The following code example is taken from the book
C++20 - The Complete Guide
by Nicolai M. Josuttis,
Leanpub, 2021
The code is licensed under a
Creative Commons Attribution 4.0 International License.
// raw code
#include <iostream>
#include <cmath>
template<double Vat>
int addTax(int value)
{
return static_cast<int>(std::round(value * (1 + Vat)));
}
int main()
{
std::cout << addTax<0.19>(100) << '\n';
std::cout << addTax<0.19>(4199) << '\n';
std::cout << addTax<0.07>(1950) << '\n';
}