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

[Jonathan Wakely]

On 16/03/20 22:54 +0000, Jonathan Wakely wrote:
>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.
>
>	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.

LWG preferred to make the constrcutor public, so this patch does that.

Tested x86_64-linux, committed to master.


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