foo>() == &quuux) {
  25. 		std::cout << "gfred is quuux" << std::endl;			// 表示されない
  26. 	}
  27. 	if (*gfred.target<foo>() == quuux) {
  28. 		std::cout << "gfred equals quuux" << std::endl;		// "gfred equals quuux" と表示される(ようになた
  29. 	}
  30. 	if (*gfred.target<foo>() == quuuux) {
  31. 		std::cout << "gfred equals quuuux" << std::endl;	// 表示されない
  32. 	}
  33.  
  34. 	// 等値演算子☆彡のテスト
  35. 	// 以下の結果を見る限り、等値演算子☆彡自体は正しく動いている。
  36. 	if (quuux == quuux) {
  37. 		std::cout << "quuux == quuux" << std::endl;			// "quuux == quuux" と表示される
  38. 	}
  39. 	if (quuux == quuuux) {
  40. 		std::cout << "quuux == quuuux" << std::endl;		// 表示されない
  41. 	}
  42. }
  43.  
Success #stdin #stdout 0.01s 5332KB
comments (?)
stdin 
Standard input is empty
stdout 
value=210
operator==: this->m_objID=0x7fff039906a0, rhs.m_objID=0x7fff039906a0
gfred equals quuux
operator==: this->m_objID=0x7fff039906a0, rhs.m_objID=0x7fff039906a8
operator==: this->m_objID=0x7fff039906a0, rhs.m_objID=0x7fff039906a0
quuux == quuux
operator==: this->m_objID=0x7fff039906a0, rhs.m_objID=0x7fff039906a8
https://ideone.com/sug3S4
language:
C++14 (gcc 8.3)
created:
110 days ago
visibility:
secret

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