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

4 May 2020


      I'm all set.

Thanks !!!


On 5/2/20 10:44 AM, Richard Hodges via Boost-users wrote:
...
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 
mailto: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
---------------------
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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