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Using std::pair

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The struct template std::pair can bundle together exactly two return values, of any two types:

#include <utility>
std::pair<int, int> foo(int a, int b) {
    return std::make_pair(a+b, a-b);

With C++11 or later, an initializer list can be used instead of std::make_pair:

#include <utility>
std::pair<int, int> foo(int a, int b) {
    return {a+b, a-b};

The individual values of the returned std::pair can be retrieved by using the pair's first and second member objects:

std::pair<int, int> mrvs = foo(5, 12);
std::cout << mrvs.first + mrvs.second << std::endl;