std::coroutine_handle<Promise>::coroutine_handle

 

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)

Diagnostics library

Memory management library

Metaprogramming library (C++11)

General utilities library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library (C++17)

Concurrency support library (C++11)

Execution control library (C++26)

Technical specifications

Symbols index

External libraries

 

Utilities library

Language support Type support (basic types, RTTI) Library feature-test macros (C++20) Program utilities Variadic functions initializer_list (C++11) is_constant_evaluated (C++20) is_within_lifetime (C++26) source_location (C++20) Coroutine support (C++20) Contract support (C++26) Three-way comparison three_way_comparablethree_way_comparable_with (C++20)(C++20) strong_ordering (C++20) weak_ordering (C++20) partial_ordering (C++20) common_comparison_category (C++20) compare_three_way_result (C++20) compare_three_way (C++20) strong_order (C++20) weak_order (C++20) partial_order (C++20) compare_strong_order_fallback (C++20) compare_weak_order_fallback (C++20) compare_partial_order_fallback (C++20)   is_eqis_ltis_lteq (C++20)(C++20)(C++20)   is_neqis_gtis_gteq (C++20)(C++20)(C++20)

General utilities Function objects Bit manipulation (C++20) C-style bit manipulation (C++26) bitset hash (C++11) Relational operators (deprecated in C++20) rel_ops::operator!=rel_ops::operator>    rel_ops::operator<=rel_ops::operator>= Integer comparison functions cmp_equalcmp_lesscmp_less_than (C++20)(C++20)(C++20)   cmp_not_equalcmp_greatercmp_greater_than (C++20)(C++20)(C++20) in_range (C++20) Swap and type operations swap ranges::swap (C++20) exchange (C++14) declval (C++11) to_underlying (C++23) forward (C++11) forward_like (C++23) move (C++11) move_if_noexcept (C++11) as_const (C++17) Common vocabulary types pair tuple (C++11) optional (C++17) any (C++17) variant (C++17) tuple_size (C++11) tuple_element (C++11) apply (C++17) make_from_tuple (C++17) expected (C++23)

 

Coroutine support

Coroutine traits

coroutine_traits (C++20)

Coroutine handle

coroutine_handle (C++20)

No-op coroutines

noop_coroutine_promise (C++20)

noop_coroutine (C++20)

Trivial awaitables

suspend_never (C++20)

suspend_always (C++20)

Range generators

generator (C++23)

 

std::coroutine_handle

Member functions

coroutine_handle::coroutine_handle

coroutine_handle::operator=

coroutine_handle::from_promise

Conversion

coroutine_handle::operator coroutine_handle<>

Observers

coroutine_handle::done

coroutine_handle::operator bool

Control

coroutine_handle::operator()coroutine_handle::resume

coroutine_handle::destroy

Promise access

coroutine_handle::promise

Export/import

coroutine_handle::address

coroutine_handle::from_address

Non-member functions

operator==operator<=>

Helper classes

hash<std::coroutine_handle>

 

constexpr coroutine_handle() noexcept;	(1)	(since C++20)
constexpr coroutine_handle( std::nullptr_t ) noexcept;	(2)	(since C++20)
coroutine_handle( const coroutine_handle& other ) = default;	(3)	(since C++20)
coroutine_handle( coroutine_handle&& other ) = default;	(4)	(since C++20)

Creates a coroutine_handle that does not refer a coroutine, or copies a coroutine_handle.

1,2) Initializes the underlying address ptr to nullptr. After construction, address() returns nullptr, and the coroutine_handle does not refer a coroutine. These constructors are not declared for the specialization std::coroutine_handle<std::noop_coroutine_promise>.

3,4) Copies the underlying address. The copy constructor and move constructor are equivalent to implicitly declared ones.

Parameters

other

-

another coroutine_handle to copy

Notes

std::coroutine_handle<std::noop_coroutine_promise> is neither default constructible nor constructible from std::nullptr_t. std::noop_coroutine can be used to create a new std::coroutine_handle<std::noop_coroutine_promise>.

Static member functions from_promise and from_address can also create a coroutine_handle.

See also

from_promise [static]	creates a coroutine_handle from the promise object of a coroutine (public static member function)
from_address [static]	imports a coroutine from a pointer (public static member function)
noop_coroutine (C++20)	creates a coroutine handle that has no observable effects when resumed or destroyed (function)

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