Pairs, Tuples, and Structured Bindings
Explore how to efficiently group multiple values with std::pair and std::tuple in modern C++. Learn to return multiple values from functions and simplify data access using structured bindings. Understand when to use these tools for temporary groupings to write clearer and more maintainable code.
In some situations, a function needs to return multiple values; for example, a success indicator along with a result, or a small collection of related values such as coordinates. Creating a dedicated struct or class for these short-lived groupings can feel unnecessarily heavy. In earlier versions of C++, handling such cases was awkward and often required verbose syntax or indirect access through helper functions.
Modern C++ provides a more elegant solution. It allows related values to be grouped together temporarily and, just as importantly, unpacked immediately into clear, well-named variables. In this lesson, we'll examine the tools that enable efficient data grouping and explore how structured bindings simplify the handling of multi-value returns and container iteration.
Simple grouping with std::pair
The simplest way to group two values is std::pair, defined in the <utility> header. A pair holds exactly two distinct values, which can be of different types. We access these values using the member variables .first and .second.
In C++20/23, we rarely need to ...