Properties Execution Customisation Points prefer query require require_concept Traits can_prefer can_query can_require can_require_concept is_nothrow_prefer is_nothrow_query is_nothrow_require is_nothrow_require_concept prefer_result query_result require_result require_concept_result Class Templates execution::any_executor Classes execution::bad_executor execution::invocable_archetype execution::receiver_invocation_error Properties execution::allocator_t execution::blocking_t execution::blocking_t::possibly_t execution::blocking_t::always_t execution::blocking_t::never_t execution::blocking_adaptation_t execution::blocking_adaptation_t::disallowed_t execution::blocking_adaptation_t::allowed_t execution::bulk_guarantee_t execution::bulk_guarantee_t::unsequenced_t execution::bulk_guarantee_t::sequenced_t execution::bulk_guarantee_t::parallel_t execution::context_t execution::context_as_t execution::mapping_t execution::mapping_t::thread_t execution::mapping_t::new_thread_t execution::mapping_t::other_t execution::occupancy_t execution::outstanding_work_t execution::outstanding_work_t::untracked_t execution::outstanding_work_t::tracked_t execution::prefer_only execution::relationship_t execution::relationship_t::fork_t execution::relationship_t::continuation_t Customisation Points execution::bulk_execute execution::connect execution::execute execution::schedule execution::set_done execution::set_error execution::set_value execution::start execution::submit Property Objects execution::allocator execution::blocking execution::blocking.possibly execution::blocking.always execution::blocking.never execution::blocking_adaptation execution::blocking_adaptation.disallowed execution::blocking_adaptation.allowed execution::bulk_guarantee execution::bulk_guarantee.unsequenced execution::bulk_guarantee.sequenced execution::bulk_guarantee.parallel execution::context execution::context_as execution::mapping execution::mapping.thread execution::mapping.new_thread execution::mapping.other execution::occupancy execution::outstanding_work execution::outstanding_work.untracked execution::outstanding_work.tracked execution::relationship execution::relationship.fork execution::relationship.continuation Type Traits execution::can_bulk_execute execution::can_connect execution::can_execute execution::can_schedule execution::can_set_done execution::can_set_error execution::can_set_value execution::can_start execution::can_submit execution::connect_result execution::is_executor execution::is_executor_of execution::is_nothrow_receiver_of execution::is_receiver execution::is_receiver_of execution::is_sender execution::is_sender_to execution::is_typed_sender execution::sender_traits Concepts executor executor_of operation_state receiver receiver_of scheduler sender sender_to typed_sender Core Classes any_io_executor bad_executor cancellation_signal cancellation_slot cancellation_state cancellation_type coroutine detached_t execution_context execution_context::id execution_context::service executor executor_arg_t invalid_service_owner io_context io_context::executor_type io_context::service io_context::strand io_context::work (deprecated) multiple_exceptions service_already_exists static_thread_pool system_context system_executor this_coro::executor_t thread_pool thread_pool::executor_type yield_context Free Functions add_service experimental::append experimental::as_single experimental::as_tuple experimental::make_parallel_group experimental::prepend asio_handler_allocate (deprecated) asio_handler_deallocate (deprecated) asio_handler_invoke (deprecated) asio_handler_is_continuation async_compose async_initiate bind_allocator bind_cancellation_slot bind_executor co_spawn dispatch defer get_associated_allocator get_associated_cancellation_slot get_associated_executor has_service make_strand make_work_guard post redirect_error spawn this_coro::reset_cancellation_state this_coro::throw_if_cancelled use_service Class Templates async_completion awaitable basic_io_object basic_system_executor basic_yield_context cancellation_filter cancellation_slot_binder experimental::deferred_t executor_binder executor_work_guard experimental::append_t experimental::as_single_t experimental::as_tuple_t experimental::basic_channel experimental::basic_concurrent_channel experimental::channel_traits experimental::coro experimental::parallel_group experimental::prepend_t experimental::promise experimental::use_coro_t experimental::wait_for_all experimental::wait_for_one experimental::wait_for_one_error experimental::wait_for_one_success io_context::basic_executor_type recycling_allocator redirect_error_t strand thread_pool::basic_executor_type use_awaitable_t use_future_t Special Values detached executor_arg experimental::deferred experimental::use_coro this_coro::cancellation_state this_coro::executor use_future use_awaitable Error Codes error::basic_errors error::netdb_errors error::addrinfo_errors error::misc_errors Boost.Bind Placeholders placeholders::bytes_transferred placeholders::endpoint placeholders::error placeholders::iterator placeholders::results placeholders::signal_number Type Traits associated_allocator associated_cancellation_slot associated_executor associator async_result default_completion_token is_executor uses_executor Type Requirements Asynchronous operations CancellationHandler CancellationSlot ExecutionContext Executor Handler NullaryToken Service Buffers and Buffer-Oriented Operations Classes const_buffer mutable_buffer const_buffers_1 (deprecated) mutable_buffers_1 (deprecated) const_registered_buffer mutable_registered_buffer null_buffers (deprecated) streambuf registered_buffer_id Class Templates basic_streambuf buffer_registration buffered_read_stream buffered_stream buffered_write_stream buffers_iterator dynamic_string_buffer dynamic_vector_buffer Free Functions async_read async_read_at async_read_until async_write async_write_at buffer buffer_cast (deprecated) buffer_copy buffer_size buffer_sequence_begin buffer_sequence_end buffers_begin buffers_end dynamic_buffer read read_at read_until register_buffers transfer_all transfer_at_least transfer_exactly write write_at Type Traits is_const_buffer_sequence is_dynamic_buffer is_dynamic_buffer_v1 is_dynamic_buffer_v2 is_match_condition is_mutable_buffer_sequence is_read_buffered is_write_buffered Type Requirements Read and write operations AsyncRandomAccessReadDevice AsyncRandomAccessWriteDevice AsyncReadStream AsyncWriteStream CompletionCondition ConstBufferSequence DynamicBuffer DynamicBuffer_v1 DynamicBuffer_v2 MutableBufferSequence ReadHandler ReadToken SyncRandomAccessReadDevice SyncRandomAccessWriteDevice SyncReadStream SyncWriteStream WriteHandler WriteToken Networking Classes generic::datagram_protocol generic::datagram_protocol::endpoint generic::datagram_protocol::socket generic::raw_protocol generic::raw_protocol::endpoint generic::raw_protocol::socket generic::seq_packet_protocol generic::seq_packet_protocol::endpoint generic::seq_packet_protocol::socket generic::stream_protocol generic::stream_protocol::endpoint generic::stream_protocol::iostream generic::stream_protocol::socket ip::address ip::address_v4 ip::address_v4_iterator ip::address_v4_range ip::address_v6 ip::address_v6_iterator ip::address_v6_range ip::bad_address_cast ip::icmp ip::icmp::endpoint ip::icmp::resolver ip::icmp::socket ip::network_v4 ip::network_v6 ip::resolver_base ip::resolver_query_base ip::tcp ip::tcp::acceptor ip::tcp::endpoint ip::tcp::iostream ip::tcp::resolver ip::tcp::socket ip::udp ip::udp::endpoint ip::udp::resolver ip::udp::socket ip::v4_mapped_t socket_base Free Functions async_connect connect ip::host_name ip::make_address ip::make_address_v4 ip::make_address_v6 ip::make_network_v4 ip::make_network_v6 Class Templates basic_datagram_socket basic_raw_socket basic_seq_packet_socket basic_socket basic_socket_acceptor basic_socket_iostream basic_socket_streambuf basic_stream_socket generic::basic_endpoint ip::basic_endpoint ip::basic_resolver ip::basic_resolver_entry ip::basic_resolver_iterator ip::basic_resolver_results ip::basic_resolver_query Socket Options ip::multicast::enable_loopback ip::multicast::hops ip::multicast::join_group ip::multicast::leave_group ip::multicast::outbound_interface ip::tcp::no_delay ip::unicast::hops ip::v6_only socket_base::broadcast socket_base::debug socket_base::do_not_route socket_base::enable_connection_aborted socket_base::keep_alive socket_base::linger socket_base::receive_buffer_size socket_base::receive_low_watermark socket_base::reuse_address socket_base::send_buffer_size socket_base::send_low_watermark I/O Control Commands socket_base::bytes_readable Type Requirements Synchronous socket operations Asynchronous socket operations AcceptableProtocol AcceptHandler AcceptToken ConnectCondition ConnectHandler ConnectToken Endpoint EndpointSequence GettableSocketOption InternetProtocol IoControlCommand IteratorConnectHandler IteratorConnectToken MoveAcceptHandler MoveAcceptToken Protocol RangeConnectHandler RangeConnectToken ResolveHandler ResolveToken SettableSocketOption Timers SSL Serial Ports Signal Handling Classes deadline_timer high_resolution_timer steady_timer system_timer Class Templates basic_deadline_timer basic_waitable_timer time_traits wait_traits Type Requirements TimeTraits WaitHandler WaitToken WaitTraits Classes ssl::context ssl::context_base ssl::host_name_verification ssl::rfc2818_verification (deprecated) ssl::stream_base ssl::verify_context Class Templates ssl::stream Error Codes ssl::error::stream_errors Type Requirements BufferedHandshakeHandler BufferedHandshakeToken HandshakeHandler HandshakeToken ShutdownHandler ShutdownToken Classes serial_port serial_port_base Class templates basic_serial_port Serial Port Options serial_port_base::baud_rate serial_port_base::flow_control serial_port_base::parity serial_port_base::stop_bits serial_port_base::character_size Type Requirements GettableSerialPortOption SettableSerialPortOption Classes signal_set Class Templates basic_signal_set Type Requirements SignalHandler SignalToken Files and Pipes POSIX-specific Windows-specific Class Templates basic_file basic_random_access_file basic_readable_pipe basic_stream_file basic_writable_pipe Classes file_base random_access_file readable_pipe stream_file writable_pipe Free Functions connect_pipe Classes local::stream_protocol local::stream_protocol::acceptor local::stream_protocol::endpoint local::stream_protocol::iostream local::stream_protocol::socket local::datagram_protocol local::datagram_protocol::endpoint local::datagram_protocol::socket posix::descriptor posix::descriptor_base posix::stream_descriptor Free Functions local::connect_pair Class Templates local::basic_endpoint posix::basic_descriptor posix::basic_stream_descriptor Classes windows::object_handle windows::overlapped_handle windows::overlapped_ptr windows::random_access_handle windows::stream_handle Class Templates windows::basic_object_handle windows::basic_overlapped_handle windows::basic_random_access_handle windows::basic_stream_handle