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From: "oliver.rosten at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/104575] New: noexcept operator rejects call to templated
 base class member function
Date: Wed, 16 Feb 2022 21:07:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104575

            Bug ID: 104575
           Summary: noexcept operator rejects call to templated base class
                    member function
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: oliver.rosten at googlemail dot com
  Target Milestone: ---

struct Y
{
    void swap(Y& rhs) noexcept {}
};

template<class B>
struct D : B
{
    void swap(D& rhs) noexcept (noexcept(B::swap(rhs))) {}
};

struct E : Y
{
    void swap(E& rhs) noexcept (noexcept(Y::swap(rhs))) {}
};

void foo()
{
    D<Y> x{}, y{};
    x.swap(y); // Rejected

    E u{}, v{};
    u.swap(v); // OK
}

-----------

error: cannot call member function 'void Y::swap(Y&)' without object

https://godbolt.org/z/E3P9MEd6z=