Book Image

Modern C++: Efficient and Scalable Application Development

By : Richard Grimes, Marius Bancila
Book Image

Modern C++: Efficient and Scalable Application Development

By: Richard Grimes, Marius Bancila

Overview of this book

C++ is one of the most widely used programming languages. It is fast, flexible, and used to solve many programming problems. This Learning Path gives you an in-depth and hands-on experience of working with C++, using the latest recipes and understanding most recent developments. You will explore C++ programming constructs by learning about language structures, functions, and classes, which will help you identify the execution flow through code. You will also understand the importance of the C++ standard library as well as memory allocation for writing better and faster programs. Modern C++: Efficient and Scalable Application Development deals with the challenges faced with advanced C++ programming. You will work through advanced topics such as multithreading, networking, concurrency, lambda expressions, and many more recipes. By the end of this Learning Path, you will have all the skills to become a master C++ programmer. This Learning Path includes content from the following Packt products: • Beginning C++ Programming by Richard Grimes • Modern C++ Programming Cookbook by Marius Bancila • The Modern C++ Challenge by Marius Bancila
Table of Contents (24 chapters)
Title Page
About Packt
Math Problems
Language Features
Strings and Regular Expressions
Streams and Filesystems
Date and Time
Algorithms and Data Structures

Working with pairs and tuples

In many cases you will want to associate two items together; for example, an associative container allows you to create a type of array where items other than numbers are used as an index. The <utility> header file contains a templated class called pair, which has two data members called first and second.

    template <typename T1, typename T2> 
    struct pair 
        T1 first; 
        T2 second; 
        // other members 

Since the class is templated, it means that you can associate any items, including pointers or references. Accessing the members is simple since they are public. You can also use the get templated function, so for a pair object p you can call get<0>(p) rather than p.first. The class also has a copy constructor, so that you can create an object from another object, and a move constructor. There is also a function called make_pair that will deduce the types of the members from the parameters:

    auto name_age...