/C++/How to define range of numbers inside a if condition in c++

How to define range of numbers inside a if condition in c++

template <int min, int max> class range {
  static bool contains(int i) { return min <= i  && i < max; } // In C++, ranges usually are half-open.
};

int age = 23;
if (range<18,30>::contains(age)) { 
//Your desired code
}

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