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 an older version of Boost and was released in 2019. The current version is 1.90.0.
Examples
Features
Fixes
Improvements
buffers_cat
detect_ssl uses
bool instead of tribool
static_string
in HTTP parser
steady_timer
type
static_string
http::string_to_verb
operation_aborted
on partial message
<experimental/unit_test/thread.hpp>
filter_token_list
bind_executor
in basic_stream
static_string
from http::fields
static_string
in websocket
asio::coroutine
in flat_stream
Fixes
allocator_traits::construct
is used for user-defined types
get_executor
const-correctness
async_detect_ssl
handler type
buffers
function
flat_buffer
copy members
buffers_cat iterator
tests
beast::iequals
in basic_parser.ipp
Documentation
![[Tip]](../../../../../doc/src/images/tip.png) |
Tip |
|---|---|
The namespace alias |
New Features
net::async_initiate internally.
tcp_stream and basic_stream support:
async_read_some, async_write_some complete
with error::timeout on expiration.
simple and unlimited, or a user-defined
RatePolicy.
websocket::stream supports
ssl_stream
is a public interface
flat_buffer,
flat_static_buffer, multi_buffer, and static_buffer:
data()
returns a mutable buffer sequence
cdata()
to also return constant readable bytes
noexcept
flat_buffer,
multi_buffer
clear, reserve(),
max_size(),
shrink_to_fit()
max_size()
bind_front_handler
static_buffer,
flat_static_buffer
clear()
noexcept
http::string_to_field
clear operations
perserve capacity.
is_const_buffer_sequence
is_mutable_buffer_sequence
buffers_iterator_type
buffers_type
async_base,
stable_async_base
allocate_stable
is preferred over handler_ptr
buffer_bytes replacement
for net::buffer_size
saved_handler
buffers_range_ref
executor_type
get_lowest_layer,
lowest_layer_type
close_socket, beast_close_socket
error, condition
flat_stream, detect_ssl, async_detect_ssl.
Documentation
API Changes
handler_ptr is deprecated.
Actions Required: Use stable_async_base
and allocate_stable instead.
http::read
or http::async_read overloads should adjust
the usage of the returned value as needed.
has_get_executor,
is_sync_stream, is_sync_read_stream, is_sync_write_stream,
is_async_stream, is_async_read_stream, and is_async_write_stream are in stream_traits.hpp.
Actions Required: Include stream_traits.hpp as needed.
basic_parser is abstract.
Actions Required
basic_parser
type to omit the Derived
template parameter
basic_parser
no longer need to friend the base.
override.
is_file is
in file_base.hpp. Actions Required: Include file_base.hpp
as needed.
flat_static_buffer::reset()
is deprecated. Actions Required:
clear()
instead.
buffers_adapter is spelled
buffers_adaptor. Actions
Required:
buffers_adapter
with buffers_adaptor,
or define BOOST_BEAST_ALLOW_DEPRECATED.
buffers is spelled make_printable. Actions Required:
buffers with
make_printable, and
include "make_printable.hpp" instead of "ostream.hpp".
file_mode::append_new is removed, as it makes no
sense. Actions Required: - Replace file_mode::append_new
with either file_mode::append or file_mode::append_existing
as needed.
role_type is moved from
websocket to beast
buffers_range_ref is preferred
to std::reference_wrapper. Actions
Required: - Call buffers_range_ref
with the buffer, instead of calling buffers_range
with a reference wrapper constructed from the buffer.
lowest_layer and
lowest_layer_type are removed.
Actions Required: Use the free function get_lowest_layer and the type trait
lowest_layer_type instead.
accept,
accept_ex - handshake, handshake_ex
- async_accept,
async_accept_ex -
async_handshake,
async_handshake_ex
basic_parser::content_length
no longer changes as the body of the message is received. Actions
Required: Call basic_parser::content_length_remaining
instead of basic_parser::content_length
in order to determine the remaining number of bytes in the body.
Examples
tcp_stream with
timeouts (HTTP)
ssl_stream
bind_front_handler
flat_buffer
async_echo works with move-only
handlers
Fixes
ssl_stream
for Asio changes
websocket::stream
http::message is not-a boost::empty_value
test::stream has fewer dependencies
session_alloc
is thread-safe
test::stream maintains a handler work guard
buffers_cat correctly skips
empty buffers when iterated
ostream does not overflow
or exceed the dynamic buffer's maximum size
test::stream::async_read
file_mode::append_existing works correctly
New Videos
New Features
BOOST_BEAST_USE_STD_STRING_VIEW
Examples
Fixes
boost::empty_value
basic_fields uses intrusive base
hooks
BOOST_NO_EXCEPTIONS
Experimental
timeout_socket
This version fixes a missing executor work guard in all composed operations used in the implementation. Users who are experiencing crashes related to asynchronous completion handlers are encouraged to upgrade. Also included is an improved mechanism for generating random numbers used to mask outgoing websocket frames when operating in the client mode. This resolves a vulnerability described in the Beast Hybrid Assessment Report from Bishop Fox.
New Features
The include directory <beast/experimental> contains features which are not part of
the stable public interface but are available anyway. They may change in future
versions.
flat_stream for working around
an SSL stream performance limitation
http::icy_stream stream filter allows
parsing ICY HTTP response handshakes
ssl_stream
for better SSL performance and move constructability
test::connect,
test::error,
test::fail_count,
and test::stream
utilities for writing unit tests.
http::is_mutable_body_writer metafunction
websocket::seed_prng for manually providing
entropy to the PRNG
websocket::stream::secure_prng to control whether
the connection uses a secure PRNG
Improvements
buffers_adaptor
handler_ptr::has_value
Fixes
const and
non-const overloads for message
based HTTP writes
bind_handler
http::parser constructor javadoc
buffers_adaptor iterator value
type
buffers_adaptor::max_size
buffers_prefix iterator decrement
Breaking Changes
serializer::reader_impl
reader and writer ctor signatures
This version fixes significant defects in websocket::stream which can lead to asserts or
undefined behavior. Users are encouraged to update to the latest Boost release.
New Features
bool
template parameter to websocket::stream When deflateSupported
is true, the stream will be
capable of negotiating the permessage-deflate websocket extension per the
configured run-time settings. When deflateSupported
is false, the stream will
never negotiate the permessage-deflate websocket extension. Furthermore,
all of the code necessary for implementing the permessage-deflate extension
will be excluded from function instantiations. Programs which set deflateSupported to false
when instantiating streams will be smaller.
websocket::error::failed and websocket::error::handshake_failed
are removed. Actions required: Code which explicitly compares error_code values against the constant
websocket::error::handshake_failed should compare against
websocket::condition::handshake_failed instead. Code
which explicitly compares error_code values against the constant websocket::error::failed should compare against websocket::condition::protocol_violation instead.
Improvements
http::basic_fields uses less storage
http::basic_fields exception specifiers
are provided
asio::null_buffers
<boost/beast/websocket/stream_fwd.hpp>
bind_handler
works with boost placeholders
reuse_address(true)
Fixes
ssl_stream
special members
<algorithm> are protected from macros
http::basic_fields::erase
bind_handler doc
"ws_.wr_block_ == tok_".
API Changes
handler_ptr.
Actions required: don't call non-public members.
handler_ptr is a move-only
type, with unique_ptr semantics.
Actions required: user-defined composed operations using handler_ptr to manage state can only
be moved, not copied.
handler_ptr gives the strong
exception guarantee. The constructor signature for managed objects constructed
by handler_ptr now receives
a const reference to the handler.
Actions required: Change the constructor signature for state objects used
with handler_ptr to receive
a const reference to the handler.
http::basic_fields does not support
fancy pointers
http::parser
is no longer MoveConstructible
http::serializer::reader_impl is deprecated and will be
removed in the next release. Actions required: Call http::serializer::writer_impl instead of serializer::reader_impl.
http::header and value_type
objects. This enables the composition of body types. The previous single-argument
constructors are deprecated and will be removed in the next version. Actions
required: Change user-defined instances of BodyReader
or BodyWriter
constructor signatures to the two-argument form. Alternatively. define
the macro BOOST_BEAST_ALLOW_DEPRECATED
in the project (which will cause both the new and the deprecated signatures
to be accepted).
websocket::stream::control_callback now copies or
moves the function object.
get_lowest_layer
is now a type alias. Actions required: Replace instances of typename get_lowest_layer<T>::type
with get_lowest_layer<T>.