dpp::detail::when_any Namespace Reference

Internal cogwheels for dpp::when_any. More...

Classes
struct	arg_helper_s
	Type trait helper to obtain the actual type that will be used by a when_any when a type is passed as a parameter. May specialize for certain types for specific behavior, e.g. for an event_router, store the awaitable directly. More...
struct	arg_helper_s< dpp::event_router_t< T > >
struct	empty
	Empty result from void-returning awaitable. More...

Typedefs
template<typename T >
using	awaitable_type = typename arg_helper_s< T >::type
	Alias for the actual type that an awaitable will be stored as in a when_any. For example if given an event_router, store the awaitable, not the event_router. More...
template<typename T >
using	arg_helper = arg_helper_s< std::remove_cvref_t< T > >
	Helper struct with a method to convert an awaitable parameter to the actual value it will be stored as. For example if given an event_router, store the awaitable, not the event_router. More...
template<typename T >
using	storage_type = std::conditional_t< std::is_void_v< T >, empty, T >
	Actual type a result will be stores as in when_any. More...

Enumerations
enum	await_state { await_state::started, await_state::waiting, await_state::done, await_state::dangling }
	Current state of a when_any object. More...

Variables
template<typename T >
concept	void_result = std::same_as<T, empty>
	Concept satisfied if a stored result is void. More...

Detailed Description

Internal cogwheels for dpp::when_any.

Typedef Documentation

arg_helper

template<typename T >

using dpp::detail::when_any::arg_helper = typedef arg_helper_s<std::remove_cvref_t<T> >

Helper struct with a method to convert an awaitable parameter to the actual value it will be stored as. For example if given an event_router, store the awaitable, not the event_router.

awaitable_type

template<typename T >

using dpp::detail::when_any::awaitable_type = typedef typename arg_helper_s<T>::type

Alias for the actual type that an awaitable will be stored as in a when_any. For example if given an event_router, store the awaitable, not the event_router.

storage_type

template<typename T >

using dpp::detail::when_any::storage_type = typedef std::conditional_t<std::is_void_v<T>, empty, T>

Actual type a result will be stores as in when_any.

Enumeration Type Documentation

await_state

enum dpp::detail::when_any::await_state

strong

Current state of a when_any object.

Enumerator
started	Object was started but not awaited.
waiting	Object is being awaited.
done	Object was resumed.
dangling	Object was destroyed.

Variable Documentation

void_result

template<typename T >

concept dpp::detail::when_any::void_result = std::same_as<T, empty>

Concept satisfied if a stored result is void.