Conventions

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words and C++ language keywords in text are shown as follows: "We pass the number of bytes returned by async_receive to the handler."

Folder names, filenames, file extensions, pathnames, include file names in text are shown as follows: "The header file boost/asio.hpp includes most of the types and functions required for using the Asio library".

A block of code is set as follows:

46 int main() {
47   asio::io_service service;
48   UDPAsyncServer server(service, 55000);
49
50   boost::thread_group pool;
51 pool.create_thread([&service] { service.run(); });
52 pool.create_thread([&service] { service.run(); });
53   pool.join_all();
54 }

Except in smaller code snippets, each line of code is numbered for ease of reference from within the text. Important lines of code in a block are highlighted as shown above, and referred to from text using line numbers in parentheses (lines 51-52).

Any command-line input is written as follows:

$ g++ -g listing1.cpp -o listing1 -lboost_system -lboost_coroutine -lboost_date_time -std=c++11

Important new programming terms are shown in bold. Conceptual terms are shown in italics.