D++ (DPP)
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dpp::detail::task::promise_base Struct Reference

Base implementation of task::promise_t, without the logic that would depend on the return type. Meant to be inherited from. More...

+ Inheritance diagram for dpp::detail::task::promise_base:
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Classes

struct  proxy_awaiter
 Proxy awaitable that wraps any co_await inside the task and checks for cancellation on resumption. More...
 

Public Member Functions

std_coroutine::suspend_never initial_suspend () const noexcept
 Function called by the standard library when the coroutine is created. More...
 
void unhandled_exception ()
 Function called by the standard library when an exception is thrown and not caught in the coroutine. More...
 
template<typename T >
auto await_transform (T &&expr) const noexcept(noexcept(co_await_resolve(std::forward< T >(expr))))
 Function called whenever co_await is used inside of the task. More...
 

Public Attributes

std::atomic< state_tstate = state_t::started
 State of the task, used to keep track of lifetime and status. More...
 
std::atomic< bool > cancelled = false
 Whether the task is cancelled or not. More...
 
detail::std_coroutine::coroutine_handle parent = nullptr
 Parent coroutine to return to for nested coroutines. More...
 

Detailed Description

Base implementation of task::promise_t, without the logic that would depend on the return type. Meant to be inherited from.

Member Function Documentation

◆ await_transform()

template<typename T >
auto dpp::detail::task::promise_base::await_transform ( T &&  expr) const
inlinenoexcept

Function called whenever co_await is used inside of the task.

Exceptions
dpp::task_cancelled_exceptionOn resumption if the task was cancelled
Returns
proxy_awaiter Returns a proxy awaiter that will check for cancellation on resumption

◆ initial_suspend()

std_coroutine::suspend_never dpp::detail::task::promise_base::initial_suspend ( ) const
inlinenoexcept

Function called by the standard library when the coroutine is created.

Returns
std::suspend_never Don't suspend, the coroutine starts immediately.

◆ unhandled_exception()

void dpp::detail::task::promise_base::unhandled_exception ( )
inline

Function called by the standard library when an exception is thrown and not caught in the coroutine.

Stores the exception pointer to rethrow on co_await. If the task object is destroyed and was not cancelled, throw instead

Member Data Documentation

◆ cancelled

std::atomic<bool> dpp::detail::task::promise_base::cancelled = false

Whether the task is cancelled or not.

◆ parent

detail::std_coroutine::coroutine_handle dpp::detail::task::promise_base::parent = nullptr

Parent coroutine to return to for nested coroutines.

◆ state

std::atomic<state_t> dpp::detail::task::promise_base::state = state_t::started

State of the task, used to keep track of lifetime and status.

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