[llvm-bugs] [Bug 32133] New: make_optional doesn't accept initializer list and parameter pack

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32133

            Bug ID: 32133
           Summary: make_optional doesn't accept initializer list and
                    parameter pack
           Product: libc++
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: hocheung20 at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

According to n4618 p. 558
(http://open-std.org/JTC1/SC22/WG21/docs/papers/2016/n4618.pdf):

There will be 3 versions of make_optional, 2 of which are currently
unimplemented by libc++:

Implemented:
template <class T> constexpr optional<decay_t<T>> make_optional(T&& v);

Unimplemented:
template <class T, class...Args> constexpr optional<T> make_optional(Args&&...
args);
template <class T, class U, class... Args> constexpr optional<T>
make_optional(initializer_list<U> il, Args&&... args);

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