Those types are not “abstract”; they are as real as int and float.
– Doug McIlroy
• Class Basics
Member Functions; Default Copying; Access Control; class and struct; Constructors; explicit Constructors; In-Class Initializers; In-Class Function Definitions; Mutability; Self-Reference; Member Access; static Members; Member Types
• Concrete Classes
Member Functions; Helper Functions; Overloaded Operators; The Significance of Concrete Classes
C++ classes are a tool for creating new types that can be used as conveniently as the built-in types. In addition, derived classes (§3.2.4, Chapter 20) and templates (§3.4, Chapter 23) allow the programmer to express (hierachical and parametric) relationships ...