This Clause describes the contents of the C++ standard library, how a well-formed C++ program makes use of the library, and how a conforming implementation may provide the entities in the library.
The following subclauses describe the definitions ([definitions]), method of description ([description]), and organization ([organization]) of the library. Clause [requirements], Clauses [language.support] through [thread], and Annex [depr] specify the contents of the library, as well as library requirements and constraints on both well-formed C++ programs and conforming implementations.
|[language.support]||Language support library|
|[utilities]||General utilities library|
|[re]||Regular expressions library|
|[atomics]||Atomic operations library|
|[thread]||Thread support library|
The language support library (Clause [language.support]) provides components that are required by certain parts of the C++ language, such as memory allocation ([expr.new], [expr.delete]) and exception processing (Clause [except]).
The diagnostics library (Clause [diagnostics]) provides a consistent framework for reporting errors in a C++ program, including predefined exception classes.
The general utilities library (Clause [utilities]) includes components used by other library elements, such as a predefined storage allocator for dynamic storage management ([basic.stc.dynamic]), and components used as infrastructure in C++ programs, such as a tuples, function wrappers, and time facilities.
The strings library (Clause [strings]) provides support for manipulating text represented as sequences of type char, sequences of type char16_t, sequences of type char32_t, sequences of type wchar_t, and sequences of any other character-like type.
The localization library (Clause [localization]) provides extended internationalization support for text processing.
The containers (Clause [containers]), iterators (Clause [iterators]), and algorithms (Clause [algorithms]) libraries provide a C++ program with access to a subset of the most widely used algorithms and data structures.
The numerics library (Clause [numerics]) provides numeric algorithms and complex number components that extend support for numeric processing. The valarray component provides support for n-at-a-time processing, potentially implemented as parallel operations on platforms that support such processing. The random number component provides facilities for generating pseudo-random numbers.
The input/output library (Clause [input.output]) provides the iostream components that are the primary mechanism for C++ program input and output. They can be used with other elements of the library, particularly strings, locales, and iterators.
The atomic operations library (Clause [atomics]) allows more fine-grained concurrent access to shared data than is possible with locks.