https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89128
Bug ID: 89128
Summary: Missing CTAD deduction guides for std::stack and
std::queue
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: arthur.j.odwyer at gmail dot com
Target Milestone: ---
https://godbolt.org/z/IdXUBQ
std::deque<int> dq;
auto st = std::stack{dq};
This should be deduced as equivalent to
auto st = std::stack<int, std::deque<int>>{dq};
because of the deduction guide in http://eel.is/c++draft/stack.defn
template<class Container>
stack(Container) -> stack<typename Container::value_type, Container>;
Instead, libstdc++ gives an error.
It looks to me as if nobody's gotten around to putting the required deduction
guides in /libstdc++-v3/include/bits/stl_stack.h yet.
----
Same deal for std::queue:
std::list<int> lst;
auto q = std::queue{lst};
should be deduced as equivalent to
auto q = std::queue<int, std::list<int>>{lst};
