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  1. #include <stdio.h>
  2.  
  3. enum EmptyConstructor
  4. {
  5. 	_EmptyConstructor
  6. };
  7.  
  8. class Foo
  9. {
  10. 	int m_ValueFoo;
  11. public:
  12. 	Foo() : m_ValueFoo( 0 ){ printf("Foo()\n"); }
  13.     Foo(EmptyConstructor e){(void)e;}
  14.     void Initialize( int value )
  15.     {
  16.     	m_ValueFoo = value;
  17.     }
  18.     int GetValue( void ) const { return m_ValueFoo; }
  19. };
  20.  
  21. class A
  22. {
  23. 	Foo m_ValueA;
  24. public:
  25. 	A(){ printf("A()\n"); }
  26.     A(EmptyConstructor e) : m_ValueA(e) {}
  27.     void Initialize( int value )
  28.     {
  29.     	m_ValueA.Initialize( value );
  30.     }
  31.     int GetValueA( void ) const { return m_ValueA.GetValue(); }
  32. };
  33.  
  34. class B : public A
  35. {
  36.   	Foo m_ValueB;
  37. public:
  38. 	B(){ printf("B()\n"); }
  39.     B(EmptyConstructor e) : A(e), m_ValueB(e) {}
  40.     void Initialize( int value )
  41.     {
  42.     	m_ValueB.Initialize( value );
  43.         A::Initialize( value ); // 基底クラスを後から初期化
  44.     }
  45.     int GetValueB( void ) const { return m_ValueB.GetValue(); }
  46. };
  47.  
  48. class C : public B
  49. {
  50.   	Foo m_ValueC_1;
  51.     Foo m_ValueC_2;
  52. public:
  53. 	C(){ printf("C()\n"); }
  54.     C(EmptyConstructor e) : B(e), m_ValueC_1(e), m_ValueC_2(e) {}
  55.     void Initialize( int value )
  56.     {
  57.         m_ValueC_2.Initialize( value ); // 2番目のメンバ変数の初期化
  58.         B::Initialize( value );         // 基底クラスの初期化
  59.     	m_ValueC_1.Initialize( value ); // 1番目のメンバ変数の初期化
  60.     }
  61.     int GetValueC1( void ) const { return m_ValueC_1.GetValue(); }
  62.     int GetValueC2( void ) const { return m_ValueC_2.GetValue(); }
  63. };
  64.  
  65. int main( void )
  66. {
  67. 	// デフォルトコンストラクタによる初期化
  68.     {
  69. 		C c;
  70.     	printf( "%d,%d,%d,%d\n", c.GetValueA(), c.GetValueB(), c.GetValueC1(), c.GetValueC2() );
  71.     }
  72.     // 自由な初期化(Initialize関数)
  73.     {
  74. 		C c( _EmptyConstructor );
  75.         c.Initialize( 9 );
  76.     	printf( "%d,%d,%d,%d\n", c.GetValueA(), c.GetValueB(), c.GetValueC1(), c.GetValueC2() );
  77.     }
  78.     // べつの引数で。
  79.     {
  80. 		C c( _EmptyConstructor );
  81.         c.Initialize( 1111 );
  82.     	printf( "%d,%d,%d,%d\n", c.GetValueA(), c.GetValueB(), c.GetValueC1(), c.GetValueC2() );
  83.     }
  84.     return 0;
  85. }
Success #stdin #stdout 0s 3340KB
comments (?)
stdin
copy 
Standard input is empty
stdout
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Foo()
A()
Foo()
B()
Foo()
Foo()
C()
0,0,0,0
9,9,9,9
1111,1111,1111,1111
https://ideone.com/KxgEvP
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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