std::coroutine_handle<Promise>::promise

 

C++

Compiler support

Freestanding and hosted

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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

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Ranges library (C++20)

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Numerics library

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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)

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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>

 

Member of the primary template
Promise& promise() const;		(since C++20)
Member of specialization std::coroutine_handle<std::noop_coroutine_promise>
std::noop_coroutine_promise& promise() const noexcept;		(since C++20)

Obtains a reference to the promise object.

The behavior is undefined if *this does not refer to a coroutine whose promise object has not been destroyed.

This function is not provided for the specialization std::coroutine_handle<>.

Parameters

(none)

Return value

A reference to the promise object.

Notes

The promise object of a no-op coroutine is not destroyed as long as there is some std::noop_coroutine_handle referring to the coroutine.

See also

from_promise [static]

creates a coroutine_handle from the promise object of a coroutine (public static member function)

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