[llvm-bugs] [Bug 47377] New: Function pointer types defined using std::declval cannot be default initialized in a struct
via llvm-bugs
llvm-bugs at lists.llvm.org
Mon Aug 31 18:51:08 PDT 2020
https://bugs.llvm.org/show_bug.cgi?id=47377
Bug ID: 47377
Summary: Function pointer types defined using std::declval
cannot be default initialized in a struct
Product: clang
Version: 10.0
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: unassignedclangbugs at nondot.org
Reporter: insertinterestingnamehere at gmail.com
CC: blitzrakete at gmail.com, dgregor at apple.com,
erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
richard-llvm at metafoo.co.uk
The following should compile fine, but errors out with versions more recent
than 6. Versions 3.4 through 6 emit an erroneous diagnostic. Note: this works
fine if function_type is declared as a plain typedef instead of using decltype
and std::declval. See https://godbolt.org/z/YKET67.
#include <utility>
using function_type = decltype(std::declval<void (*)(void*) noexcept>());
struct S {
function_type fptr = nullptr;
};
int main() {
S thing;
}
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