Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for an old version of Boost. Click here to view this page for the latest version.
PrevUpHomeNext

deferred_t

Class used to specify that an asynchronous operation should return a function object to lazily launch the operation.

class deferred_t
Types

Name

Description

as_default_on_t

Type alias to adapt an I/O object to use deferred_t as its default completion token type.

executor_with_default

Adapts an executor to add the deferred_t completion token as the default.

Member Functions

Name

Description

as_default_on [static]

Function helper to adapt an I/O object to use deferred_t as its default completion token type.

deferred_t [constructor]

Default constructor.

operator()

Creates a new deferred from a function.

Passes through anything that is already deferred.

values [static]

Returns a deferred operation that returns the provided values.

when [static]

Creates a conditional object for branching deferred operations.

The deferred_t class is used to indicate that an asynchronous operation should return a function object which is itself an initiation function. A deferred_t object may be passed as a completion token to an asynchronous operation, typically using the special value boost::asio::deferred. For example:

auto my_deferred_op
 = my_socket.async_read_some(my_buffer,
     boost::asio::deferred);

The initiating function (async_read_some in the above example) returns a function object that will lazily initiate the operation.

Requirements

Header: boost/asio/deferred.hpp

Convenience header: boost/asio.hpp


PrevUpHomeNext