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[69.125.73.58]) by smtp.gmail.com with ESMTPSA id t190sm7977867qkb.1.2021.10.19.05.17.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Oct 2021 05:17:45 -0700 (PDT) From: Patrick Palka To: gcc-patches@gcc.gnu.org Cc: libstdc++@gcc.gnu.org, Patrick Palka Subject: [PATCH 1/2] libstdc++: Implement LWG 3523 changes to ranges::iota_view Date: Tue, 19 Oct 2021 08:17:03 -0400 Message-Id: <20211019121704.1510908-1-ppalka@redhat.com> X-Mailer: git-send-email 2.33.1.637.gf443b226ca MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" X-Spam-Status: No, score=-15.7 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libstdc++@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libstdc++ mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 Oct 2021 12:17:49 -0000 libstdc++-v3/ChangeLog: * include/std/ranges (iota_view::_Iterator): Befriend iota_view. (iota_view::_Sentinel): Likewise. (iota_view::iota_view): Add three overloads each taking an iterator/sentinel pair as per LWG 3523. * testsuite/std/ranges/iota/iota_view.cc (test06): New test. --- libstdc++-v3/include/std/ranges | 21 +++++++++++++++++++ .../testsuite/std/ranges/iota/iota_view.cc | 21 +++++++++++++++++++ 2 files changed, 42 insertions(+) diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges index b8de400dfbb..85f232d8fb9 100644 --- a/libstdc++-v3/include/std/ranges +++ b/libstdc++-v3/include/std/ranges @@ -532,6 +532,7 @@ namespace ranges private: _Winc _M_value = _Winc(); + friend iota_view; friend _Sentinel; }; @@ -568,6 +569,8 @@ namespace ranges operator-(const _Sentinel& __x, const _Iterator& __y) requires sized_sentinel_for<_Bound, _Winc> { return __x._M_distance_from(__y); } + + friend iota_view; }; _Winc _M_value = _Winc(); @@ -590,6 +593,24 @@ namespace ranges __glibcxx_assert( bool(__value <= __bound) ); } + constexpr + iota_view(_Iterator __first, _Iterator __last) + requires same_as<_Winc, _Bound> + : iota_view(__first._M_value, __last._M_value) + { } + + constexpr + iota_view(_Iterator __first, unreachable_sentinel_t __last) + requires same_as<_Bound, unreachable_sentinel_t> + : iota_view(__first._M_value, __last) + { } + + constexpr + iota_view(_Iterator __first, _Sentinel __last) + requires (!same_as<_Winc, _Bound>) && (!same_as<_Bound, unreachable_sentinel_t>) + : iota_view(__first._M_value, __last._M_bound) + { } + constexpr _Iterator begin() const { return _Iterator{_M_value}; } diff --git a/libstdc++-v3/testsuite/std/ranges/iota/iota_view.cc b/libstdc++-v3/testsuite/std/ranges/iota/iota_view.cc index 362ef1f7f78..5bebe4be693 100644 --- a/libstdc++-v3/testsuite/std/ranges/iota/iota_view.cc +++ b/libstdc++-v3/testsuite/std/ranges/iota/iota_view.cc @@ -18,6 +18,7 @@ // { dg-options "-std=gnu++2a" } // { dg-do run { target c++2a } } +#include #include #include @@ -90,6 +91,25 @@ test05() VERIFY( r.begin() - r.end() == -3 ); } +void +test06() +{ + // Verify LWG 3523 changes. + auto v1 = std::views::iota(0, 5); + auto w1 = decltype(v1)(v1.begin(), v1.end()); + VERIFY( std::ranges::equal(v1, w1) ); + + auto v2 = std::views::iota(0); + auto w2 = decltype(v2)(v2.begin(), v2.end()); + static_assert(std::same_as); + VERIFY( *w2.begin() == 0 ); + + auto v3 = std::views::iota(0, 5l); + auto w3 = decltype(v3)(v3.begin(), v3.end()); + static_assert(!std::ranges::common_range); + VERIFY( std::ranges::equal(v3, w3) ); +} + int main() { @@ -98,4 +118,5 @@ main() test03(); test04(); test05(); + test06(); } -- 2.33.1.637.gf443b226ca