https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103185
Bug ID: 103185
Summary: ind[arr] is rejected when arr is an array prvalue
Product: gcc
Version: 10.1.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: de34 at live dot cn
Target Milestone: ---
With gcc 10 and later versions, the following program compiles in C++11/14
modes, but fails to compile in C++17 and later modes.
#include <type_traits>
int main()
{
using intarr = int[];
static_assert(std::is_same<decltype(0[intarr{0}]), int&&>::value, "");
}
It seems that arr[ind]("intarr{0}[0]") doesn't suffer from this bug.
Gcc 9 correctly accepted this code.
wandbox links:
gcc 12.0 (-std=c++17): https://wandbox.org/permlink/AQGr8pUXHQkPrJ9m
gcc 12.0 (-std=c++14): https://wandbox.org/permlink/aYpBwLVK8tsDHTl3
gcc 10.1 (-std=c++17): https://wandbox.org/permlink/nnWuZAawBZnrmHvN
gcc 10.1 (-std=c++14): https://wandbox.org/permlink/4fNJLiqU5VaMZPfm
gcc 9.3 (-std=c++17): https://wandbox.org/permlink/vugrP8zIzBSPiVup
Perhaps this bug is related to bug 94264 and bug 103183.
