This International Standard specifies requirements for implementations of the C++ programming language. The first such requirement is that they implement the language, and so this International Standard also defines C++.
Other requirements and relaxations of the first requirement appear at various places within this International Standard. C++ is a general purpose programming language based on the C programming language as described in ISO/IEC 9899:1990 Programming languages . C (1.2). In addition to the facilities provided by C, C++ provides additional data types, classes, templates, exceptions, namespaces, inline functions, operator overloading, function name overloading, references, free store management operators, and additional library facilities.