modules/mod2/mod2price.cpp

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

module;

#include <vector>    // gcc needs this

module Mod2;         // implementation unit of module Mod2

import :Order;       // import internal partition Order

double Customer::sumPrice() const
{
  double sum = 0.0;
  for (const Order& od : orders) {  // ERROR with VC++
  //for (const auto& od : orders) { // OK
    sum += od.count * od.price;
  }
  return sum;
}

double Customer::averagePrice() const
{
  if (orders.empty()) {
    return 0.0;
  }
  return sumPrice() / orders.size();
}