[Bug libstdc++/94199] std::experimental::net::v1::make_service function template not instantiatable

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94199

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:

https://gcc.gnu.org/g:31b204ace293b81fc51f76bf9faf459ab1cd7c50

commit r9-8381-g31b204ace293b81fc51f76bf9faf459ab1cd7c50
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Mar 16 22:55:48 2020 +0000

    libstdc++: Add default constructor to net::service_already_exists (PR
94199)

    The service_already_exists exception type specified in the TS doesn't
    have any constructors defined. Since its base class isn't default
    constructible, that means has no usable constructors. This may be a
    defect in the TS.

    This patch fixes it by adding a default constructor, but making it
    private. The make_service function is declared as a friend to be able to
    call that private constructor.

    Backport from mainline
    2020-03-16  Jonathan Wakely  <jwakely@redhat.com>

            PR libstdc++/94199
            * include/experimental/executor (service_already_exists): Add
default
            constructor. Declare make_service to be a friend.
            * testsuite/experimental/net/execution_context/make_service.cc: New
            test.