The Visitor pattern, as we have seen it so far, does what we wanted it to do. It separates the implementation of the algorithm from the object that is the data for the algorithm, and it allows us to select the correct implementation based on two run-time factors—the specific object type and the concrete operation we want to perform, both of which are selected from their corresponding class hierarchies. There is, however, a fly in the ointment—we wanted to reduce complexity and simplified the code maintenance, and we did, but now we have to maintain two parallel class hierarchies, the visitable objects, and the visitors, and the dependencies between the two are non-trivial. The worst part of these dependencies is that they form a cycle—the Visitor object depends on the types of the visitable objects (there is an overload of the visit() methods...
Hands-On Design Patterns with C++
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Hands-On Design Patterns with C++
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Overview of this book
C++ is a general-purpose programming language designed with the goals of efficiency, performance, and flexibility in mind. 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.
The focus of this book is on the design patterns that naturally lend themselves to the needs of a C++ programmer, and on the patterns that uniquely benefit from the features of C++, in particular, the generic programming. Armed with the knowledge of these patterns, you will spend less time searching for a solution to a common problem and be familiar with the solutions developed from experience, as well as their advantages and drawbacks. The other use of design patterns is as a concise and an efficient way to communicate. A pattern is a familiar and instantly recognizable solution to specific problem; through its use, sometimes with a single line of code, we can convey a considerable amount of information. The code conveys: "This is the problem we are facing, these are additional considerations that are most important in our case; hence, the following well-known solution was chosen."
By the end of this book, you will have gained a comprehensive understanding of design patterns to create robust, reusable, and maintainable code.
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Hands-On Design Patterns with C++
Table of Contents (21 chapters)
Preface
Free Chapter
An Introduction to Inheritance and Polymorphism
Class and Function Templates
Memory Ownership
Swap - From Simple to Subtle
A Comprehensive Look at RAII
Understanding Type Erasure
SFINAE and Overload Resolution Management
The Curiously Recurring Template Pattern
Named Arguments and Method Chaining
Local Buffer Optimization
ScopeGuard
Friend Factory
Virtual Constructors and Factories
The Template Method Pattern and the Non-Virtual Idiom
Singleton - A Classic OOP Pattern
Policy-Based Design
Adapters and Decorators
The Visitor Pattern and Multiple Dispatch
Assessments
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