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  1. #include <functional>
  2. #include <iostream>
  3.  
  4. struct foo {
  5. 	double operator()(int a, long b) { return a + b; }
  6.  
  7. 	/// 等値演算子☆彡
  8. 	bool operator==(const foo& rhs) {
  9. 		std::cout << __FUNCTION__ << ": this=" << this << ", &rhs=" << &rhs << std::endl;
  10. 		return (this == &rhs);
  11. 	}
  12. };
  13.  
  14. int main(void) {
  15. 	foo quuux;
  16. 	foo quuuux;
  17. 	std::function<double(int, long)> gfred = quuux;
  18.  
  19. 	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
  20.  
  21. 	if (&*gfred.target<foo>() == &quuux) {
  22. 		std::cout << "gfred is quuux" << std::endl;			// 表示されない
  23. 	}
  24. 	if (*gfred.target<foo>() == quuux) {
  25. 		std::cout << "gfred equals quuux" << std::endl;		// "gfred equals quuux" と表示されて欲しいがされない
  26. 	}
  27. 	if (*gfred.target<foo>() == quuuux) {
  28. 		std::cout << "gfred equals quuuux" << std::endl;	// 表示されない
  29. 	}
  30.  
  31. 	// 等値演算子☆彡のテスト
  32. 	// 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。
  33. 	if (quuux == quuux) {
  34. 		std::cout << "quuux == quuux" << std::endl;			// "quuux == quuux" と表示される
  35. 	}
  36. 	if (quuux == quuuux) {
  37. 		std::cout << "quuux == quuuux" << std::endl;		// 表示されない
  38. 	}
  39. }
  40.  
Success #stdin #stdout 0s 5328KB
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stdin
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Standard input is empty
stdout
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value=210
operator==: this=0x7ffe83bbcb90, &rhs=0x7ffe83bbcb8e
operator==: this=0x7ffe83bbcb90, &rhs=0x7ffe83bbcb8f
operator==: this=0x7ffe83bbcb8e, &rhs=0x7ffe83bbcb8e
quuux == quuux
operator==: this=0x7ffe83bbcb8e, &rhs=0x7ffe83bbcb8f
https://ideone.com/VM9Vh0
language:
C++14 (gcc 8.3)
created:
110 days ago
visibility:
secret

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