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

Using Arrays

As the name suggests, a C++ built-in array is zero or more items of data of the same type. In C++, square brackets are used to declare arrays and to access array elements:

    int squares[4]; 
    for (int i = 0; i < 4; ++i)  
        squares[i] = i * i; 

The squares variable is an array of integers. The first line allocates enough memory for four integers and then the for loop initializes the memory with the first four squares. The memory allocated by the compiler from the stack is contiguous and the items in the array are sequential, so the memory location of squares[3] is sizeof(int) following on from squares[2]. Since the array is created on the stack, the size of the array is an instruction to the compiler; this is not dynamic allocation, so the size has to be a constant.

There is a potential problem here: the size of the array is mentioned twice, once in the declaration and then again in the for loop. If you use two different values, then you may initialize...