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[24.187.42.46]) by smtp.gmail.com with ESMTPSA id af79cd13be357-79bce89d660sm359709585a.9.2024.06.24.18.00.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Jun 2024 18:00:19 -0700 (PDT) From: Patrick Palka To: gcc-patches@gcc.gnu.org Cc: jason@redhat.com, Patrick Palka Subject: [PATCH] c++: decltype of by-ref capture proxy of ref [PR115504] Date: Mon, 24 Jun 2024 21:00:15 -0400 Message-ID: <20240625010015.122204-1-ppalka@redhat.com> X-Mailer: git-send-email 2.45.2.606.g9005149a4a 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=-13.4 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_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Bootstrapped and regtested on x86_64-pc-linux-gnu, does this look OK for trunk/14? -- >8 -- The capture proxy handling in finish_decltype_type added in r14-5330 was stripping the reference type of a capture proxy's captured variable, which is desirable for a by-value capture, but not for a by-ref capture (of a reference). PR c++/115504 gcc/cp/ChangeLog: * semantics.cc (finish_decltype_type): For a by-reference capture proxy, don't strip the reference type (if any) of the captured variable. gcc/testsuite/ChangeLog: * g++.dg/cpp1y/decltype-auto8.C: New test. --- gcc/cp/semantics.cc | 4 +++- gcc/testsuite/g++.dg/cpp1y/decltype-auto8.C | 11 +++++++++++ 2 files changed, 14 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/g++.dg/cpp1y/decltype-auto8.C diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc index 08f5f245e7d..b4f626924af 100644 --- a/gcc/cp/semantics.cc +++ b/gcc/cp/semantics.cc @@ -12076,9 +12076,11 @@ finish_decltype_type (tree expr, bool id_expression_or_member_access_p, { if (is_normal_capture_proxy (expr)) { + bool by_ref = TYPE_REF_P (TREE_TYPE (expr)); expr = DECL_CAPTURED_VARIABLE (expr); type = TREE_TYPE (expr); - type = non_reference (type); + if (!by_ref) + type = non_reference (type); } else { diff --git a/gcc/testsuite/g++.dg/cpp1y/decltype-auto8.C b/gcc/testsuite/g++.dg/cpp1y/decltype-auto8.C new file mode 100644 index 00000000000..9a5e435f14f --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/decltype-auto8.C @@ -0,0 +1,11 @@ +// PR c++/115504 +// { dg-do compile { target c++14 } } + +void f(int& x) { + [&x]() { + decltype(auto) a = x; + using type = decltype(x); + using type = decltype(a); + using type = int&; // not 'int' + }; +} -- 2.45.2.606.g9005149a4a