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C++ standard libraries extensions, version 2

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Experimental
Technical Specification
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals TS v2)
Library fundamentals 3 (library fundamentals TS v3)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Extensions for concurrency 2 (concurrency TS v2)
Concepts (concepts TS)
Ranges (ranges TS)
Reflection (reflection TS)
Mathematical special functions (special functions TR)
Experimental Non-TS
Pattern Matching
Linear Algebra
std::execution
Contracts
2D Graphics
 
 

Version 2 of the C++ Extensions for Library Fundamentals, ISO/IEC TS 19568:2017, defines the following new components for the C++ standard library, in addition to those defined in version 1:

Contents

[edit] The C++ detection idiom

Defined in header <experimental/type_traits>
alias templates that detect whether a template-id is well-formed
(alias template)
class type returned by detected_t on failure
(class)

[edit] A const-propagating wrapper for pointer-like objects

a const-propagating wrapper for pointer-like objects
(class template)

[edit] Non-owning pointers

Defined in header <experimental/memory>
a class representing a non-owning pointer
(class template)

[edit] std::array creation

Defined in header <experimental/array>
(library fundamentals TS v2)
creates a std::array object whose size and optionally element type are deduced from the arguments
(function template) [edit]

[edit] ostream_joiner

Defined in header <experimental/iterator>
an output iterator that writes successive elements into an output stream, separating adjacent elements with a delimiter
(class template)

[edit] Simple random number generation facilities

A per-thread engine of type std::default_random_engine , initialized to an unpredictable state, is maintained for each thread and used by the functions below.

Defined in header <experimental/random>
generates a random integer in the specified range
(function template) [edit]
reseeds the per-thread random engine
(function) [edit]
Defined in header <experimental/algorithm>
selects n random elements from a sequence
(function template)
randomly re-orders elements in a range
(function template)

[edit] Feature test macros

Defined in header <experimental/type_traits>
__cpp_lib_experimental_logical_traits
a value of at least 201511 indicates that the logical operator type traits are supported
(macro constant)
__cpp_lib_experimental_detect
a value of at least 201505 indicates that the detection idiom is supported
(macro constant)
__cpp_lib_experimental_propagate_const
a value of at least 201505 indicates that propagate_const is supported
(macro constant)
Defined in header <experimental/functional>
__cpp_lib_experimental_not_fn
a value of at least 201406 indicates that not_fn is supported
(macro constant)
Defined in header <experimental/memory>
__cpp_lib_experimental_observer_ptr
a value of at least 201411 indicates that observer_ptr is supported
(macro constant)
Defined in header <experimental/array>
__cpp_lib_experimental_make_array
a value of at least 201505 indicates that make_array is supported
(macro constant)
Defined in header <experimental/iterator>
__cpp_lib_experimental_ostream_joiner
a value of at least 201411 indicates that ostream_joiner is supported
(macro constant)
Defined in header <experimental/vector>
__cpp_lib_experimental_erase_if
a value of at least 201411 indicates that uniform container erasure is supported
(macro constant)
Defined in header <experimental/numeric>
__cpp_lib_experimental_gcd_lcm
a value of at least 201411 indicates that gcd and lcm are supported
(macro constant)
Defined in header <experimental/random>
__cpp_lib_experimental_randint
a value of at least 201511 indicates that randint and related functions are supported
(macro constant)
__cpp_lib_experimental_source_location
a value of at least 201505 indicates that source_location is supported
(macro constant)

[edit] Merged into C++17

The following components of the library fundamentals v2 have been adopted into the C++17 standard.

Defined in header <experimental/type_traits>
variadic alias template for void
(alias template)
Defined in header <experimental/type_traits>
variadic logical AND metafunction
(class template)
variadic logical OR metafunction
(class template)
logical NOT metafunction
(class template)
Defined in header <experimental/functional>
creates a function object that returns the complement of the result of the function object it holds
(function template) [edit]
Defined in header <experimental/numeric>
constexpr function template returning the greatest common divisor of two integers
(function template) [edit]
constexpr function template returning the least common multiple of two integers
(function template) [edit]

[edit] Merged into C++20

The following components of the library fundamentals v2 have been adopted into the C++20 standard.

[edit] Uniform container erasure

Defined in header <experimental/string>
erases all elements equal to a specific value from a std::basic_string
(function template)
erases all elements satisfying a predicate from a std::basic_string
(function template)
Defined in header <experimental/deque>
erases all elements equal to a specific value from a std::deque
(function template)
erases all elements satisfying a predicate from a std::deque
(function template)
Defined in header <experimental/vector>
erases all elements equal to a specific value from a std::vector
(function template)
erases all elements satisfying a predicate from a std::vector
(function template)
Defined in header <experimental/forward_list>
erases all elements equal to a specific value from a std::forward_list
(function template)
erases all elements satisfying a predicate from a std::forward_list
(function template)
Defined in header <experimental/list>
erases all elements equal to a specific value from a std::list
(function template)
erases all elements satisfying a predicate from a std::list
(function template)
Defined in header <experimental/map>
erases all elements satisfying a predicate from a std::map
(function template)
erases all elements satisfying a predicate from a std::multimap
(function template)
Defined in header <experimental/set>
erases all elements satisfying a predicate from a std::set
(function template)
erases all elements satisfying a predicate from a std::multiset
(function template)
Defined in header <experimental/unordered_map>
erases all elements satisfying a predicate from a std::unordered_map
(function template)
erases all elements satisfying a predicate from a std::unordered_multimap
(function template)
Defined in header <experimental/unordered_set>
erases all elements satisfying a predicate from a std::unordered_set
(function template)
erases all elements satisfying a predicate from a std::unordered_multiset
(function template)

[edit] Source code information capture

a class representing information about the source code, such as file names, line numbers, and function names
(class)

[edit] std::array conversion

Defined in header <experimental/array>
creates a std::array object from a built-in array
(function template) [edit]
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