[Bug c++/96877] New: Erroneous warning when default initializing function pointer types defined using std::declval
insertinterestingnamehere at gmail dot com
gcc-bugzilla@gcc.gnu.org
Tue Sep 1 02:07:17 GMT 2020
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96877
Bug ID: 96877
Summary: Erroneous warning when default initializing function
pointer types defined using std::declval
Product: gcc
Version: 10.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: insertinterestingnamehere at gmail dot com
Target Milestone: ---
When compiling the following with -Wextra (C++11 and later, all recent version
of gcc) the compiler emits an erroneous warning about binding a temporary in a
constructor. 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/sjKdP5.
#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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