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  1. #include <iostream>
  2. #include <functional>
  3. #include <cassert>
  4. using namespace std;
  5.  
  6. template<
  7.     typename T, 
  8.     T minVal, 
  9.     T maxVal, 
  10.     typename Compare = less<T>>
  11. class RangedVal{
  12. public:
  13.     using value_type = T;
  14.     using compare_type = Compare;
  15.     static constexpr value_type min = minVal;
  16.     static constexpr value_type max = maxVal;
  17.     static constexpr compare_type compare = compare_type();
  18.  
  19.     static constexpr bool check(value_type val){
  20.         return compare(min, val) && compare(val, max);
  21.     }
  22. private:
  23.     value_type value;
  24. public:
  25.     constexpr RangedVal(value_type val): value(check(val)? val : throw val){}
  26.  
  27.     constexpr operator value_type() const{
  28.         return value;
  29.     }
  30. };
  31.  
  32. int main() {
  33.     RangedVal<int, 0, 6> val(3);
  34.     cout << val << endl;
  35.     return 0;
  36. }
Success #stdin #stdout 0s 3140KB
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Standard input is empty
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3
https://ideone.com/Ayd3G1
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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