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();
}