Boost 1.70.0 released

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Boost 1.70.0 released

From the release notes:

New Libraries​
  • Outcome: A set of tools for reporting and handling function failures in contexts where directly using C++ exception handling is unsuitable, from Niall Douglas.
  • Histogram: Fast and extensible multi-dimensional histograms with convenient interface for C++14, from Hans Dembinski.
Updated Libraries​
  1. Asio:
  • Fixed a Windows-specific memory leak that may occur when system_executor is used.
  • Improved dispatch, post and defer documentation.
  • Fixed compile errors that occur when using the composed read and write operations with MSVC 11.0.
  • Fixed a macOS-specific warning about the deprecation of OSMemoryBarrier.
  • Changed composed asynchronous read and write operations to move buffer sequence objects.
  • Added a fallback error code for when we OpenSSL produces an SSL_ERROR_SYSCALL result without an associated error.
  • Suppressed the eof error on SSL shutdown as it actually indicates success.
  • Ensured SSL handshake errors are propagated to the peer before the local operation completes.
  • Fixed buffer_sequence_begin and buffer_sequence_end to prevent implicit conversion.
  • Changed the range-based asynchronous connect operation to deduce the EndpointSequence iterator type.
  • Fixed calculation of absolute timeout when the backend uses pthread_cond_timedwait.
  • Changed receive operations to return the correct number of bytes transferred when truncation (error::message_size) occurs on a datagram-oriented socket.
  • Enabled recycling of the memory used to type-erase a function object with the polymorphic executor.
  • Added a new BOOST_ASIO_DISABLE_VISIBILITY configuration #define.
  • Added the noexcept qualifier to various functions.
  • Added a constructor for local::basic_endpoint that takes a string_view.
  • Relaxed the completion condition type requirements to only require move-constructibility rather than copy-constructibility.
  • Added a make_strand helper function.
  • Added a new async_compose function that simplifies the implementation of user-defined asynchronous operations.
  • Added a new DynamicBuffer_v2 concept which is CopyConstructible.
  • Updated the Coroutines TS support and promoted it to the asio namespace.
  • Added a new async_result form with an initiate static member function.
  • Added the ability to use custom I/O executors with I/O objects (such as sockets).
  • This release includes a number of new features, bug fixes, performance enhancements, and documentation improvements. Notable changes include:
  • Consult the Revision History for further details.

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