C++20 STL Cookbook/

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Modify Containers with std::transform

Modify Containers with std::transform

Learn to modify containers with std::transform.

We'll cover the following...

The std::transform() function is remarkably powerful and flexible. One of the more commonly deployed algorithms in the library, it applies a function or lambda to each element in a container, storing the results in another container while leaving the original in place.

How to do it

In this recipe, we will explore a few applications for the std::transform() function:

  • We'll start with a simple function that prints the contents of a container:

void printc(auto& c, string_view s = "") {
    if(s.size()) cout << format("{}: ", s);
    for(auto e : c) cout << format("{} ", e);
    cout << '\n';
}
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