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  1. #include <limits>
  2. #include <string>
  3. #include <iostream>
  4.  
  5. using namespace std;
  6.  
  7. template <typename T>
  8. inline bool is_between(const string &str,
  9.                        T min = numeric_limits<T>::min(),
  10.                        T max = numeric_limits<T>::max()) noexcept
  11. {
  12.     try {
  13.         long double value = stold(str);
  14.  
  15.         if (value < min || value > max)
  16.             return false;
  17.     } catch (...) {
  18.         return false;
  19.     }
  20.  
  21.     return true;
  22. }
  23.  
  24. #include <iostream>
  25.  
  26. int main()
  27. {
  28. 	cout << boolalpha;
  29.  
  30. 	// UINT64_MAX -> true
  31. 	cout << is_between<uint64_t>("18446744073709551615") << endl;
  32.  
  33. 	// UINT64_MAX + 1 -> false
  34. 	cout << is_between<uint64_t>("18446744073709551616") << endl;
  35. }
Success #stdin #stdout 0s 3412KB
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stdin
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Standard input is empty
stdout
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true
false
https://ideone.com/LVxweZ
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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