C++ System Programming Cookbook

How to do it...

In this section, we will develop a concrete template example using concepts:

1. We want to create our own version of the std::sort template function from the C++ standard library. Let's start by writing the following code in a .cpp file:

#include <algorithm>#include <concepts>namespace sp{    template<typename T>        requires Sortable<T>    void sort(T& container)    {        std::sort (begin(container), end(container));    };}

2. Now, let's use our new template class with the constraint that the type we pass, an std::vector, must be sortable; otherwise, the compiler will notify us:

int main(){    std::vector<int> myVec {2,1,4,3};    sp::sort(vec);    return 0;}

We'll look at the details in the next section.