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 provide classes and functions that interact closely with language features and support common language idioms.
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).
Smart pointers (e.g. std::shared_ptr), allocators (e.g. std::allocator or std::memory_resource), C-style memory management (e.g. std::malloc).
Exceptions (e.g. std::exception, std::terminate), assertions (e.g. assert).
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(C++11) | allows the use of initializer list syntax to initialize non-aggregate types (class template) |
Support for functions that take an arbitrary number of parameters (via e.g. va_start, va_arg, va_end).
Implementation propertiesThe header | (since C++20) |
Termination (e.g. std::abort, std::atexit), environment (e.g. std::system), signals (e.g. std::raise).
Time tracking (e.g. std::chrono::time_point, std::chrono::duration), C-style date and time (e.g. std::time, std::clock).
| implements constant length bit array (class) |
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.
Defined in header <optional> |
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(C++17) | a wrapper that may or may not hold an object (class template) |
Defined in header <variant> |
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(C++17) | a type-safe discriminated union (class template) |
Defined in header <any> |
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(C++17) | Objects that hold instances of any CopyConstructible type. (class) |
Defined in header <utility> |
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(C++17) | in-place construction tag (class template) |
| implements binary tuple, i.e. a pair of values (class template) |
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(C++11) | implements fixed size container, which holds elements of possibly different types (class template) |
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(C++17) | calls a function with a tuple of arguments (function template) |
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(C++17) | Construct an object with a tuple of arguments (function template) |
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(C++11) | tag type used to select correct function overload for piecewise construction (class) |
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(C++11) | an object of type piecewise_construct_t used to disambiguate functions for piecewise construction (constant) |
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(C++14) | implements compile-time sequence of integers (class template) |
Defined in header <utility> |
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| swaps the values of two objects (function template) |
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(C++14) | replaces the argument with a new value and returns its previous value (function template) |
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(C++11) | forwards a function argument (function template) |
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(C++11) | obtains an rvalue reference (function template) |
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(C++11) | obtains an rvalue reference if the move constructor does not throw (function template) |
Defined in header <concepts> |
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(C++20) | swaps the values of two objects (customization point object) |
Defined in header <utility> |
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(C++11) | obtains a reference to its argument for use in unevaluated context (function template) |
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(C++17) | obtains a reference to const to its argument (function template) |
Defined in header <new> |
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(C++17) | pointer optimization barrier (function template) |
Defined in header <compare> |
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(C++20) | the result type of 3-way comparison that supports only equality/inequality and is not substitutable (class) |
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(C++20) | the result type of 3-way comparison that supports only equality/inequality and is substitutable (class) |
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(C++20) | the result type of 3-way comparison that supports all 6 operators, is not substitutable, and allows incomparable values (class) |
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(C++20) | the result type of 3-way comparison that supports all 6 operators and is not substitutable (class) |
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(C++20) | the result type of 3-way comparison that supports all 6 operators and is substitutable (class) |
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(C++20) | named comparison functions (function) |
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(C++20) | the strongest comparison category to which all of the given types can be converted (class template) |
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(C++20) | performs 3-way comparison and produces a result of type std::strong_ordering (function template) |
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(C++20) | performs 3-way comparison and produces a result of type std::weak_ordering (function template) |
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(C++20) | performs 3-way comparison and produces a result of type std::partial_ordering (function template) |
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(C++20) | performs 3-way comparison and produces a result of type std::strong_equality (function template) |
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(C++20) | performs 3-way comparison and produces a result of type std::weak_equality (function template) |
Defined in header <utility> |
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Defined in namespace std::rel_ops |
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(deprecated in C++20) | automatically generates comparison operators based on user-defined operator== and operator< (function template) |
In addition to sophisticated locale-dependent parsers and formatters provided by the C++ I/O library, the C I/O library, C++ string converters, and C string converters, the header <charconv> provides light-weight, locale-independent, non-allocating, non-throwing, ASCII-only parsers and formatters for arithmetic types.
Defined in header <charconv> |
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(C++17) | converts an integer or floating-point value to a character sequence (function) |
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(C++17) | converts a character sequence to an integer or floating-point value (function) |
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(C++17) | specifies formatting for std::to_chars and std::from_chars (enum) |
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(C++11) | hash function object (class template) |
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