Adding noexcept-specification on tuple constructors (LWG 2899)

[Nina Dinka Ranns]

Tested on Linux-PPC64
Adding noexcept-specification on tuple constructors (LWG 2899)


2019-04-13 Nina Dinka Ranns <dinka.ranns@gmail.com>

        Adding noexcept-specification on tuple constructors (LWG 2899)
        * libstdc++-v3/include/std/tuple:
        (tuple()): Add noexcept-specification.
        (tuple(const _Elements&...)): Likewise
        (tuple(_UElements&&...)): Likewise
        (tuple(const tuple<_UElements...>&)): Likewise
        (tuple(tuple<_UElements...>&&)): Likewise
        (tuple(const _T1&, const _T2&)): Likewise
        (tuple(_U1&&, _U2&&)): Likewise
        (tuple(const tuple<_U1, _U2>&): Likewise
        (tuple(tuple<_U1, _U2>&&): Likewise
        (tuple(const pair<_U1, _U2>&): Likewise
        (tuple(pair<_U1, _U2>&&): Likewise


        * libstdc++-v3/testsuite/20_util/tuple/cons/noexcept_specs.cc: New
        * libstdc++-v3/testsuite/20_util/tuple/cons/noexcept_specs2.cc: New
        * libstdc++-v3/testsuite/20_util/tuple/cons/noexcept_specs3.cc: New
        * libstdc++-v3/testsuite/20_util/tuple/cons/noexcept_specs4.cc: New
        * libstdc++-v3/testsuite/20_util/tuple/cons/noexcept_specs5.cc: New
        * libstdc++-v3/testsuite/20_util/tuple/cons/noexcept_specs6.cc: New
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