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  1. #include <exception>
  2. #include <stdexcept>
  3.  
  4. template <class T, T lower, T upper>
  5. class bounded { 
  6.     T val;
  7. public:
  8.     bounded(bounded const &o) : val(o.val) {}
  9.  
  10.     bounded &operator=(T v) { 
  11.         if ( lower < v && v < upper)
  12.             val = v;
  13.         else 
  14.             throw(std::range_error("Value out of range"));
  15.         return *this;
  16.     }
  17.  
  18. 	bounded(T const &v=T()) {
  19. 		if ( lower <= v && v < upper)
  20. 			val = v;
  21. 		else 
  22. 			throw(std::range_error("Value out of range"));
  23. 		val = v;
  24. 	}
  25.     operator T() { return val; }
  26. };
  27.  
  28. //#ifdef TEST
  29. #include <iostream>
  30.  
  31. int main() { 
  32. 	bounded<int, 0, 512> x;
  33.  
  34. 	try { 
  35. 		x = 256;
  36. 		std::cout << x << std::endl;
  37.  
  38. 		x = 1024;
  39. 		std::cout << x << std::endl;
  40. 	}
  41. 	catch(std::exception &e) {
  42. 		std::cerr << "Error: " << e.what() << std::endl;
  43. 	}
  44. 	return 0;
  45. }
  46.  
  47. // #endif
  48.  
Success #stdin #stdout 0.01s 2816KB
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https://ideone.com/ZTLG1
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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