Add nullptr constructor overload for ref_ptr #1113
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This time, use decltype(nullptr) instead of std::nullptr_t as the latter requires <cstddef>. The standard guarantees that these are the same type.
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This time, use
decltype(nullptr)instead ofstd::nullptr_tas the latter requires<cstddef>. The standard guarantees that these are the same type.I've actually built this with GCC and libstdc++ this time, so know it doesn't cause problems.