Book Image

Hands-On Design Patterns with C++ (Second Edition) - Second Edition

By : Fedor G. Pikus
5 (1)
Book Image

Hands-On Design Patterns with C++ (Second Edition) - Second Edition

5 (1)
By: Fedor G. Pikus

Overview of this book

C++ is a general-purpose programming language designed for efficiency, performance, and flexibility. Design patterns are commonly accepted solutions to well-recognized design problems. In essence, they are a library of reusable components, only for software architecture, and not for a concrete implementation. This book helps you focus on the design patterns that naturally adapt to your needs, and on the patterns that uniquely benefit from the features of C++. Armed with the knowledge of these patterns, you’ll spend less time searching for solutions to common problems and tackle challenges with the solutions developed from experience. You’ll also explore that design patterns are a concise and efficient way to communicate, as patterns are a familiar and recognizable solution to a specific problem and can convey a considerable amount of information with a single line of code. By the end of this book, you’ll have a deep understanding of how to use design patterns to write maintainable, robust, and reusable software.
Table of Contents (26 chapters)
1
Part 1: Getting Started with C++ Features and Concepts
5
Part 2: Common C++ Idioms
10
Part 3: C++ Design Patterns
18
Part 4: Advanced C++ Design Patterns

Chapter 13, Virtual Constructors and Factories

  1. There are several reasons, but the simplest is that the memory must be allocated in the amount sizeof(T), where T is the actual object type, and the sizeof() operator is constexpr (a compile-time constant).
  2. The Factory pattern is a creational pattern that solves the problem of creating objects without having to explicitly specify the type of the object.
  3. While in C++ the actual type has to be specified at the construction point, the Factory pattern allows us to separate the point of construction from the place where the program has to decide what object to construct and identify the type using some alternative identifier, a number, a value, or another type.
  4. The virtual copy constructor is a particular kind of factory where the object to construct is identified by the type of another object we already have. A typical implementation involves a virtual clone() method that is overridden in every derived class.
  5. The Template...