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This implements ranges::starts_with and ranges::ends_with from the C++23 paper P1659R3. The corresponding_S_impl member functions take optional optional size parameters __n1 and __n2 of the two ranges, where -1 means the corresponding size is not known. libstdc++-v3/ChangeLog: * include/bits/ranges_algo.h (__starts_with_fn, starts_with): Define. (__ends_with_fn, ends_with): Define. * include/bits/version.def (ranges_starts_ends_with): Define. * include/bits/version.h: Regenerate. * include/std/algorithm: Provide __cpp_lib_ranges_starts_ends_with. * src/c++23/std.cc.in (ranges::starts_with): Export. (ranges::ends_with): Export. * testsuite/25_algorithms/ends_with/1.cc: New test. * testsuite/25_algorithms/starts_with/1.cc: New test. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com> Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
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