[/
 / Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 /
 / Distributed under the Boost Software License, Version 1.0. (See accompanying
 / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 /]

[section:library_elements Supporting Library Elements]

The Asio asynchronous model is enabled by the library elements listed in the
table below.

[table
  [
    [Library Element]
    [Description]
  ]
  [
    [
      `completion_signature` concept
    ]
    [
      Defines valid completion signature forms.
    ]
  ]
  [
    [
      `completion_handler_for` concept
    ]
    [
      Determines whether a completion handler is callable with a given set of
      completion signatures.
    ]
  ]
  [
    [
      [link asio.reference.async_result async_result] trait
    ]
    [
      Converts a completion signature and completion token into a concrete
      completion handler, and launches the operation.
    ]
  ]
  [
    [
      [link asio.reference.async_initiate async_initiate] function
    ]
    [
      Helper function to simplify use of the `async_result` trait.
    ]
  ]
  [
    [
      `completion_token_for` concept
    ]
    [
      Determines whether a completion token produces a completion handler for a
      given set of completion signatures.
    ]
  ]
  [
    [
      [link asio.reference.associator associator] trait
    ]
    [
      Automatically propagates all associators through layers of abstraction.
    ]
  ]
  [
    [
      [link asio.reference.associated_executor associated_executor] trait,
      `associated_executor_t` type alias, and [link
      asio.reference.get_associated_executor get_associated_executor] function
    ]
    [
      Defines an asynchronous agent’s associated executor.
    ]
  ]
  [
    [
      [link asio.reference.associated_allocator associated_allocator] trait,
      `associated_allocator_t` type alias, and [link
      asio.reference.get_associated_allocator get_associated_allocator] function
    ]
    [
      Defines an asynchronous agent’s associated allocator.
    ]
  ]
  [
    [
      [link asio.reference.associated_cancellation_slot
      associated_cancellation_slot] trait, `associated_cancellation_slot_t`
      type alias, and [link asio.reference.get_associated_cancellation_slot
      get_associated_cancellation_slot] function
    ]
    [
      Defines an asynchronous agent’s associated cancellation slot.
    ]
  ]
]

[endsect]
