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To use Beast effectively, a prior understanding of Networking is required. This section reviews these concepts as a reminder and guide for further learning.
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Refresher
Refresher
To use Beast effectively, a prior understanding of Networking is required. This section reviews these concepts as a reminder and guide for further learning.
To use Beast effectively, a prior understanding of Networking is required. This section reviews these concepts as a reminder and guide for further learning.
A [@https://en.wikipedia.org/wiki/Computer_network ['network]] allows programs located anywhere to exchange information after opting-in to communications by establishing a [@https://en.wikipedia.org/wiki/Data_link ['connection]]. Data may be reliably transferred across a connection in both directions ([@https://en.wikipedia.org/wiki/Duplex_(telecommunications) ['full-duplex]]) with bytes arriving in the same order they were sent. These connections, along with the objects and types used to represent them, are collectively termed [link beast.concepts.streams ['streams]]. The computer or device attached to the network is called a [@https://en.wikipedia.org/wiki/Host_(network) ['host]], and the program on the other end of an established connection is called a [@https://en.wikipedia.org/wiki/Peer-to-peer ['peer]].
A [@https://en.wikipedia.org/wiki/Computer_network ['network]] allows programs located anywhere to exchange information after opting-in to communications by establishing a [@https://en.wikipedia.org/wiki/Data_link ['connection]]. Data may be reliably transferred across a connection in both directions ([@https://en.wikipedia.org/wiki/Duplex_(telecommunications) ['full-duplex]]) with bytes arriving in the same order they were sent. These connections, along with the objects and types used to represent them, are collectively termed [link beast.concepts.streams ['streams]]. The computer or device attached to the network is called a [@https://en.wikipedia.org/wiki/Host_(network) ['host]], and the program on the other end of an established connection is called a [@https://en.wikipedia.org/wiki/Peer-to-peer ['peer]].
The [@https://en.wikipedia.org/wiki/Internet ['internet]] is a global network of interconnected computers that use a variety of standardized communication protocols to exchange information. The most popular protocol is [@https://en.wikipedia.org/wiki/Transmission_Control_Protocol ['TCP/IP]], which this library relies on exclusively. The protocol takes care of the low level details so that applications see a ['stream], which is the reliable, full-duplex connection carrying the ordered set of bytes described above. A [@https://en.wikipedia.org/wiki/Server_(computing) ['server]] is a powerful, always-on host at a well-known network name or network address which provides data services. A [@https://en.wikipedia.org/wiki/Client_(computing) ['client]] is a transient peer which connects to a server to exchange data, and goes offline.
The [@https://en.wikipedia.org/wiki/Internet ['internet]] is a global network of interconnected computers that use a variety of standardized communication protocols to exchange information. The most popular protocol is [@https://en.wikipedia.org/wiki/Transmission_Control_Protocol ['TCP/IP]], which this library relies on exclusively. The protocol takes care of the low level details so that applications see a ['stream], which is the reliable, full-duplex connection carrying the ordered set of bytes described above. A [@https://en.wikipedia.org/wiki/Server_(computing) ['server]] is a powerful, always-on host at a well-known network name or network address which provides data services. A [@https://en.wikipedia.org/wiki/Client_(computing) ['client]] is a transient peer which connects to a server to exchange data, and goes offline.
A vendor supplies a program called a [@https://en.wikipedia.org/wiki/Device_driver ['device driver]], enabling networking hardware such as an [@https://en.wikipedia.org/wiki/Network_interface_controller ['ethernet adaptor]] to talk to the operating system. This in turn permits running programs to interact with networking using various flavors of interfaces such as [@https://en.wikipedia.org/wiki/Berkeley_sockets ['Berkeley sockets]] or [@https://en.wikipedia.org/wiki/Winsock ['Windows Sockets 2]] ("Winsock").
A vendor supplies a program called a [@https://en.wikipedia.org/wiki/Device_driver ['device driver]], enabling networking hardware such as an [@https://en.wikipedia.org/wiki/Network_interface_controller ['ethernet adaptor]] to talk to the operating system. This in turn permits running programs to interact with networking using various flavors of interfaces such as [@https://en.wikipedia.org/wiki/Berkeley_sockets ['Berkeley sockets]] or [@https://en.wikipedia.org/wiki/Winsock ['Windows Sockets 2]] ("Winsock").
Networking in C++, represented by __Asio__, [@https://think-async.com/Asio/ Asio], and __NetTS__, provides a layer of abstraction to interact portably with the operating system facilities for not just networking but general [@https://en.wikipedia.org/wiki/Input/output ['input/output]] ("I/O").
Networking in C++, represented by __Asio__, [@https://think-async.com/Asio/ Asio], and __NetTS__, provides a layer of abstraction to interact portably with the operating system facilities for not just networking but general [@https://en.wikipedia.org/wiki/Input/output ['input/output]] ("I/O").
Buffers
Buffers
A [@https://en.wikipedia.org/wiki/Data_buffer ['buffer]] holds a contiguous sequence of bytes used when performing I/O. The types [@boost:/doc/html/boost_asio/reference/const_buffer.html `net::const_buffer`] and [@boost:/doc/html/boost_asio/reference/mutable_buffer.html `net::mutable_buffer`] represent these memory regions as type-safe pointer/size pairs:
A [@https://en.wikipedia.org/wiki/Data_buffer ['buffer]] holds a contiguous sequence of bytes used when performing I/O. The types [@boost:/doc/html/boost_asio/reference/const_buffer.html `net::const_buffer`] and [@boost:/doc/html/boost_asio/reference/mutable_buffer.html `net::mutable_buffer`] represent these memory regions as type-safe pointer/size pairs:
`const_buffer` and `mutable_buffer` are preferred over `std::span<byte>`
`const_buffer` and `mutable_buffer` are preferred over `std::span<byte>`
The concepts __ConstBufferSequence__ and __MutableBufferSequence__ describe bidirectional ranges whose value type is convertible to `const_buffer` and `mutable_buffer` respectively. These sequences allow transacting with multiple buffers in a single function call, a technique called [@https://en.wikipedia.org/wiki/Vectored_I/O ['scatter/gather I/O]]. Buffers and buffer sequences are non-owning; copies produce shallow references and not duplicates of the underlying memory. Each of these statements declares a buffer sequence:
The concepts __ConstBufferSequence__ and __MutableBufferSequence__ describe bidirectional ranges whose value type is convertible to `const_buffer` and `mutable_buffer` respectively. These sequences allow transacting with multiple buffers in a single function call, a technique called [@https://en.wikipedia.org/wiki/Vectored_I/O ['scatter/gather I/O]]. Buffers and buffer sequences are non-owning; copies produce shallow references and not duplicates of the underlying memory. Each of these statements declares a buffer sequence:
The functions [@boost:/doc/html/boost_asio/reference/buffer_size.html `net::buffer_size`] and [@boost:/doc/html/boost_asio/reference/buffer_copy.html `net::buffer_copy`] determine the total number of bytes in a buffer sequence, and transfer some or all of bytes from one buffer sequence to another respectively. The function `buffer_size` is a customization point: user defined overloads in foreign namespaces are possible, and callers should invoke `buffer_size` without namespace qualification. The functions [@boost:/doc/html/boost_asio/reference/buffer_sequence_begin.html `net::buffer_sequence_begin`] and [@boost:/doc/html/boost_asio/reference/buffer_sequence_end.html `net::buffer_sequence_end`] are used to obtain a pair of iterators for traversing the sequence. Beast provides a set of buffer sequence types and algorithms such as [link beast.ref.boost__beast__buffers_cat `buffers_cat`], [link beast.ref.boost__beast__buffers_front `buffers_front`], [link beast.ref.boost__beast__buffers_prefix `buffers_prefix`], [link beast.ref.boost__beast__buffers_range `buffers_range`], and [link beast.ref.boost__beast__buffers_suffix `buffers_suffix`]. This example returns the bytes in a buffer sequence as a string:
The functions [@boost:/doc/html/boost_asio/reference/buffer_size.html `net::buffer_size`] and [@boost:/doc/html/boost_asio/reference/buffer_copy.html `net::buffer_copy`] determine the total number of bytes in a buffer sequence, and transfer some or all of bytes from one buffer sequence to another respectively. The function `buffer_size` is a customization point: user defined overloads in foreign namespaces are possible, and callers should invoke `buffer_size` without namespace qualification. The functions [@boost:/doc/html/boost_asio/reference/buffer_sequence_begin.html `net::buffer_sequence_begin`] and [@boost:/doc/html/boost_asio/reference/buffer_sequence_end.html `net::buffer_sequence_end`] are used to obtain a pair of iterators for traversing the sequence. Beast provides a set of buffer sequence types and algorithms such as [link beast.ref.boost__beast__buffers_cat `buffers_cat`], [link beast.ref.boost__beast__buffers_front `buffers_front`], [link beast.ref.boost__beast__buffers_prefix `buffers_prefix`], [link beast.ref.boost__beast__buffers_range `buffers_range`], and [link beast.ref.boost__beast__buffers_suffix `buffers_suffix`]. This example returns the bytes in a buffer sequence as a string:
The __DynamicBuffer__ concept defines a resizable buffer sequence interface. Algorithms may be expressed in terms of dynamic buffers when the memory requirements are not known ahead of time, for example when reading an HTTP message from a stream. Beast provides a well-rounded collection of dynamic buffer types such as [link beast.ref.boost__beast__buffers_adaptor `buffers_adaptor`], [link beast.ref.boost__beast__flat_buffer `flat_buffer`], [link beast.ref.boost__beast__multi_buffer `multi_buffer`], and [link beast.ref.boost__beast__static_buffer `static_buffer`]. The following function reads data from a [link beast.ref.boost__beast__tcp_stream `tcp_stream`] into a dynamic buffer until it encountering a newline character, using [@boost:/doc/html/boost_asio/reference/buffers_iterator.html `net::buffers_iterator`] to treat the contents of the buffer as a range of characters:
The __DynamicBuffer__ concept defines a resizable buffer sequence interface. Algorithms may be expressed in terms of dynamic buffers when the memory requirements are not known ahead of time, for example when reading an HTTP message from a stream. Beast provides a well-rounded collection of dynamic buffer types such as [link beast.ref.boost__beast__buffers_adaptor `buffers_adaptor`], [link beast.ref.boost__beast__flat_buffer `flat_buffer`], [link beast.ref.boost__beast__multi_buffer `multi_buffer`], and [link beast.ref.boost__beast__static_buffer `static_buffer`]. The following function reads data from a [link beast.ref.boost__beast__tcp_stream `tcp_stream`] into a dynamic buffer until it encountering a newline character, using [@boost:/doc/html/boost_asio/reference/buffers_iterator.html `net::buffers_iterator`] to treat the contents of the buffer as a range of characters:
Synchronous I/O
Synchronous I/O
Synchronous input and output is accomplished through blocking function calls that return with the result of the operation. Such operations typically cannot be canceled and do not have a method for setting a timeout. The __SyncReadStream__ and __SyncWriteStream__ concepts define requirements for ['synchronous streams]: a portable I/O abstraction that transfers data using buffer sequences to represent bytes and either `error_code` or an exception to report any failures. [@boost:/doc/html/boost_asio/reference/basic_stream_socket.html ['net::basic_stream_socket]] is a synchronous stream commonly used to form TCP/IP connections. User-defined types which meet the requirements are possible:
Synchronous input and output is accomplished through blocking function calls that return with the result of the operation. Such operations typically cannot be canceled and do not have a method for setting a timeout. The __SyncReadStream__ and __SyncWriteStream__ concepts define requirements for ['synchronous streams]: a portable I/O abstraction that transfers data using buffer sequences to represent bytes and either `error_code` or an exception to report any failures. [@boost:/doc/html/boost_asio/reference/basic_stream_socket.html ['net::basic_stream_socket]] is a synchronous stream commonly used to form TCP/IP connections. User-defined types which meet the requirements are possible:
A ['synchronous stream algorithm] is written as a function template accepting a stream object meeting the named requirements for synchronous reading, writing, or both. This example shows an algorithm which writes text and uses exceptions to indicate errors:
A ['synchronous stream algorithm] is written as a function template accepting a stream object meeting the named requirements for synchronous reading, writing, or both. This example shows an algorithm which writes text and uses exceptions to indicate errors:
The same algorithm may be expressed using error codes instead of exceptions:
The same algorithm may be expressed using error codes instead of exceptions:
Asynchronous I/O
Asynchronous I/O
English Chinese (Simplified Han script) Actions
Using Networking
Using Networking
Most library stream algorithms require a __socket__, __ssl_stream__, or other __Stream__ object that has already established communication with a remote peer. This example is provided as a reminder of how to work with sockets:
Most library stream algorithms require a __socket__, __ssl_stream__, or other __Stream__ object that has already established communication with a remote peer. This example is provided as a reminder of how to work with sockets:
Throughout this documentation identifiers with the following names have special meaning:
Throughout this documentation identifiers with the following names have special meaning:
Global Variables
Global Variables
Name
Name
Description
Description
[@boost:/doc/html/boost_asio/reference/io_context.html [*`ioc`]]
[@boost:/doc/html/boost_asio/reference/io_context.html [*`ioc`]]
A variable of type __io_context__ which is running on one separate thread, and upon which an __executor_work_guard__ object has been constructed.
A variable of type __io_context__ which is running on one separate thread, and upon which an __executor_work_guard__ object has been constructed.
[@boost:/doc/html/boost_asio/reference/ip__tcp/socket.html [*`sock`]]
[@boost:/doc/html/boost_asio/reference/ip__tcp/socket.html [*`sock`]]
A variable of type [@boost:/doc/html/boost_asio/reference/ip__tcp/socket.html `tcp::socket`] which has already been connected to a remote host.
A variable of type [@boost:/doc/html/boost_asio/reference/ip__tcp/socket.html `tcp::socket`] which has already been connected to a remote host.
[@boost:/doc/html/boost_asio/reference/ssl__stream.html [*`ssl_sock`]]
[@boost:/doc/html/boost_asio/reference/ssl__stream.html [*`ssl_sock`]]
A variable of type [@boost:/doc/html/boost_asio/reference/ssl__stream.html `net::ssl::stream<tcp::socket>`] which is already connected and has handshaked with a remote host.
A variable of type [@boost:/doc/html/boost_asio/reference/ssl__stream.html `net::ssl::stream<tcp::socket>`] which is already connected and has handshaked with a remote host.
[link beast.ref.boost__beast__websocket__stream [*`ws`]]
[link beast.ref.boost__beast__websocket__stream [*`ws`]]
A variable of type [link beast.ref.boost__beast__websocket__stream `websocket::stream<tcp::socket>`] which is already connected with a remote host.
A variable of type [link beast.ref.boost__beast__websocket__stream `websocket::stream<tcp::socket>`] which is already connected with a remote host.
Refresher
Refresher
To use Beast effectively, a prior understanding of Networking is required. This section reviews these concepts as a reminder and guide for further learning.
To use Beast effectively, a prior understanding of Networking is required. This section reviews these concepts as a reminder and guide for further learning.
# `partial`
# `partial`
# `total`
# `total`
A [@https://en.wikipedia.org/wiki/Computer_network ['network]] allows programs located anywhere to exchange information after opting-in to communications by establishing a [@https://en.wikipedia.org/wiki/Data_link ['connection]]. Data may be reliably transferred across a connection in both directions ([@https://en.wikipedia.org/wiki/Duplex_(telecommunications) ['full-duplex]]) with bytes arriving in the same order they were sent. These connections, along with the objects and types used to represent them, are collectively termed [link beast.concepts.streams ['streams]]. The computer or device attached to the network is called a [@https://en.wikipedia.org/wiki/Host_(network) ['host]], and the program on the other end of an established connection is called a [@https://en.wikipedia.org/wiki/Peer-to-peer ['peer]].
A [@https://en.wikipedia.org/wiki/Computer_network ['network]] allows programs located anywhere to exchange information after opting-in to communications by establishing a [@https://en.wikipedia.org/wiki/Data_link ['connection]]. Data may be reliably transferred across a connection in both directions ([@https://en.wikipedia.org/wiki/Duplex_(telecommunications) ['full-duplex]]) with bytes arriving in the same order they were sent. These connections, along with the objects and types used to represent them, are collectively termed [link beast.concepts.streams ['streams]]. The computer or device attached to the network is called a [@https://en.wikipedia.org/wiki/Host_(network) ['host]], and the program on the other end of an established connection is called a [@https://en.wikipedia.org/wiki/Peer-to-peer ['peer]].
The [@https://en.wikipedia.org/wiki/Internet ['internet]] is a global network of interconnected computers that use a variety of standardized communication protocols to exchange information. The most popular protocol is [@https://en.wikipedia.org/wiki/Transmission_Control_Protocol ['TCP/IP]], which this library relies on exclusively. The protocol takes care of the low level details so that applications see a ['stream], which is the reliable, full-duplex connection carrying the ordered set of bytes described above. A [@https://en.wikipedia.org/wiki/Server_(computing) ['server]] is a powerful, always-on host at a well-known network name or network address which provides data services. A [@https://en.wikipedia.org/wiki/Client_(computing) ['client]] is a transient peer which connects to a server to exchange data, and goes offline.
The [@https://en.wikipedia.org/wiki/Internet ['internet]] is a global network of interconnected computers that use a variety of standardized communication protocols to exchange information. The most popular protocol is [@https://en.wikipedia.org/wiki/Transmission_Control_Protocol ['TCP/IP]], which this library relies on exclusively. The protocol takes care of the low level details so that applications see a ['stream], which is the reliable, full-duplex connection carrying the ordered set of bytes described above. A [@https://en.wikipedia.org/wiki/Server_(computing) ['server]] is a powerful, always-on host at a well-known network name or network address which provides data services. A [@https://en.wikipedia.org/wiki/Client_(computing) ['client]] is a transient peer which connects to a server to exchange data, and goes offline.
A vendor supplies a program called a [@https://en.wikipedia.org/wiki/Device_driver ['device driver]], enabling networking hardware such as an [@https://en.wikipedia.org/wiki/Network_interface_controller ['ethernet adaptor]] to talk to the operating system. This in turn permits running programs to interact with networking using various flavors of interfaces such as [@https://en.wikipedia.org/wiki/Berkeley_sockets ['Berkeley sockets]] or [@https://en.wikipedia.org/wiki/Winsock ['Windows Sockets 2]] ("Winsock").
A vendor supplies a program called a [@https://en.wikipedia.org/wiki/Device_driver ['device driver]], enabling networking hardware such as an [@https://en.wikipedia.org/wiki/Network_interface_controller ['ethernet adaptor]] to talk to the operating system. This in turn permits running programs to interact with networking using various flavors of interfaces such as [@https://en.wikipedia.org/wiki/Berkeley_sockets ['Berkeley sockets]] or [@https://en.wikipedia.org/wiki/Winsock ['Windows Sockets 2]] ("Winsock").
Networking in C++, represented by __Asio__, [@https://think-async.com/Asio/ Asio], and __NetTS__, provides a layer of abstraction to interact portably with the operating system facilities for not just networking but general [@https://en.wikipedia.org/wiki/Input/output ['input/output]] ("I/O").
Networking in C++, represented by __Asio__, [@https://think-async.com/Asio/ Asio], and __NetTS__, provides a layer of abstraction to interact portably with the operating system facilities for not just networking but general [@https://en.wikipedia.org/wiki/Input/output ['input/output]] ("I/O").
Buffers
Buffers
A [@https://en.wikipedia.org/wiki/Data_buffer ['buffer]] holds a contiguous sequence of bytes used when performing I/O. The types [@boost:/doc/html/boost_asio/reference/const_buffer.html `net::const_buffer`] and [@boost:/doc/html/boost_asio/reference/mutable_buffer.html `net::mutable_buffer`] represent these memory regions as type-safe pointer/size pairs:
A [@https://en.wikipedia.org/wiki/Data_buffer ['buffer]] holds a contiguous sequence of bytes used when performing I/O. The types [@boost:/doc/html/boost_asio/reference/const_buffer.html `net::const_buffer`] and [@boost:/doc/html/boost_asio/reference/mutable_buffer.html `net::mutable_buffer`] represent these memory regions as type-safe pointer/size pairs:
`const_buffer` and `mutable_buffer` are preferred over `std::span<byte>`
`const_buffer` and `mutable_buffer` are preferred over `std::span<byte>`
The concepts __ConstBufferSequence__ and __MutableBufferSequence__ describe bidirectional ranges whose value type is convertible to `const_buffer` and `mutable_buffer` respectively. These sequences allow transacting with multiple buffers in a single function call, a technique called [@https://en.wikipedia.org/wiki/Vectored_I/O ['scatter/gather I/O]]. Buffers and buffer sequences are non-owning; copies produce shallow references and not duplicates of the underlying memory. Each of these statements declares a buffer sequence:
The concepts __ConstBufferSequence__ and __MutableBufferSequence__ describe bidirectional ranges whose value type is convertible to `const_buffer` and `mutable_buffer` respectively. These sequences allow transacting with multiple buffers in a single function call, a technique called [@https://en.wikipedia.org/wiki/Vectored_I/O ['scatter/gather I/O]]. Buffers and buffer sequences are non-owning; copies produce shallow references and not duplicates of the underlying memory. Each of these statements declares a buffer sequence:
The functions [@boost:/doc/html/boost_asio/reference/buffer_size.html `net::buffer_size`] and [@boost:/doc/html/boost_asio/reference/buffer_copy.html `net::buffer_copy`] determine the total number of bytes in a buffer sequence, and transfer some or all of bytes from one buffer sequence to another respectively. The function `buffer_size` is a customization point: user defined overloads in foreign namespaces are possible, and callers should invoke `buffer_size` without namespace qualification. The functions [@boost:/doc/html/boost_asio/reference/buffer_sequence_begin.html `net::buffer_sequence_begin`] and [@boost:/doc/html/boost_asio/reference/buffer_sequence_end.html `net::buffer_sequence_end`] are used to obtain a pair of iterators for traversing the sequence. Beast provides a set of buffer sequence types and algorithms such as [link beast.ref.boost__beast__buffers_cat `buffers_cat`], [link beast.ref.boost__beast__buffers_front `buffers_front`], [link beast.ref.boost__beast__buffers_prefix `buffers_prefix`], [link beast.ref.boost__beast__buffers_range `buffers_range`], and [link beast.ref.boost__beast__buffers_suffix `buffers_suffix`]. This example returns the bytes in a buffer sequence as a string:
The functions [@boost:/doc/html/boost_asio/reference/buffer_size.html `net::buffer_size`] and [@boost:/doc/html/boost_asio/reference/buffer_copy.html `net::buffer_copy`] determine the total number of bytes in a buffer sequence, and transfer some or all of bytes from one buffer sequence to another respectively. The function `buffer_size` is a customization point: user defined overloads in foreign namespaces are possible, and callers should invoke `buffer_size` without namespace qualification. The functions [@boost:/doc/html/boost_asio/reference/buffer_sequence_begin.html `net::buffer_sequence_begin`] and [@boost:/doc/html/boost_asio/reference/buffer_sequence_end.html `net::buffer_sequence_end`] are used to obtain a pair of iterators for traversing the sequence. Beast provides a set of buffer sequence types and algorithms such as [link beast.ref.boost__beast__buffers_cat `buffers_cat`], [link beast.ref.boost__beast__buffers_front `buffers_front`], [link beast.ref.boost__beast__buffers_prefix `buffers_prefix`], [link beast.ref.boost__beast__buffers_range `buffers_range`], and [link beast.ref.boost__beast__buffers_suffix `buffers_suffix`]. This example returns the bytes in a buffer sequence as a string:
The __DynamicBuffer__ concept defines a resizable buffer sequence interface. Algorithms may be expressed in terms of dynamic buffers when the memory requirements are not known ahead of time, for example when reading an HTTP message from a stream. Beast provides a well-rounded collection of dynamic buffer types such as [link beast.ref.boost__beast__buffers_adaptor `buffers_adaptor`], [link beast.ref.boost__beast__flat_buffer `flat_buffer`], [link beast.ref.boost__beast__multi_buffer `multi_buffer`], and [link beast.ref.boost__beast__static_buffer `static_buffer`]. The following function reads data from a [link beast.ref.boost__beast__tcp_stream `tcp_stream`] into a dynamic buffer until it encountering a newline character, using [@boost:/doc/html/boost_asio/reference/buffers_iterator.html `net::buffers_iterator`] to treat the contents of the buffer as a range of characters:
The __DynamicBuffer__ concept defines a resizable buffer sequence interface. Algorithms may be expressed in terms of dynamic buffers when the memory requirements are not known ahead of time, for example when reading an HTTP message from a stream. Beast provides a well-rounded collection of dynamic buffer types such as [link beast.ref.boost__beast__buffers_adaptor `buffers_adaptor`], [link beast.ref.boost__beast__flat_buffer `flat_buffer`], [link beast.ref.boost__beast__multi_buffer `multi_buffer`], and [link beast.ref.boost__beast__static_buffer `static_buffer`]. The following function reads data from a [link beast.ref.boost__beast__tcp_stream `tcp_stream`] into a dynamic buffer until it encountering a newline character, using [@boost:/doc/html/boost_asio/reference/buffers_iterator.html `net::buffers_iterator`] to treat the contents of the buffer as a range of characters:
Synchronous I/O
Synchronous I/O
Synchronous input and output is accomplished through blocking function calls that return with the result of the operation. Such operations typically cannot be canceled and do not have a method for setting a timeout. The __SyncReadStream__ and __SyncWriteStream__ concepts define requirements for ['synchronous streams]: a portable I/O abstraction that transfers data using buffer sequences to represent bytes and either `error_code` or an exception to report any failures. [@boost:/doc/html/boost_asio/reference/basic_stream_socket.html ['net::basic_stream_socket]] is a synchronous stream commonly used to form TCP/IP connections. User-defined types which meet the requirements are possible:
Synchronous input and output is accomplished through blocking function calls that return with the result of the operation. Such operations typically cannot be canceled and do not have a method for setting a timeout. The __SyncReadStream__ and __SyncWriteStream__ concepts define requirements for ['synchronous streams]: a portable I/O abstraction that transfers data using buffer sequences to represent bytes and either `error_code` or an exception to report any failures. [@boost:/doc/html/boost_asio/reference/basic_stream_socket.html ['net::basic_stream_socket]] is a synchronous stream commonly used to form TCP/IP connections. User-defined types which meet the requirements are possible:

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To use Beast effectively, a prior understanding of Networking is required. This section reviews these concepts as a reminder and guide for further learning.
To use Beast effectively, a prior understanding of Networking is required. This section reviews these concepts as a reminder and guide for further learning.
06/05/2026
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