2c7fb16b52
Since r11-1571 (c++: Refinements to "more constrained") was changed in the front end, the following comment from stl_iterator.h stopped being true: // These extra overloads are not needed in C++20, because the ones above // are constrained with a requires-clause and so overload resolution will // prefer them to greedy unconstrained function templates. The requires-clause is no longer considered when comparing unrelated function templates. That means that the constrained operator== specified in the standard is no longer more constrained than the pathological comparison operators defined in the testsuite_greedy_ops.h header. This was causing several tests to FAIL in C++20 mode: FAIL: 23_containers/deque/types/1.cc (test for excess errors) FAIL: 23_containers/vector/types/1.cc (test for excess errors) FAIL: 24_iterators/move_iterator/greedy_ops.cc (test for excess errors) FAIL: 24_iterators/normal_iterator/greedy_ops.cc (test for excess errors) FAIL: 24_iterators/reverse_iterator/greedy_ops.cc (test for excess errors) The solution is to restore some of the non-standard comparison operators that are more specialized than the greedy operators in the testsuite. libstdc++-v3/ChangeLog: * include/bits/stl_iterator.h (operator==, operator<=>): Define overloads for homogeneous specializations of reverse_iterator, __normal_iterator and move_iterator. |
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