Deduce the return type of queue::emplace
and stack::emplace
#4980
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Followup to #4963. Fixes VSO-2261359 / AB#2261359 "[VCPKG] rocksdb installation failed with error C2440":
As the container adaptors are required to use
decltype(auto)
in C++17, the "warning C5046: Symbol involving type with internal linkage not defined" in theconvertible_to_any
scenario and the ODR violation when mixing C++14 and C++17 TUs are unavoidable.In
<xmemory>
, I'm lexicographically sorting_ADAPTOR_EMPLACE_RETURN
before_CONTAINER_EMPLACE_RETURN
, which will avoid an adjacent-add conflict with #4975 adding_LIST_REMOVE_RETURN
(also in lex order).