Christopher Di Bella 546449938a [libcxx][optional] adds missing constexpr operations ... Makes the following operations constexpr: * `std::swap(optional, optional)` * `optional(optional<U> const&)` * `optional(optional<U>&&)` * `~optional()` * `operator=(nullopt_t)` * `operator=(U&&)` * `operator=(optional<U> const&)` * `operator=(optional<U>&&)` * `emplace(Args&&...)` * `emplace(initializer_list<U>, Args&&...)` * `swap(optional&)` * `reset()` P2231 has been accepted by plenary, with the committee recommending implementers retroactively apply to C++20. It's necessary for us to implement _`semiregular-box`_ and _`non-propagating-cache`_, both of which are required for ranges (otherwise we'll need to reimplement `std::optional` with these members `constexpr`ified). Differential Revision: https://reviews.llvm.org/D102119		2021-06-10 05:52:47 +00:00
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assign_value.pass.cpp	[libc++] NFC: Normalize links to bug reports	2021-03-03 13:45:29 -05:00
const_optional_U.pass.cpp	[libc++] Remove the c++98 Lit feature from the test suite	2020-06-03 09:37:22 -04:00
copy.pass.cpp	[libc++] Remove the c++98 Lit feature from the test suite	2020-06-03 09:37:22 -04:00
emplace.pass.cpp	[libcxx][optional] adds missing constexpr operations	2021-06-10 05:52:47 +00:00
emplace_initializer_list.pass.cpp	[libcxx][optional] adds missing constexpr operations	2021-06-10 05:52:47 +00:00
move.pass.cpp	[libc++] Remove the c++98 Lit feature from the test suite	2020-06-03 09:37:22 -04:00
nullopt_t.pass.cpp	[libcxx][optional] adds missing constexpr operations	2021-06-10 05:52:47 +00:00
optional_U.pass.cpp	[libcxx][optional] adds missing constexpr operations	2021-06-10 05:52:47 +00:00