The lambda function, introduced in C++11 and further enhanced with polymorphic capabilities in C++14, is one of the most useful features in modern C++. Its versatility comes not only from easily passing functions to algorithms but it can also be used in a lot of circumstances where you need to pass the code around, especially as you can store a lambda function in std::function.
Although the lambda function made these programming techniques vastly simpler to work with, everything here is possible to perform without them by making classes with operator() overloaded.
We will explore the lambda function's similarities to these kind of classes later, but first let's introduce the lambda function in a simple use case.
