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: “The example uses the open() and close() POSIX functions, which try to open and close a file from the filesystem of our Linux test environment.”

A block of code is set as follows:

if (ecode.value() == EEXIST)

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

std::for_each(v1.begin(), v1.end(),
                  [&mean, sum{0.0}, count{0}, text](const double& val) mutable

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

$ ./test

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