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  1. #include <iostream>
  2. #include <string>
  3.  
  4. using namespace std;
  5.  
  6. class Tank {
  7. private:
  8.     int maximalstand;
  9. 	int fuellstand;
  10.  
  11. public:
  12. 	Tank(int maximalstand) : maximalstand(maximalstand), fuellstand(maximalstand) {}
  13.  
  14. 	void volltanken() {
  15. 		fuellstand=maximalstand;
  16. 	}
  17.  
  18. 	void verbrauchen(int liter) {
  19. 		fuellstand-=liter;
  20. 		if(fuellstand < 0) {
  21. 			fuellstand=0;
  22. 			throw "Der Tank ist leer";
  23. 		}
  24. 	}
  25. };
  26.  
  27. template<typename Config>
  28. class TankProvider : public Config {
  29. public:
  30. 	TankProvider(int liter) : Config(liter) {}
  31. };
  32.  
  33. template<typename Next>
  34. class TankProviderVolltanken : public Next {
  35. public:
  36. 	TankProviderVolltanken(int liter) : Next(liter) {}
  37. 	void volltanken() {
  38. 		this->getTank().volltanken();
  39. 	}
  40. };
  41.  
  42. template<typename Next>
  43. class TankProviderVerbrauchen : public Next {
  44. public:
  45. 	TankProviderVerbrauchen(int liter) : Next(liter) {}
  46.  
  47. 	void verbrauchen(int liter) {
  48. 		this->getTank().verbrauchen(liter);
  49. 	}
  50. };
  51.  
  52.  
  53. template<typename Tank>
  54. class TankProviderBase {
  55. private:
  56. 	Tank impl;
  57. protected:
  58. 	Tank& getTank() {
  59. 		return impl;
  60. 	}
  61.  
  62. 	Tank const& getTank() const {
  63. 		return impl;
  64. 	}
  65.  
  66. 	TankProviderBase(int maximalstand) : impl(maximalstand) {}
  67. };
  68.  
  69. class Auto : public TankProvider<TankProviderVolltanken<TankProviderBase<Tank> > > {
  70. private:
  71.  
  72. public:
  73.  
  74. 	Auto() : TankProvider(75) { }
  75.  
  76. 	void fahren(int km) {
  77. 		//pro 10km 1 liter
  78. 		int verbrauch = km/10;
  79. 		getTank().verbrauchen(verbrauch);
  80. 	}
  81. };
  82.  
  83. int main() {
  84. 	Auto merzedes;
  85.  
  86. 	merzedes.volltanken();
  87. 	try {
  88. 		while(1) {
  89. 			merzedes.fahren(10);
  90. 		}
  91. 	} catch(...) {
  92. 		cout<<"Tank leer\n";
  93. 	}
  94. }
Success #stdin #stdout 0s 2984KB
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Tank leer
https://ideone.com/sPY3Xs
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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