In the C++ programming language, the C++ Standard Library is a collection of classes and functions, which are written in the core language and part of the C++ ISO Standard itself. The C++ Standard Library provides several generic containers, functions to utilize and manipulate these containers, function objects, generic strings and streams (including interactive and file I/O), support for some language features, and everyday functions for tasks such as finding the square root of a number. The C++ Standard Library also incorporates 18 headers of the ISO C90 C standard library ending with ".h", but their use is deprecated. No other headers in the C++ Standard Library end in ".h". Features of the C++ Standard Library are declared within the std namespace.
The C++ Standard Library is based upon conventions introduced by the Standard Template Library (STL). Although the C++ Standard Library and the STL share many features, neither is a strict superset of the other. In particular, the C++ Standard Library has also been influenced by the work of Alexander Stepanov and Meng Lee.
The C++ Standard Library underwent ISO standardization as part of the C++ ISO Standardization effort, and is undergoing further work regarding standardization of expanded functionality.
| C++ Standard Library |
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| Standard Template Library |
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| C standard library |
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