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Hands-On Design Patterns with C++

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

By : Fedor G. Pikus
4.5 (11)
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Hands-On Design Patterns with C++

Hands-On Design Patterns with C++

4.5 (11)
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)
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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

Compile-time Visitor

In this section, we will analyze the possibility of using the Visitor pattern at compile time, in a similar fashion to, say, the application of the Strategy pattern that leads to policy-based design.

First of all, the multiple dispatch aspect of the Visitor pattern becomes trivial when used in the template context:

template <typename T1, typename T2> auto f(T1 t1, T2 t2);

A template function can easily run a different algorithm for any combination of the T1 and T2 types. Unlike the run-time polymorphism implemented with virtual functions, dispatching the call differently based on two or more types comes at no extra cost (other than writing code for all the combinations we need to handle, of course). Based on this observation, we can easily mimic the classic Visitor pattern at compile time:

// Example 18
class Pet {
  std::string color_;
  public:
  Pet(std::string_view color) : color_(color) {}
  const std...
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Hands-On Design Patterns with C++
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