Re: [Boost-users] Boost 1.73, beast and -fconcepts

Hi David, There was a last-minute change to Asio just before the release of boost 1.73 and we didn't catch the fact that this, while fixing Asio for gcc-9 -fconcepts, `gcc-10 -std=c++20` and `clang-10 -std=c++20`, it cause Beast to break. I have committed a fix to boostorg/beast develop branch. Please get in touch if you need help patching your boost-1.73 sources. Either by email or on cpplang slack in the #beast channel. https://cppalliance.org/#links On Sat, 2 May 2020 at 15:31, David P. Riedel via Boost-users < boost-users@lists.boost.org> wrote:

Hi

It seems that beast still does not work with gcc 9.3 and -fconcepts.

If I try to build the beast test programs using -fconcepts, I still get a lot of errors such as those below.

I thought this was fixed in 1.73.

????

Thanks

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In file included from ../../../boost/beast/core/basic_stream.hpp:1457, from ../../../boost/beast/core.hpp:16, from doc/core_snippets.cpp:19: ../../../boost/beast/core/impl/basic_stream.hpp:781:1: error: no declaration matches ‘auto boost::beast::basic_stream< <template-parameter-1-1>, <template-parameter-1-2>, <template-parameter-1-3> >::async_connect(const endpoint_type&, ConnectHandler&&)’ 781 | basic_stream:: | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from ../../../boost/beast/core.hpp:16, from doc/core_snippets.cpp:19: ../../../boost/beast/core/basic_stream.hpp:1202:5: note: candidates are: ‘template template requires completion_token_for typename boost::asio::async_result::return_type boost::beast::basic_stream< <template-parameter-1-1>, <template-parameter-1-2>, <template-parameter-1-3> >::async_connect(Iterator, Iterator, ConnectCondition, IteratorConnectHandler&&)’ 1202 | async_connect( | ^~~~~~~~~~~~~ ../../../boost/beast/core/basic_stream.hpp:1141:5: note: ‘template template requires completion_token_for typename boost::asio::async_result::return_type boost::beast::basic_stream< <template-parameter-1-1>, <template-parameter-1-2>, <template-parameter-1-3> >::async_connect(Iterator, Iterator, IteratorCon

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