Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: “We sort the numericalData vector and calculate the median based on size and values”

A block of code is set as follows:

#include <iostream>
#include <vector>
#include <algorithm>
#include <map>

Any command-line input or output is written as follows:

std::unique_ptr<Base> ptr =     std::make_unique_default_init<Derived> ();
ptr->test();

Tips or important notes

Appear like this.