associated_cancellation

associated_cancellation_slot

Traits type used to obtain the cancellation_slot associated with an object.

template<
    typename T,
    typename CancellationSlot = cancellation_slot>
struct associated_cancellation_slot

Types

Name	Description
type	If T has a nested type cancellation_slot_type, T::cancellation_slot_type. Otherwise CancellationSlot.

Member Functions

Name	Description
get [static]	If T has a nested type cancellation_slot_type, returns t.get_cancellation_slot(). Otherwise returns type(). — If T has a nested type cancellation_slot_type, returns t.get_cancellation_slot(). Otherwise returns s.

A program may specialise this traits type if the T template parameter in the specialisation is a user-defined type. The template parameter CancellationSlot shall be a type meeting the CancellationSlot requirements.

Specialisations shall meet the following requirements, where t is a const reference to an object of type T, and s is an object of type CancellationSlot.

Provide a nested typedef type that identifies a type meeting the CancellationSlot requirements.
Provide a noexcept static member function named get, callable as get(t) and with return type type or a (possibly const) reference to type.
Provide a noexcept static member function named get, callable as get(t,s) and with return type type or a (possibly const) reference to type.

Requirements

Header: boost/asio/associated_cancellation_slot.hpp

Convenience header: boost/asio.hpp