Namespaces
Variants
Views
Actions

std::noop_coroutine_promise

From cppreference.com
< cpp‎ | coroutine
 
 
Utilities library
Language support
Type support (basic types, RTTI)
Library feature-test macros (C++20)
Dynamic memory management
Program utilities
Coroutine support (C++20)
Variadic functions
Debugging support
(C++26)
Three-way comparison
(C++20)
(C++20)(C++20)(C++20)
(C++20)(C++20)(C++20)
General utilities
Date and time
Function objects
Formatting library (C++20)
(C++11)
Relational operators (deprecated in C++20)
Integer comparison functions
(C++20)(C++20)(C++20)   
(C++20)
Swap and type operations
(C++14)
(C++11)
(C++11)
(C++11)
(C++17)
Common vocabulary types
(C++11)
(C++17)
(C++17)
(C++17)
(C++11)
(C++17)
(C++23)
Elementary string conversions
(C++17)
(C++17)

 
Coroutine support
Coroutine traits
Coroutine handle
No-op coroutines
noop_coroutine_promise
(C++20)
Trivial awaitables
Range generators
(C++23)
 
Defined in header <coroutine>
struct noop_coroutine_promise {};
(since C++20)

noop_coroutine_promise is the promise type of no-op coroutines.

A no-op coroutine behaves as if it

  • does nothing other than the control flow of a coroutine, and
  • is suspended immediately after beginning and resumption, and
  • has a coroutine state such that destroying the state is no-op, and
  • never reaches its final suspended point if there is any std::coroutine_handle referring to it.

No-op coroutines can be started by std::noop_coroutine, and controlled by the coroutine handle it returns. The returned coroutine handle is of type std::noop_coroutine_handle, which is a synonym for std::coroutine_handle<std::noop_coroutine_promise>.

Some operations of a no-op coroutines are determined no-op at compile time through the type std::noop_coroutine_handle.

[edit] Example

[edit] See also

creates a coroutine handle that has no observable effects when resumed or destroyed
(function) [edit]
std::coroutine_handle<std::noop_coroutine_promise>, intended to refer to a no-op coroutine
(typedef) [edit]