Chapter 1, An Introduction to Inheritance and Polymorphism, provides a brief overview of the object-oriented features of C++. This chapter is not intended as a reference for object-oriented programming in C++, but, rather, highlights the aspects of it that are important for the subsequent chapters.
Chapter 2, Class and Function Templates, provides an overview of the generic programming facilities of C++—class templates, function templates, and lambda expressions. This chapter covers template instantiations and specializations, along with template function argument deduction and overload resolution, and prepares you for more complex uses of templates in later chapters.
Chapter 3, Memory Ownership, describes modern idiomatic ways of expressing different kinds of memory ownership in C++. This is a collection of conventions or idioms—the compiler does not enforce these rules, but programmers will find it easier to understand each other if they use the shared idiomatic vocabulary.
Chapter 4, Swap - From Simple to Subtle, explores one of the most basic C++ operations, the swap, or exchange, of two values. This operation has surprisingly complex interactions with other C++ features that are discussed in the chapter.
Chapter 5, A Comprehensive Look at Resource Acquisition is Initialization, explores in detail one of the fundamental concepts of C++, that of resource management, and introduces what may be the most popular C++ idiom, RAII, which is the standard C++ approach to managing resources.
Chapter 6, Understanding Type Erasure, provides insight into a C++ technique that has been available in C++ for a long time, but has grown in popularity and importance since the introduction of C++11. Type erasure allows the programmer to write abstract programs that do not explicitly mention certain types.
Chapter 7, SFINAE and Overload Resolution Management, discusses SFINAE—a C++ idiom that is, on the one hand, essential to the use of templates in C++ and just happens transparently, while on the other hand, requires a very thorough and subtle understanding of C++ templates when used purposefully.
Chapter 8, The Curiously Recurring Template Pattern, describes a mind-wrapping template-based pattern that combines the benefits of object-oriented programming with the flexibility of templates. The chapter explains the pattern and teaches you how to use it properly to solve practical problems. Lastly, this chapter prepares you for recognizing this pattern in later chapters.
Chapter 9, Named Arguments and Method Chaining, covers an unusual technique for calling functions in C++, using named arguments instead of positional ones. This is another one of those idioms we use implicitly in every C++ program, but its explicit purposeful use takes some thought.
Chapter 10, Local Buffer Optimization, is the only purely performance-oriented chapter in this book. Performance and efficiency are critical considerations that influence every design decision that affects the language itself—there is not a feature in the language that was not reviewed from the point of view of efficiency before being accepted into the standard. It is only fair that a chapter is dedicated to a common idiom used to improve the performance of C++ programs.
Chapter 11, ScopeGuard, introduces an old C++ pattern that has changed almost beyond recognition with the recent versions of C++. The chapter teaches you about a pattern for easily writing exception-safe, or, more generally, error-safe code in C++.
Chapter 12, Friend Factory, describes another old pattern that finds new uses in modern C++. This pattern is used to generate functions associated with templates, such as arithmetic operators for every type generated by a template.
Chapter 13, Virtual Constructors and Factories, covers another classic object-oriented programming pattern as applied to C++, the Factory pattern. In the process, the chapter also shows you how to get the appearance of polymorphic behavior from C++ constructors, even though constructors cannot be virtual.
Chapter 14, The Template Method Pattern and the Non-Virtual Idiom, describes an interesting crossover between a classic object-oriented pattern, the template, and a very C++-centric idiom. Together, they form a pattern that describes the optimal use of virtual functions in C++.
Chapter 15, Singleton, a Classic OOP Pattern, explains another classic object-oriented pattern, the Singleton, as it applies to C++. The chapter discusses when the pattern can be reasonably applied and when it should be avoided, and demonstrates several common implementations of the Singleton.
Chapter 16, Policy-Based Design, covers one of the jewels of C++ design patterns, the Policy pattern (more commonly known as the Strategy pattern), applied at compile time, that is, as a generic programming pattern instead of an object-oriented pattern.
Chapter 17, Adapters and Decorators, discusses the two very broad and closely related patterns as they apply to C++. The chapter considers the use of these patterns in object-oriented designs, as well as in generic programs.
Chapter 18, Visitor and Multiple Dispatch, rounds off our gallery of the classic object-oriented programming patterns with the perennially popular Visitor pattern. The chapter explains the pattern itself, then focuses on the ways that modern C++ makes the implementation of Visitor simpler, more robust, and less error-prone.
