https://bugs.llvm.org/show_bug.cgi?id=41991
Bug ID: 41991
Summary: c++2a: unable to set attributes to defaulted member
functions
Product: clang
Version: 8.0
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++2a
Assignee: unassignedclangb...@nondot.org
Reporter: developm...@jordi.vilar.cat
CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk
The following code, compiled with clang-8 -std=c++2a, fails with:
error: an attribute list cannot appear here
(it also issues error: only special member functions may be defaulted, but this
is reported in a separated bug report #41989)
#include <compare>
struct type
{
// original
[[nodiscard]] friend constexpr std::strong_equality operator<=>(const
type&, const type&) noexcept = default;
// variant #1
// [[nodiscard]] friend constexpr std::strong_equality operator<=>(const
type&, const type&) noexcept;
// variant #2
// [[nodiscard]] friend constexpr std::strong_equality operator<=>(const
type&, const type&) noexcept { return std::strong_ordering::equal; }
};
With variant #1, clang complaints with the same error, this time is correct as
attribues for friend declarations are not allowed as per specs.
With variant #2, clang accepts the code with no complaints as the friend
operator is now a definition and attributes are allowed in this case.
With the original variant, clang applies the rule for friend declaration when
in fact it is a (implicit) definition, that is, the friend operator is not
expected to be later defined.
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