b8018e5c5e
This implements the resolution I'm proposing for LWG 3545, to avoid hard errors when using std::to_address for types that make pointer_traits ill-formed. Consistent with std::iterator_traits, instantiating std::pointer_traits for a non-pointer type will be well-formed, but give an empty type with no member types. This avoids the problematic cases for std::to_address. Additionally, the pointer_to member is now only declared when the element type is not cv void (and for C++20, when the function body would be well-formed). The rebind member was already SFINAE-friendly in our implementation. libstdc++-v3/ChangeLog: PR libstdc++/96416 * include/bits/ptr_traits.h (pointer_traits): Reimplement to be SFINAE-friendly (LWG 3545). * testsuite/20_util/pointer_traits/lwg3545.cc: New test. * testsuite/20_util/to_address/1_neg.cc: Adjust dg-error line. * testsuite/20_util/to_address/lwg3545.cc: New test. |
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| .dir-locals.el | ||
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| COPYING3.LIB | ||
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| libtool-ldflags | ||
| libtool.m4 | ||
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