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Jonathan Wakely 6fd4b25b50 Add noexcept-specifier to std::apply and std::make_from_tuple
When unpacking a std::tuple we know that the std::get calls are
noexcept, so only the invocation (for std::apply) and construction (for
std::make_from_tuple) can throw.

We also know the std::get calls won't throw for a std::array, but this
patch doesn't specialize the variable template for std::array. For an
arbitrary tuple-like type we don't know if the std::get calls will
throw, and so just use a potentially-throwing noexcept-specifier.

	* include/std/tuple (__unpack_std_tuple): New variable template and
	partial specializations.
	(apply, make_from_tuple): Add noexcept-specifier.
	* testsuite/20_util/tuple/apply/2.cc: New test.
	* testsuite/20_util/tuple/make_from_tuple/2.cc: New test.

From-SVN: r274312
2019-08-12 15:54:12 +01:00
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