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...

#include <task.h>

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

Collaboration diagram for dpp::detail::task::promise_base:

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_t >	state = 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_exception

On 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.