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 8, The Curiously Recurring Template Pattern

  1. While not very expensive in absolute numbers (a few nanoseconds at most), a virtual function call is several times more expensive than a non-virtual one, and could easily be an order of magnitude or more slower than an inlined function call. The overhead comes from the indirection: a virtual function is always invoked by a function pointer, and the actual function is unknown at compile time and cannot be inlined.
  2. If the compiler knows the exact function that is going to be called, it can optimize away the indirection and may be able to inline the function.
  3. Just like the runtime polymorphic calls are made through the pointer to the base class, the static polymorphic calls must be also made through a pointer or reference to the base class. In the case of CRTP and static polymorphism, the base type is actually a whole collection of types generated by the base class template, one for each derived class. To make a polymorphic...