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

Introducing local buffer optimization

The least amount of work a program can do to accomplish a certain task is no work at all. Free stuff is great. Similarly, the fastest way to allocate and deallocate memory is this - don’t. Local buffer optimization is a way to get something for nothing; in this case, to get some memory for no additional computing cost.

The main idea

To understand local buffer optimization, you have to remember that memory allocations do not happen in isolation. Usually, if a small amount of memory is needed, the allocated memory is used as a part of some data structure. For example, let’s consider a very simple character string:

// Example 04
class simple_string {
  public:
  simple_string() = default;
  explicit simple_string(const char* s) : s_(strdup(s)) {}
  simple_string(const simple_string& s)
    : s_(strdup(s.s_)) {}
  simple_string& operator=(const char...