std::experimental::propagate_const<T>::swap

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Execution support library (C++26)

Technical specifications

Symbols index

External libraries

 

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

 

Library fundamentals v2

experimental::propagate_const

experimental::not_fn

experimental::observer_ptr

experimental::make_array

experimental::to_array

experimental::ostream_joiner

experimental::gcd

experimental::lcm

experimental::source_location

experimental::randint

detection idiom

uniform container erasure

logical operator type traits

 

std::experimental::propagate_const

Member functions

propagate_const::propagate_const

propagate_const::operator=

propagate_const::swap

Observers

propagate_const::get

propagate_const::operator bool

propagate_const::operator*propagate_const::operator->

propagate_const::operator element_type*propagate_const::operator const element_type*

Non-member functions

operator==operator!=operator<operator>operator<=operator>operator>=

swap

get_underlying

Helper classes

std::hash

std::equal_tostd::not_equal_tostd::lessstd::greaterstd::less_equalstd::greater_equal

 

constexpr void swap( propagate_const & pt ) noexcept(/* see below */);		(library fundamentals TS v2)

Swaps the wrapped pointer with that of pt. Let t_ designate the private data member that is the wrapped pointer-like object, then this function is equivalent to swap(t_, pt.t_), where the overload resolution for swap is performed among std::swap and any declaration found by the usual lookup rules, as described in Swappable.

The behavior is undefined if lvalues of T do not satisfy Swappable.

Parameters

pt

-

another propagate_const object to swap with

Exceptions

noexcept specification:   noexcept(noexcept(swap(t_, pt.t_))) The lookup for the identifier swap in the exception specification finds overloads described above, and does not find the member function itself, making the exception specification equivalent to C++17 std::is_nothrow_swappable.	(library fundamentals TS v2)
noexcept specification:   noexcept(std::is_nothrow_swappable_v<T>)	(library fundamentals TS v3)

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
LWG 3413	LFTSv2	the exception specification was ill-formed	made well-formed