C++

23.2    Function Templates in the Standard Library

In the standard library, you will find function templates everywhere. You have already seen some examples, especially from the <algorithm> and <numeric> headers.

The functions from these headers are particularly interesting because they work with the standard containers. If you pass an entire container as a parameter, starting from C++20, it becomes a range (see Chapter 24, Section 24.1.7). Alternatively—and before C++20—you pass a pair of iterators, as in the next listing.

// https://godbolt.org/z/oTn1K4sGG#include <vector>#include <iostream>  // cout, ostream#include <algorithm> // sort, copy#include <iterator>  // ostream_iteratorint main() {    std::ostream_iterator<int> oit(std::cout," ");