C++ header files

In this section:

This section lists the C++ header files:

The C++ library header files
The header files that constitute the Standard C++ library.
The C++ C header files
The C++ header files that provide the resources from the C library.

The C++ library header files

This table lists the header files that can be used in C++:

Header file	Usage
`algorithm`	Defines several common operations on containers and other sequences
`any`	Adding support for the `std::any` class. Requires Libc++.
`array`	Adding support for the array sequencer container
`atomic`	Adding support for atomic operations This functionality is not supported.
`bitset`	Defining a container with fixed-sized sequences of bits
`charconv`	Adding support for the `std::to_chars` and `std::from_chars` routines. Requires Libc++.
`chrono`	Adding support for time utilities. Note that the `steady_clock`class in not available in Libc++.
`codecvt`	Adding support for conversions between encodings
`complex`	Defining a class that supports complex arithmetic
`condition_variable`	Adding support for thread condition variables. This functionality is not supported.
`deque`	A deque sequence container
`exception`	Defining several functions that control exception handling
`forward_list`	Adding support for the forward list sequence container
`fstream`	Defining several I/O stream classes that manipulate external files
`functional`	Defines several function objects
`future`	Adding support for passing function information between threads This functionality is not supported.
`hash_map`	A map associative container, based on a hash algorithm. This is a C++14 header—it is not available in Libc++.
`hash_set`	A set associative container, based on a hash algorithm. This is a C++14 header—it is not available in Libc++.
`initializer_list`	Adding support for the `initializer_list` class
`iomanip`	Declaring several I/O stream manipulators that take an argument
`ios`	Defining the class that serves as the base for many I/O streams classes
`iosfwd`	Declaring several I/O stream classes before they are necessarily defined
`iostream`	Declaring the I/O stream objects that manipulate the standard streams
`istream`	Defining the class that performs extractions
`iterator`	Defines common iterators, and operations on iterators
`limits`	Defining numerical values
`list`	A doubly-linked list sequence container
`locale`	Adapting to different cultural conventions
`map`	A map associative container
`memory`	Defines facilities for managing memory
`mutex`	Adding support for the data race protection object `mutex`. This functionality is not supported.
`new`	Declaring several functions that allocate and free storage
`numeric`	Performs generalized numeric operations on sequences
`optional`	Adding support for the `std::optional` class template. Requires Libc++.
`ostream`	Defining the class that performs insertions
`queue`	A queue sequence container
`random`	Adding support for random numbers
`ratio`	Adding support for compile-time rational arithmetic
`regex`	Adding support for regular expressions
`scoped_allocator`	Adding support for the memory resource `scoped_allocator_adaptor`
`set`	A set associative container
`shared_mutex`	Adding support for the data race protection object `shared_mutex`. This functionality is not supported.
`slist`	A singly-linked list sequence container. This is a C++14 header—it is not available in Libc++.
`sstream`	Defining several I/O stream classes that manipulate string containers
`stack`	A stack sequence container
`stdexcept`	Defining several classes useful for reporting exceptions
`streambuf`	Defining classes that buffer I/O stream operations
`string`	Defining a class that implements a string container
`string_view`	Adding support for the `std::basic_string_view` class template. Requires Libc++.
`strstream`	Defining several I/O stream classes that manipulate in-memory character sequences
`system_error`	Adding support for global error reporting
`thread`	Adding support for multiple threads of execution. This functionality is not supported.
`tuple`	Adding support for the `tuple` class
`typeinfo`	Defining type information support
`typeindex`	Adding support for type indexes
`typetraits`	Adding support for traits on types
`unordered_map`	Adding support for the unordered map associative container
`unordered_set`	Adding support for the unordered set associative container
`utility`	Defines several utility components
`valarray`	Defining varying length array container
`variant`	Adding support for the `std::variant` class template. Requires Libc++.
`vector`	A vector sequence container

Table 84. C++ header files

Using Standard C libraries in C++

The C++ library works in conjunction with some of the header files from the Standard C library, sometimes with small alterations. The header files come in two forms—new and traditional—for example, cassert and assert.h. The former puts all declared symbols in the global and std namespace, whereas the latter puts them in the global namespace only.

This table shows the new header files:

Header file	Usage
`cassert`	Enforcing assertions when functions execute
`ccomplex`	Computing common complex mathematical functions
`cctype`	Classifying characters
`cerrno`	Testing error codes reported by library functions
`cfenv`	Floating-point exception flags
`cfloat`	Testing floating-point type properties
`cinttypes`	Defining formatters for all types defined in `stdint.h`
`ciso646`	Alternative spellings
`climits`	Testing integer type properties
`clocale`	Adapting to different cultural conventions
`cmath`	Computing common mathematical functions
`csetjmp`	Executing non-local goto statements
`csignal`	Controlling various exceptional conditions
`cstdalign`	Handling alignment on data objects
`cstdarg`	Accessing a varying number of arguments
`cstdatomic`	Adding support for atomic operations
`cstdbool`	Adds support for the `bool` data type in C.
`cstddef`	Defining several useful types and macros
`cstdint`	Providing integer characteristics
`cstdio`	Performing input and output
`cstdlib`	Performing a variety of operations
`cstdnoreturn`	Adding support for non-returning functions
`cstring`	Manipulating several kinds of strings
`ctgmath`	Type-generic mathematical functions
`cthreads`	Adding support for multiple threads of execution. This functionality is not supported.
`ctime`	Converting between various time and date formats
`cuchar`	Unicode functionality
`cwchar`	Support for wide characters
`cwctype`	Classifying wide characters

Table 85. New Standard C header files—DLIB

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C++ header files

The C++ library header files

Using Standard C libraries in C++

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