https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94924
Bug ID: 94924
Summary: Default equality operator for C-array compares
addresses, not data
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rhalbersma at gmail dot com
Target Milestone: ---
It appears that the default op== for a C-array has array-to-pointer decay
applied and does not compare the underlying array data.
struct S {
int data[1];
bool operator==(const S&) const = default;
};
int main()
{
static_assert(S{1} != S{1});
constexpr auto s = S{1};
static_assert(s == s);
}
Tested on tip-of-trunk at Wandbox:
https://wandbox.org/permlink/YxUv5dFs7mSGlNBx
Works correctly on Clang >= 10.
