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The memmove optimizations for std::uninitialized_copy/fill/_n will compile even if the type is not copy constructible, because std::copy doesn't require copy construction to work. But the uninitialized algorithms do require it. This adds explicit static assertions to ensure we don't allow ill-formed initializations. PR libstdc++/89164 * include/bits/stl_algobase.h (__copy_move): Give descriptive names to template parameters. * include/bits/stl_uninitialized.h (uninitialized_copy) (uninitialized_fill, uninitialized_fill_n): Add static assertions to diagnose invalid uses. * testsuite/20_util/specialized_algorithms/uninitialized_copy/1.cc: Adjust expected error. * testsuite/20_util/specialized_algorithms/uninitialized_copy/89164.cc: New test. * testsuite/20_util/specialized_algorithms/uninitialized_copy_n/ 89164.cc: New test. * testsuite/20_util/specialized_algorithms/uninitialized_fill/89164.cc: New test. * testsuite/20_util/specialized_algorithms/uninitialized_fill_n/ 89164.cc: New test. * testsuite/23_containers/vector/cons/89164.cc: New test. * testsuite/23_containers/vector/cons/89164_c++17.cc: New test. This is the patch sent in https://gcc.gnu.org/ml/libstdc++/2019-02/msg00034.html but with the dg-error directives in the tests fixed. Tested x86_64-linux, committed to trunk.
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