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# C++ Standard Library header files

From cppreference.com
< cpp

The interface of C++ standard library is defined by the following collection of header files.

### Utilities library
``<cstdlib>`` | General purpose utilities: program control, dynamic memory allocation, random numbers, sort and search
``<csignal>`` | Functions and macro constants for signal management
``<csetjmp>`` | Macro (and function) that saves (and jumps) to an execution context
``<cstdarg>`` | Handling of variable length argument lists
``<typeinfo>`` | Runtime type information utilities
``<typeindex>`` (since C++11) | std::type_index
``<type_traits>`` (since C++11) | Compile-time type information
``<bitset>`` | std::bitset class template
``<functional>`` | Function objects, designed for use with the standard algorithms
``<utility>`` | Various utility components
``<ctime>`` | C-style time/date utilites
``<chrono>`` (since C++11) | C++ time utilites
``<cstddef>`` | typedefs for types such as size_t, NULL and others
``<initializer_list>`` (since C++11) | std::initializer_list class template
``<tuple>`` (since C++11) | std::tuple class template
##### Dynamic memory management
``<new>`` | Low-level memory management utilities
``<memory>`` | Higher level memory management utilities
``<scoped_allocator>`` (since C++11) | Nested allocator class
##### Numeric limits
``<climits>`` | limits of integral types
``<cfloat>`` | limits of float types
``<cstdint>`` (since C++11) | fixed-size types and limits of other types
``<cinttypes>`` (since C++11) | formatting macros , `intmax_t` and `uintmax_t` math and conversions
``<limits>`` | standardized way to query properties of fundamental types
##### Error handling
``<exception>`` | Exception handling utilities
``<stdexcept>`` | Standard exception objects
``<cassert>`` | Conditionally compiled macro that compares its argument to zero
``<system_error>`` (since C++11) | defines std::error_code, a platform-dependent error code
``<cerrno>`` | Macro containing the last error number
### Strings library
``<cctype>`` | functions to determine the type contained in character data
``<cwctype>`` | functions for determining the type of wide character data
``<cstring>`` | various narrow character string handling functions
``<cwchar>`` | various wide and multibyte string handling functions
``<cuchar>`` (since C++11) | C-style Unicode character conversion functions
``<string>`` | std::basic_string class template
### Containers library
``<array>`` (since C++11) | std::array container
``<vector>`` | std::vector container
``<deque>`` | std::deque container
``<list>`` | std::list container
``<forward_list>`` (since C++11) | std::forward_list container
``<set>`` | std::set and std::multiset associative containers
``<map>`` | std::map and std::multimap associative containers
``<unordered_set>`` (since C++11) | std::unordered_set and std::unordered_multiset unordered associative containers
``<unordered_map>`` (since C++11) | std::unordered_map and std::unordered_multimap unordered associative containers
``<stack>`` | std::stack container adaptor
``<queue>`` | std::queue and std::priority_queue container adaptors
### Algorithms library
``<algorithm>`` | Algorithms that operate on containers
### Iterators library
``<iterator>`` | Container iterators
### Numerics library
``<cmath>`` | Common mathematics functions
``<complex>`` | Complex number type
``<valarray>`` | Class for representing and manipulating arrays of values
``<random>`` (since C++11) | Random number generators and distributions
``<numeric>`` | Numeric operations on values in containers
``<ratio>`` (since C++11) | Compile-time rational arithmetic
``<cfenv>`` (since C++11) | Floating-point environment access functions
### Input/output library
``<iosfwd>`` | forward declarations of all classes in the input/output library
``<ios>`` | std::ios_base class, std::basic_ios class template and several typedefs
``<istream>`` | std::basic_istream class template and several typedefs
``<ostream>`` | std::basic_ostream class template and several typedefs
``<iostream>`` | std::basic_iostream class template and several typedefs
``<fstream>`` | std::basic_fstream, std::basic_ifstream, std::basic_ofstream class templates and several typedefs
``<sstream>`` | std::basic_stringstream, std::basic_istringstream, std::basic_ostringstream class templates and several typedefs
``<strstream>`` | std::strstream, std::istrstream, std::ostrstream(deprecated)
``<iomanip>`` | Helper functions to control the format or input and output
``<streambuf>`` | std::basic_streambuf class template
``<cstdio>`` | C-style input-output functions
### Localization library
``<locale>`` | Localization utilities
``<clocale>`` | C localization utilities
``<codecvt>`` (since C++11) | Unicode conversion facilities
### Regular Expressions library
``<regex>`` (since C++11) | Classes, algorithms and iterators to support regular expression processing
### Atomic Operations library
``<atomic>`` (since C++11) | Atomic operations library
### Thread support library
``<thread>`` (since C++11) | std::thread class and supporting functions
``<mutex>`` (since C++11) | mutual exclusion primitives
``<shared_mutex>`` (since C++14) | shared mutual exclusion primitives
``<future>`` (since C++11) | primitives for asynchronous computations
``<condition_variable>`` (since C++11) | thread waiting conditions
### C compatibility headers
``<ciso646>`` | empty header. The macros that appear in `iso646.h` in C are keywords in C++
``<ccomplex>`` (since C++11) | simply includes the header <complex>
``<ctgmath>`` (since C++11) | simply includes the headers <ccomplex> and <cmath>: the overloads equivalent to the contents of the C header `tgmath.h` are already provided by <cmath> and <complex>
``<cstdalign>`` (since C++11) | defines one compatibility macro constant
``<cstdbool>`` (since C++11) | defines one compatibility macro constant
### Deprecated headers
`<assert.h>` (deprecated) | behaves as if each name from `<cassert>` is placed in global namespace
`<complex.h>` (deprecated) | behaves as if each name from `<ccomplex>` is placed in global namespace
`<ctype.h>` (deprecated) | behaves as if each name from `<cctype>` is placed in global namespace
`<errno.h>` (deprecated) | behaves as if each name from `<cerrno>` is placed in global namespace
`<fenv.h>` (deprecated) | behaves as if each name from `<cfenv>` is placed in global namespace
`<float.h>` (deprecated) | behaves as if each name from `<cfloat>` is placed in global namespace
`<inttypes.h>` (deprecated) | behaves as if each name from `<cinttypes>` is placed in global namespace
`<iso646.h>` (deprecated) | behaves as if each name from `<ciso646>` is placed in global namespace
`<limits.h>` (deprecated) | behaves as if each name from `<climits>` is placed in global namespace
`<locale.h>` (deprecated) | behaves as if each name from `<clocale>` is placed in global namespace
`<math.h>` (deprecated) | behaves as if each name from `<cmath>` is placed in global namespace
`<setjmp.h>` (deprecated) | behaves as if each name from `<csetjmp>` is placed in global namespace
`<signal.h>` (deprecated) | behaves as if each name from `<csignal>` is placed in global namespace
`<stdalign.h>` (deprecated) | behaves as if each name from `<cstdalign>` is placed in global namespace
`<stdarg.h>` (deprecated) | behaves as if each name from `<cstdarg>` is placed in global namespace
`<stdbool.h>` (deprecated) | behaves as if each name from `<cstdbool>` is placed in global namespace
`<stddef.h>` (deprecated) | behaves as if each name from `<cstddef>` is placed in global namespace
`<stdint.h>` (deprecated) | behaves as if each name from `<cstdint>` is placed in global namespace
`<stdio.h>` (deprecated) | behaves as if each name from `<cstdio>` is placed in global namespace
`<stdlib.h>` (deprecated) | behaves as if each name from `<cstdlib>` is placed in global namespace
`<string.h>` (deprecated) | behaves as if each name from `<cstring>` is placed in global namespace
`<tgmath.h>` (deprecated) | behaves as if each name from `<ctgmath>` is placed in global namespace
`<time.h>` (deprecated) | behaves as if each name from `<ctime>` is placed in global namespace
`<uchar.h>` (deprecated) | behaves as if each name from `<cuchar>` is placed in global namespace
`<wchar.h>` (deprecated) | behaves as if each name from `<cwchar>` is placed in global namespace
`<wctype.h>` (deprecated) | behaves as if each name from `<cwctype>` is placed in global namespace

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