Utility library

 

C++

Language

Standard library headers

Concepts

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Technical Specifications

 

Utilities library

Type support (basic types, RTTI, type traits)

Dynamic memory management

Error handling

Program utilities

Variadic functions

Date and time

Function objects

initializer_list (C++11)

bitset

hash (C++11)

Relational operators

rel_ops::operator!=rel_ops::operator>rel_ops::operator<=rel_ops::operator>=

Pairs and tuples

pair

tuple (C++11)

piecewise_construct_t (C++11)

piecewise_construct (C++11)

integer_sequence (C++14)

Swap, forward and move

swap

exchange (C++14)

forward (C++11)

move (C++11)

move_if_noexcept (C++11)

declval (C++11)

 

C++ includes a variety of utility libraries that provide functionality ranging from bit-counting to partial function application. These libraries can be broadly divided into two groups:

• language support libraries, and
• general-purpose libraries.

Language support

Language support libraries provide classes and functions that interact closely with language features and support common language idioms.

Type support

Basic types (e.g. std::size_t, std::nullptr_t), RTTI (e.g. std::type_info), type traits (e.g. std::is_integral, std::rank)

Dynamic memory management

Smart pointers (e.g. std::shared_ptr), allocators (e.g. std::allocator), C-style memory management (e.g. std::malloc)

Error handling

Exceptions (e.g. std::exception, std::logic_error), assertions (e.g. assert)

Initializer lists

initializer_list (C++11)

allows the use of initializer list syntax to initialize non-aggregate types (class template)

Variadic functions

Support for functions that take an arbitrary number of parameters (via e.g. va_start, va_arg, va_end)

General-purpose utilities

Program utilities

Termination (e.g. std::abort, std::atexit), environment (e.g. std::system), signals (e.g. std::raise)

Date and time

Time tracking (e.g. std::chrono::time_point, std::chrono::duration), C-style date and time (e.g. std::time, std::clock)

Bitset

bitset

implements constant length bit array (class)

Function objects

Partial function application (e.g. std::bind) and related utilities: utilities for binding such as std::ref and std::placeholders, polymorphic function wrappers: std::function, predefined functors (e.g. std::plus, std::equal_to), method to function converters std::mem_fn.

Pairs and tuples

pair	implements binary tuple, i.e. a pair of values (class template)
tuple (C++11)	implements fixed size container, which holds elements of possibly different types (class template)
piecewise_construct_t (C++11)	tag type used to select correct function overload for piecewise construction (class)
piecewise_construct (C++11)	an object of type piecewise_construct_t used to disambiguate functions for piecewise construction (constant)
integer_sequence (C++14)	implements compile-time sequence of integers (class template)

Swap, forward and move

swap	swaps the values of two objects (function template)
exchange (C++14)	replaces the argument with a new value and returns its previous value (function template)
forward (C++11)	forwards a function argument (function template)
move (C++11)	obtains an rvalue reference (function template)
move_if_noexcept (C++11)	obtains an rvalue reference if the move constructor does not throw (function template)
declval (C++11)	obtains the type of expression in unevaluated context (function template)

Relational operators

Defined in namespace std::rel_ops
operator!=operator>operator<=operator>=	automatically generates comparison operators based on user-defined operator== and operator< (function template)

Hash support

hash (C++11)

hash function object (class template)