Our code example consists of three files. The implementation source file, sum_integers.cpp, does the work of summing up over a vector of integers, and returns the sum:
#include "sum_integers.hpp" #include <vector>int sum_integers(const std::vector<int> integers) { auto sum = 0; for (auto i : integers) { sum += i; } return sum;}
For this example, it does not matter whether this is the most elegant implementation of a sum over a vector. The interface is exported to our example library in sum_integers.hpp, as follows:
#pragma once #include <vector>int sum_integers(const std::vector<int> integers);
Finally, the main function is defined in main.cpp, which collects the command-line arguments from argv[], converts them into a vector ...
