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From: "hahayes12 at tutanota dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/100482] New: namespaces as int in decltype expression
Date: Sat, 08 May 2021 02:45:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100482

            Bug ID: 100482
           Summary: namespaces as int in decltype expression
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hahayes12 at tutanota dot com
  Target Milestone: ---

case:

#include <iostream>
int main() {
    decltype(std) i{1};
    std::cout << i;
}

g++ main.cpp

./a.out
1


as you can see namespaces are usable in decltype expressions and treated as
ints.=