fig15_05.cpp

// fig15_05.cpp
// Constrained multiply function template that allows 
// only integers and floating-point values.
#include <concepts>
#include <iostream>

template<typename T>
   requires std::integral<T> || std::floating_point<T>
T multiply(T first, T second) {return first * second;}

int main() {
   std::cout << "Product of 5 and 3: " << multiply(5, 3)
      << "\nProduct of 7.25 and 2.0: " << multiply(7.25, 2.0) << "\n";

   std::string s1{"hi"};
   std::string s2{"bye"};
   auto result{multiply(s1, s2)};
}


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