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  1. #include <iostream>
  2.  
  3. class FooException
  4. {
  5. 	int id;
  6. public:
  7. 	FooException(int n) : id(n) {}
  8. 	int getId() const { return id; }
  9. };
  10.  
  11. class Foo;
  12.  
  13. class Bar
  14. {
  15. 	friend Foo;
  16. 	int val;
  17. 	Bar() : val(0) {}
  18. 	Bar(const int v) : val(v) {}
  19. 	Bar(const Bar& b) : val(b.val) {}
  20. 	int getVal() const { return val; }
  21. };
  22.  
  23. class Foo
  24. {
  25. 	Bar *p; 
  26. 	int id;
  27. 	static int num() {
  28. 		static int v = 0;
  29. 		return v++;
  30. 	}
  31. public:
  32. 	Foo() : id(num()), p(NULL) {
  33. 		std::cout << "cons()" << id << std::endl;
  34. 		p = new Bar;
  35. 	}
  36. 	Foo(const int val) : id(num()), p(NULL) {
  37. 		std::cout << "cons(int)" << id << ":" << val <<  std::endl;
  38. 		p = new Bar(val);
  39. 	}
  40. 	explicit Foo(const Foo& f) : id(num()), p(NULL) {
  41. 		std::cout << "cons(Foo)" << id << ":" << f.id << std::endl;
  42. 		p = new Bar(*f.p);
  43. 	}
  44. 	~Foo() {
  45. 		std::cout << "dest()" << id << std::endl;
  46. 		delete p;
  47. 		p = NULL;
  48. 	}
  49. 	Foo& operator = (Foo& f) {
  50. 		std::cout << id << " = " << f.id << std::endl;
  51. 		p->val = f.p->val;
  52. 		return *this;
  53. 	}
  54. 	int getValue() const {
  55. 		if (p) return p->val;
  56. 		throw FooException(id);
  57. 	}
  58. 	int getId() const {
  59. 		return id;
  60. 	}
  61. };
  62.  
  63. Foo& operator + (const Foo& f1, const Foo& f2) {
  64. 	std::cout << f1.getId() << " + " << f2.getId() << std::endl;
  65. 	Foo t(f1.getValue() + f2.getValue());
  66. 	return t; // 先にデストラクタ呼ばれて計算結果渡せないお
  67. }
  68.  
  69. int main() {
  70. 	using namespace std;
  71. 	Foo f1, f2(123);
  72. 	Foo f3(f2), f4, f5;
  73.  
  74. //	f4 = f3; // 謎エラーだお
  75.  
  76. 	f5 = f2 + f3 + f2;
  77.  
  78. 	try {
  79. 		cout << f1.getId() << " ... " <<  f1.getValue() << endl;
  80. 		cout << f2.getId() << " ... " <<  f2.getValue() << endl;
  81. 		cout << f3.getId() << " ... " <<  f3.getValue() << endl;
  82. 		cout << f4.getId() << " ... " <<  f4.getValue() << endl;
  83. 		cout << f5.getId() << " ... " <<  f5.getValue() << endl;
  84. 	} catch (FooException e) {
  85. 		cout << "fooerr" << e.getId() << endl;
  86. 	} catch (...) {
  87. 		cout << "err" << endl;
  88. 	}
  89.  
  90. 	return 0;
  91. }
Success #stdin #stdout 0s 3432KB
comments (?)
stdin
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Standard input is empty
stdout
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cons()0
cons(int)1:123
cons(Foo)2:1
cons()3
cons()4
1 + 2
cons(int)5:246
dest()5
5 + 1
cons(int)6:123
dest()6
4 = 6
0 ... 0
1 ... 123
2 ... 123
3 ... 0
4 ... 920156
dest()4
dest()3
dest()2
dest()1
dest()0
https://ideone.com/NdzbdO
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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