Checking if an input is within its range of limits in C++ -

i need create multiple functions check if input valid or not. here of codes:

bool isvalidrange(signed char s) {     bool isvalid = true;     if (!((s>=schar_min)&&(s<=schar_max)))     {         isvalid = false;     }     return isvalid; }  bool isvalidrange(int s) {     bool isvalid = true;     if (!((s>=int_min)&&(s<=int_max)))     {         isvalid = false;     }     return isvalid; } 

i'm using header limits.h this. doing right way? please take note i'm beginner. hope understand. thank you!

the template above not work mixture of signed , unsigned types, in addition floats.

template<typename rangetype, typename valuetype > bool isinrange( valuetype value )  {     if( ! numeric_limits<rangetype>::is_integer )     {         return  (value > 0 ? value  : -value) <= numeric_limits<rangetype>::max();      }      if ( numeric_limits<rangetype>::is_signed ==           numeric_limits<valuetype>::is_signed )     {         return value >= numeric_limits<rangetype>::min() &&                value <= numeric_limits<rangetype>::max();     }     else if( numeric_limits<rangetype>::is_signed )     {         return value <= numeric_limits<rangetype>::max();     }     else     {         return value >= 0 && value <=  numeric_limits<rangetype>::max();     } }