[committed] libstdc++: Simplify noexcept-specifiers for move constructors

[Jonathan Wakely]

On 08/04/21 17:50 +0100, Jonathan Wakely wrote:
>This puts the logic for the noexcept-specifier in one place, and then
>reuses it elsewhere. This means checking whether the move constructor
>can throw doesn't need to do overload resolution and then check whether
>some other constructor can throw, we just get the answer directly.
>
>libstdc++-v3/ChangeLog:
>
>	* include/bits/hashtable.h (_Hashtable::_S_nothrow_move()):
>	New function to determine noexcept-specifier for move
>	constructors.
>	(_Hashtable): Use _S_nothrow_move() on move constructors.
>	* testsuite/23_containers/unordered_map/cons/noexcept_move_construct.cc:
>	Correct static assertion message.
>	* testsuite/23_containers/unordered_multimap/cons/noexcept_move_construct.cc:
>	Likewise.
>	* testsuite/23_containers/unordered_multiset/cons/noexcept_move_construct.cc:
>	Likewise.
>	* testsuite/23_containers/unordered_set/cons/noexcept_move_construct.cc:
>	Likewise.
>

I keep forgetting that a constexpr function in C++11 has to be a single
return statement.

I'm testing this patch now and will push to trunk and backport to the
branches where I already backported the breakage (facepalm).


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