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[69.118.112.187]) by smtp.gmail.com with ESMTPSA id t16-20020a05620a035000b0076cc4610d0asm8638118qkm.85.2023.12.18.15.06.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Dec 2023 15:06:35 -0800 (PST) From: Patrick Palka To: gcc-patches@gcc.gnu.org Cc: libstdc++@gcc.gnu.org, Patrick Palka Subject: [pushed] libstdc++: Make ranges::to closure objects SFINAE-friendly [PR112802] Date: Mon, 18 Dec 2023 18:06:31 -0500 Message-ID: <20231218230631.1779040-1-ppalka@redhat.com> X-Mailer: git-send-email 2.43.0.76.g1a87c842ec 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-default=true X-Spam-Status: No, score=-13.7 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_NONE,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: This also happens to fix composition of these closure objects. PR libstdc++/112802 PR libstdc++/113068 libstdc++-v3/ChangeLog: * include/std/ranges (__detail::_To::operator()): Add constraints. (__detail::_To2::operator()): Likewise. * testsuite/std/ranges/conv/1.cc (test_sfinae): New test. (test_composition): New test. --- libstdc++-v3/include/std/ranges | 4 ++++ libstdc++-v3/testsuite/std/ranges/conv/1.cc | 20 ++++++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges index be8475c0cb1..752a04e01bd 100644 --- a/libstdc++-v3/include/std/ranges +++ b/libstdc++-v3/include/std/ranges @@ -9389,6 +9389,8 @@ namespace __detail struct _To { template + requires requires { ranges::to<_Cont>(std::declval<_Range>(), + std::declval<_Args>()...); } constexpr auto operator()(_Range&& __r, _Args&&... __args) const { @@ -9431,6 +9433,8 @@ namespace __detail struct _To2 { template + requires requires { ranges::to<_Cont>(std::declval<_Range>(), + std::declval<_Args>()...); } constexpr auto operator()(_Range&& __r, _Args&&... __args) const { diff --git a/libstdc++-v3/testsuite/std/ranges/conv/1.cc b/libstdc++-v3/testsuite/std/ranges/conv/1.cc index 6d6a708ab64..09fd515edf1 100644 --- a/libstdc++-v3/testsuite/std/ranges/conv/1.cc +++ b/libstdc++-v3/testsuite/std/ranges/conv/1.cc @@ -448,6 +448,24 @@ test_constexpr() static_assert(x == 6); } +void +test_sfinae() +{ + // PR libstdc++/112802 + [](auto x) { + static_assert(!requires { std::ranges::to>()(x); }); + static_assert(!requires { std::ranges::to()(x); }); + }(0); +} + +void +test_composition() +{ + // PR libstdc++/113068 + auto adaptor = std::ranges::to() | std::ranges::to(); + auto str = adaptor(" "); +} + int main() { test_p1206r7_examples(); @@ -460,4 +478,6 @@ int main() test_lwg3984(); test_nodiscard(); test_constexpr(); + test_sfinae(); + test_composition(); } -- 2.43.0.76.g1a87c842ec