| [Algorithms](./algorithms.md) | [\<algorithm>](algorithm.md), [\<cstdlib>](cstdlib.md), [\<numeric>](numeric.md) |

| Atomic operations | [\<atomic>](atomic.md)¹¹ |

| C library wrappers | [\<cassert>](cassert.md), [\<ccomplex>](ccomplex.md)^{11 a b}, [\<cctype>](cctype.md), [\<cerrno>](cerrno.md), [\<cfenv>](cfenv.md)¹¹, [\<cfloat>](cfloat.md), [\<cinttypes>](cinttypes.md)¹¹, [\<ciso646>](ciso646.md)^b, [\<climits>](climits.md), [\<clocale>](clocale.md), [\<cmath>](cmath.md), [\<csetjmp>](csetjmp.md), [\<csignal>](csignal.md), [\<cstdalign>](cstdalign.md)^{11 a b}, [\<cstdarg>](cstdarg.md), [\<cstdbool>](cstdbool.md)^{11 a b}, [\<cstddef>](cstddef.md), [\<cstdint>](cstdint.md)¹¹, [\<cstdio>](cstdio.md), [\<cstdlib>](cstdlib.md), [\<cstring>](cstring.md), [\<ctgmath>](ctgmath.md)^{11 a b}, [\<ctime>](ctime.md), [\<cuchar>](cuchar.md)¹¹, [\<cwchar>](cwchar.md), [\<cwctype>](cwctype.md) |

| Concepts | \<concepts>²⁰ |

| Sequence containers | [\<array>](array.md)¹¹, [\<deque>](deque.md), [\<forward_list>](forward-list.md)¹¹, [\<list>](list.md), [\<vector>](vector.md) |

| Ordered associative containers| [\<map>](map.md), [\<set>](set.md) |

| Unordered associative containers | [\<unordered_map>](unordered-map.md)¹¹, [\<unordered_set>](unordered-set.md)¹¹ |

| Container adaptors | [\<queue>](queue.md), [\<stack>](stack.md) |

| Container views | [\<span>](span.md)²⁰ |

| [Errors and exception handling](../cpp/errors-and-exception-handling-modern-cpp.md) | [\<cassert>](cassert.md), [\<exception>](exception.md), [\<stdexcept>](stdexcept.md), [\<system_error>](system-error.md)¹¹ |

| General utilities | \<any>¹⁷, [\<bit>](bit.md)²⁰, [\<bitset>](bitset.md), [\<cstdlib>](cstdlib.md), \<execution>¹⁷, [\<functional>](functional.md), [\<memory>](memory.md), \<memory_resource>¹⁷, \<optional>¹⁷, [\<ratio>](ratio.md)¹¹, [\<scoped_allocator>](scoped-allocator.md)¹¹, [\<tuple>](tuple.md)¹¹, [\<type_traits>](type-traits.md)¹¹, [\<typeindex>](typeindex.md)¹¹, [\<utility>](utility.md), \<variant>¹⁷ |

| [I/O and formatting](../text/string-and-i-o-formatting-modern-cpp.md) | [\<cinttypes>](cinttypes.md)¹¹, [\<cstdio>](cstdio.md), [\<filesystem>](filesystem.md)¹⁷, [\<fstream>](fstream.md), [\<iomanip>](iomanip.md), [\<ios>](ios.md), [\<iosfwd>](iosfwd.md), [\<iostream>](iostream.md), [\<istream>](istream.md), [\<ostream>](ostream.md), [\<sstream>](sstream.md), [\<streambuf>](streambuf.md), [\<strstream>](strstream.md)^c, \<syncstream>²⁰ |

| Iterators | [\<iterator>](iterator.md) |

| Language support | [\<cfloat>](cfloat.md), [\<climits>](climits.md), [\<codecvt>](codecvt.md)^{11 a}, \<compare>²⁰, \<contract>²⁰, \<coroutine>²⁰, [\<csetjmp>](csetjmp.md), [\<csignal>](csignal.md), [\<cstdarg>](cstdarg.md), [\<cstddef>](cstddef.md), [\<cstdint>](cstdint.md)¹¹, [\<cstdlib>](cstdlib.md), [\<exception>](exception.md), [\<initializer_list>](initializer-list.md)¹¹, [\<limits>](limits.md), [\<new>](new.md), [\<typeinfo>](typeinfo.md), \<version>²⁰ |

| Localization | [\<clocale>](clocale.md), [\<codecvt>](codecvt.md)^{11 a}, [\<cvt/wbuffer>](cvt-wbuffer.md), [\<cvt/wstring>](cvt-wstring.md), [\<locale>](locale.md) |

| Math and numerics | \<bit>²⁰, [\<cfenv>](cfenv.md)¹¹, [\<cmath>](cmath.md), [\<complex>](complex.md), [\<cstdlib>](cstdlib.md), [\<limits>](limits.md), [\<numeric>](numeric.md), [\<random>](random.md)¹¹, [\<ratio>](ratio.md)¹¹, [\<valarray>](valarray.md) |

| [Memory management](../cpp/smart-pointers-modern-cpp.md) | [\<allocators>](allocators-header.md), [\<memory>](memory.md), \<memory_resource>¹⁷, [\<new>](new.md), [\<scoped_allocator>](scoped-allocator.md)¹¹ |

| Multithreading | [\<atomic>](atomic.md)¹¹, [\<condition_variable>](condition-variable.md)¹¹, [\<future>](future.md)¹¹, [\<mutex>](mutex.md)¹¹, [\<shared_mutex>](shared-mutex.md)¹⁴, [\<thread>](thread.md)¹¹ |

| Ranges | \<ranges>²⁰ |

| Regular expressions | [\<regex>](regex.md)¹¹ |

| Strings and character data | [\<charconv>](charconv.md)¹⁷, [\<cctype>](cctype.md), [\<cstdlib>](cstdlib.md), [\<cstring>](cstring.md), [\<cuchar>](cuchar.md)¹¹, [\<cwchar>](cwchar.md), [\<cwctype>](cwctype.md), [\<regex>](regex.md)¹¹, [\<string>](string.md), [\<string_view>](string-view.md)¹⁷ |

| Time | [\<chrono>](chrono.md)¹¹, [\<ctime>](ctime.md) |

|[Algorithms](./algorithms.md)|[\<algorithm>](algorithm.md)|

|C library wrappers|[\<cassert>](cassert.md), [\<cctype>](cctype.md), [\<cerrno>](cerrno.md), [\<cfenv>](cfenv.md), [\<cfloat>](cfloat.md), [\<cinttypes>](cinttypes.md), [\<ciso646>](ciso646.md), [\<climits>](climits.md), [\<clocale>](clocale.md), [\<cmath>](cmath.md), [\<csetjmp>](csetjmp.md), [\<csignal>](csignal.md), [\<cstdarg>](cstdarg.md), [\<cstdbool>](cstdbool.md), [\<cstddef>](cstddef.md), [\<cstdint>](cstdint.md), [\<cstdio>](cstdio.md), [\<cstdlib>](cstdlib.md), [\<cstring>](cstring.md), [\<ctgmath>](ctgmath.md), [\<ctime>](ctime.md), [\<cwchar>](cwchar.md), [\<cwctype>](cwctype.md)|

|Sequence containers|[\<array>](array.md), [\<deque>](deque.md), [\<forward_list>](forward-list.md), [\<list>](list.md), [\<vector>](vector.md)|

|Ordered associative containers| [\<map>](map.md), [\<set>](set.md)|

|Unordered associative containers|[\<unordered_map>](unordered-map.md), [\<unordered_set>](unordered-set.md)|

|Adaptor containers|[\<queue>](queue.md), [\<stack>](stack.md)|

|[Errors and exception handling](../cpp/errors-and-exception-handling-modern-cpp.md)|[\<exception>](exception.md), [\<stdexcept>](stdexcept.md), [\<system_error>](system-error.md)|

|[I/O and formatting](../text/string-and-i-o-formatting-modern-cpp.md)|[\<filesystem>](filesystem.md), [\<fstream>](fstream.md), [\<iomanip>](iomanip.md), [\<ios>](ios.md), [\<iosfwd>](iosfwd.md), [\<iostream>](iostream.md), [\<istream>](istream.md), [\<ostream>](ostream.md), [\<sstream>](sstream.md), [\<streambuf>](streambuf.md), [\<strstream>](strstream.md)|

|Iterators|[\<iterator>](iterator.md)|

|Localization|[\<codecvt>](codecvt.md), [\<cvt/wbuffer>](cvt-wbuffer.md), [\<cvt/wstring>](cvt-wstring.md), [\<locale>](locale.md)|

|Math and numerics|[\<complex>](complex.md), [\<limits>](limits.md), [\<numeric>](numeric.md), [\<random>](random.md), [\<ratio>](ratio.md), [\<valarray>](valarray.md)|

|[Memory Management](../cpp/smart-pointers-modern-cpp.md)|[\<allocators>](allocators-header.md), [\<memory>](memory.md), [\<new>](new.md), [\<scoped_allocator>](scoped-allocator.md)|

|Multithreading|[\<atomic>](atomic.md), [\<condition_variable>](condition-variable.md), [\<future>](future.md), [\<mutex>](mutex.md), [\<shared_mutex>](shared-mutex.md), [\<thread>](thread.md)|

|Other utilities|[\<bitset>](bitset.md), [\<chrono>](chrono.md), [\<functional>](functional.md), [\<initializer_list>](initializer-list.md), [\<tuple>](tuple.md), [\<type_traits>](type-traits.md), [\<typeinfo>](typeinfo.md), [\<typeindex>](typeindex.md), [\<utility>](utility.md)|

|Strings and character data|[\<regex>](regex.md), [\<string>](string.md), [\<string_view>](string-view.md)

All C++ library entities are declared or defined in one or more standard headers. This implementation includes two additional headers, \<hash_map> and \<hash_set>, that are not required by the C++ Standard. For a complete list of headers that this implementation supports, see [Header Files Reference](../standard-library/cpp-standard-library-header-files.md).

[\<cstdarg>](../standard-library/cstdarg.md)\

[\<cstddef>](../standard-library/cstddef.md)\

[\<cstdlib>](../standard-library/cstdlib.md) (declaring at least the functions `abort`, `atexit`, and `exit`)\

[\<exception>](../standard-library/exception.md)\

[\<limits>](../standard-library/limits.md)\

[\<new>](../standard-library/new.md)