Adding the relevant parts of the std::set API

In this recipe, we will learn how to add APIs from std::set to the custom container we created in the first recipe. Specifically, we will learn why std::vector::push_back() and std::vector::emplace_back() do not make sense when used with our custom container that always maintains its internal elements in sorted order.

Getting ready

Before beginning, please ensure that all of the technical requirements are met, including the installation of Ubuntu 18.04 or higher and running the following in a terminal window:

> sudo apt-get install build-essential git cmake

This will ensure that your operating system has the proper tools to compile and execute the examples in this recipe. Once...