10. Function template example

• Type ValueT will be deduced from the actual call parameters.

• Here, max_val( ) requires availability of operator> for ValueT:

  
  #include <iostream>
  #include <string>
  
  // return bigger ValueT
  template< typename ValueT >
  ValueT const& max_val( ValueT const& a, ValueT const& b )
  {
      return ( a > b ) ? a : b;
  }
  
  int main()
  {
      using namespace std;
      string str_a( "hello" );
      string str_b( "bye" );
      string bigger = max_val( str_a, str_b );
      cout << bigger;
      return 0;
  }
  // Program prints "hello"