Compile error with boost 1.71

[jochenjagers]

Hello,

since Arch Linux updated boost to version 1.71, I'm not longer able to compile my application using websocketpp (Version 0.8.1). With boost 1.69 everything is working.

In file included from /usr/include/boost/asio/executor.hpp:338,
                 from /usr/include/boost/asio/basic_waitable_timer.hpp:27,
                 from /usr/include/boost/asio/steady_timer.hpp:22,
                 from /usr/include/websocketpp/common/asio.hpp:61,
                 from /usr/include/websocketpp/transport/asio/base.hpp:31,
                 from /usr/include/websocketpp/transport/asio/connection.hpp:31,
                 from /usr/include/websocketpp/transport/asio/endpoint.hpp:32,
                 from /usr/include/websocketpp/config/asio_no_tls.hpp:32,
                 from ...,

/usr/include/boost/asio/impl/executor.hpp: In instantiation of 'boost::asio::execution_context& boost::asio::executor::impl< <template-parameter-1-1>, <template-parameter-1-2> >::context() [with Executor = std::reference_wrapper<boost::asio::io_context>; Allocator = std::allocator<void>]':
/usr/include/boost/asio/impl/executor.hpp:177:22:   required from here
/usr/include/boost/asio/impl/executor.hpp:179:22: error: 'class std::reference_wrapper<boost::asio::io_context>' has no member named 'context'
  179 |     return executor_.context();
      |            ~~~~~~~~~~^~~~~~~
/usr/include/boost/asio/impl/executor.hpp: In instantiation of 'void boost::asio::executor::impl< <template-parameter-1-1>, <template-parameter-1-2> >::on_work_started() [with Executor = std::reference_wrapper<boost::asio::io_context>; Allocator = std::allocator<void>]':
/usr/include/boost/asio/impl/executor.hpp:167:8:   required from here
/usr/include/boost/asio/impl/executor.hpp:169:15: error: 'class std::reference_wrapper<boost::asio::io_context>' has no member named 'on_work_started'
  169 |     executor_.on_work_started();
      |     ~~~~~~~~~~^~~~~~~~~~~~~~~
/usr/include/boost/asio/impl/executor.hpp: In instantiation of 'void boost::asio::executor::impl< <template-parameter-1-1>, <template-parameter-1-2> >::on_work_finished() [with Executor = std::reference_wrapper<boost::asio::io_context>; Allocator = std::allocator<void>]':
/usr/include/boost/asio/impl/executor.hpp:172:8:   required from here
/usr/include/boost/asio/impl/executor.hpp:174:15: error: 'class std::reference_wrapper<boost::asio::io_context>' has no member named 'on_work_finished'
  174 |     executor_.on_work_finished();
      |     ~~~~~~~~~~^~~~~~~~~~~~~~~~
/usr/include/boost/asio/impl/executor.hpp: In instantiation of 'void boost::asio::executor::impl< <template-parameter-1-1>, <template-parameter-1-2> >::dispatch(boost::asio::executor::function&&) [with Executor = std::reference_wrapper<boost::asio::io_context>; Allocator = std::allocator<void>]':
/usr/include/boost/asio/impl/executor.hpp:182:8:   required from here
/usr/include/boost/asio/impl/executor.hpp:184:15: error: 'class std::reference_wrapper<boost::asio::io_context>' has no member named 'dispatch'
  184 |     executor_.dispatch(BOOST_ASIO_MOVE_CAST(function)(f), allocator_);
      |     ~~~~~~~~~~^~~~~~~~
/usr/include/boost/asio/impl/executor.hpp: In instantiation of 'void boost::asio::executor::impl< <template-parameter-1-1>, <template-parameter-1-2> >::post(boost::asio::executor::function&&) [with Executor = std::reference_wrapper<boost::asio::io_context>; Allocator = std::allocator<void>]':
/usr/include/boost/asio/impl/executor.hpp:187:8:   required from here
/usr/include/boost/asio/impl/executor.hpp:189:15: error: 'class std::reference_wrapper<boost::asio::io_context>' has no member named 'post'
  189 |     executor_.post(BOOST_ASIO_MOVE_CAST(function)(f), allocator_);
      |     ~~~~~~~~~~^~~~
/usr/include/boost/asio/impl/executor.hpp: In instantiation of 'void boost::asio::executor::impl< <template-parameter-1-1>, <template-parameter-1-2> >::defer(boost::asio::executor::function&&) [with Executor = std::reference_wrapper<boost::asio::io_context>; Allocator = std::allocator<void>]':
/usr/include/boost/asio/impl/executor.hpp:192:8:   required from here
/usr/include/boost/asio/impl/executor.hpp:194:15: error: 'class std::reference_wrapper<boost::asio::io_context>' has no member named 'defer'
  194 |     executor_.defer(BOOST_ASIO_MOVE_CAST(function)(f), allocator_);
      |     ~~~~~~~~~~^~~~~
/usr/include/boost/asio/impl/executor.hpp: In instantiation of 'bool boost::asio::executor::impl< <template-parameter-1-1>, <template-parameter-1-2> >::equals(const boost::asio::executor::impl_base*) const [with Executor = std::reference_wrapper<boost::asio::io_context>; Allocator = std::allocator<void>]':
/usr/include/boost/asio/impl/executor.hpp:212:8:   required from here
/usr/include/boost/asio/impl/executor.hpp:218:22: error: no match for 'operator==' (operand types are 'const std::reference_wrapper<boost::asio::io_context>' and 'const std::reference_wrapper<boost::asio::io_context>')
  218 |     return executor_ == *static_cast<const Executor*>(e->target());
      |            ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Greetings,
Jochen

[AlastairGrowcott]

This is a duplicate. See also #794. This has links to the same issue in many dependent projects,

That issue was 8 months ago. Maybe it was fixed in the development branch which I see is still active. There are pull requests going back years that have apparently had no attention, so who knows.

[ahmadov]

I also had the same problem on Arch Linux. Seems the only way to fix the issue is downgrading the boost-libs and boost. I downgraded the packages and it worked.

First, you have to downgrade boost-libs then boost package. Downgrading the packages can be done with these commands:
boost-libs: pacman -U https://archive.archlinux.org/packages/b/boost-libs/boost-libs-1.69.0-2-x86_64.pkg.tar.xz

boost: pacman -U https://archive.archlinux.org/packages/b/boost/boost-1.69.0-2-x86_64.pkg.tar.xz

[jochenjagers]

Thanks for the hints. But downgrading boost brings many other proglems.
I took over the aur package websockerpp-git-dev which installs the current development version of websocketpp. It works fine with the actual boost version.

https://aur.archlinux.org/packages/websocketpp-git-dev/

[zaphoyd]

The fix for this issue has been available on the develop branch for some time and has now been published in release 0.8.2