{"id":2226790,"url":"http://patchwork.ozlabs.org/api/patches/2226790/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/patch/bmm.hhupath8dc.gcc.gcc-TEST.tkaminsk.107.1.8@forge-stage.sourceware.org/","project":{"id":17,"url":"http://patchwork.ozlabs.org/api/projects/17/?format=json","name":"GNU Compiler Collection","link_name":"gcc","list_id":"gcc-patches.gcc.gnu.org","list_email":"gcc-patches@gcc.gnu.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"","list_archive_url":null,"date":"2026-04-22T18:55:24","name":"[v1,08/13] Addd test for monadic interface","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"c0da7e24fee42997b4a7a765331f70581b8736ba","submitter":{"id":93223,"url":"http://patchwork.ozlabs.org/api/people/93223/?format=json","name":"tkaminsk via Sourceware Forge","email":"forge-bot+tkaminsk@forge-stage.sourceware.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/gcc/patch/bmm.hhupath8dc.gcc.gcc-TEST.tkaminsk.107.1.8@forge-stage.sourceware.org/mbox/","series":[{"id":501097,"url":"http://patchwork.ozlabs.org/api/series/501097/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=501097","date":"2026-04-22T18:55:20","name":"libstdc++: optional (P2988R12)","version":1,"mbox":"http://patchwork.ozlabs.org/series/501097/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2226790/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2226790/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; helo=vm01.sourceware.org;\n envelope-from=gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org;\n receiver=patchwork.ozlabs.org)","sourceware.org; dmarc=none (p=none dis=none)\n header.from=forge-stage.sourceware.org","sourceware.org;\n spf=pass smtp.mailfrom=forge-stage.sourceware.org","server2.sourceware.org;\n arc=none smtp.remote-ip=38.145.34.39"],"Received":["from vm01.sourceware.org (vm01.sourceware.org\n [IPv6:2620:52:6:3111::32])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g193l0fp7z1yGs\n\tfor ; Thu, 23 Apr 2026 05:57:07 +1000 (AEST)","from vm01.sourceware.org (localhost [127.0.0.1])\n\tby sourceware.org (Postfix) with ESMTP id F36F94311B5E\n\tfor ; Wed, 22 Apr 2026 19:56:59 +0000 (GMT)","from forge-stage.sourceware.org (vm08.sourceware.org [38.145.34.39])\n by sourceware.org (Postfix) with ESMTPS id B44B240986D6\n for ; Wed, 22 Apr 2026 18:56:25 +0000 (GMT)","from forge-stage.sourceware.org (localhost [IPv6:::1])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange x25519 server-signature ECDSA (prime256v1) server-digest SHA256)\n (No client certificate requested)\n by forge-stage.sourceware.org (Postfix) with ESMTPS id 59E33435B9\n for ; Wed, 22 Apr 2026 18:56:23 +0000 (UTC)"],"DKIM-Filter":["OpenDKIM Filter v2.11.0 sourceware.org F36F94311B5E","OpenDKIM Filter v2.11.0 sourceware.org B44B240986D6"],"DMARC-Filter":"OpenDMARC Filter v1.4.2 sourceware.org B44B240986D6","ARC-Filter":"OpenARC Filter v1.0.0 sourceware.org B44B240986D6","ARC-Seal":"i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1776884185; cv=none;\n b=VwjzA8q9uuPro8krY2QLCC5WdQlLraIZUF+obzYNVVfkiL+IwgRnRcnYnLXLQnmSNtw44Wo0hAa645mVOjd82XveGsnNrDfVStGGvCoPeervimaguxehNcYt5Y29fs8GDh/HdvepcUq6PrWhUb5xvUfrhZejUmXBVljhjMAmRbk=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=sourceware.org; s=key;\n t=1776884185; c=relaxed/simple;\n bh=Lbp00CqM7DlZqV+fUt396lqLuL19kOkcA1lOtXbzodA=;\n h=From:Date:Subject:MIME-Version:To:Message-ID;\n b=DTeI3ka8wwNlVBVNek69zalznMLEcSjPS7keqy1d+jDUEEBIAwUq/ClzfJldcmzglJNfz2DCFzeWjknCMyoJ0UmTAfyRGbqr4bH6iu7gUHYJ2TqgS01NpIlcU5xWux43SpFS8cKyeV0MecD0XFVUN/iwGDWAIyqTrr7nhoifgy0=","ARC-Authentication-Results":"i=1; server2.sourceware.org","From":"tkaminsk via Sourceware Forge\n ","Date":"Wed, 22 Apr 2026 18:55:24 +0000","Subject":"[PATCH v1 08/13] Addd test for monadic interface","MIME-Version":"1.0","Content-Type":"text/plain; charset=UTF-8","Content-Transfer-Encoding":"8bit","To":"gcc-patches mailing list ","Message-ID":"\n ","X-Mailer":"batrachomyomachia","X-Pull-Request-Organization":"gcc","X-Pull-Request-Repository":"gcc-TEST","X-Pull-Request":"https://forge.sourceware.org/gcc/gcc-TEST/pulls/107","References":"\n ","In-Reply-To":"\n ","X-Patch-URL":"\n https://forge.sourceware.org/tkaminsk/gcc/commit/44273a68e00f00a00fa23062aa76d281816af035","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Reply-To":"gcc-patches mailing list ,\n tkaminsk@gcc.gnu.org","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"},"content":"From: Tomasz Kamiński \n\n---\n .../20_util/optional/monadic/ref_neg.cc | 20 ++\n .../testsuite/20_util/optional/ref/monadic.cc | 192 ++++++++++++++++++\n 2 files changed, 212 insertions(+)\n create mode 100644 libstdc++-v3/testsuite/20_util/optional/monadic/ref_neg.cc\n create mode 100644 libstdc++-v3/testsuite/20_util/optional/ref/monadic.cc","diff":"diff --git a/libstdc++-v3/testsuite/20_util/optional/monadic/ref_neg.cc b/libstdc++-v3/testsuite/20_util/optional/monadic/ref_neg.cc\nnew file mode 100644\nindex 000000000000..ed1b42b1992d\n--- /dev/null\n+++ b/libstdc++-v3/testsuite/20_util/optional/monadic/ref_neg.cc\n@@ -0,0 +1,20 @@\n+// { dg-do compile { target c++23 } }\n+\n+#include \n+\n+struct S { int x; int y; };\n+\n+void test()\n+{\n+ std::optional o;\n+ const std::optional& co = o;\n+\n+ o.transform(&S::x); // { dg-error \"from here\" \"optional\" { target c++23_down } }\n+ co.transform(&S::x); // { dg-error \"from here\" \"optional\" { target c++23_down } }\n+ std::move(o).transform(&S::x); // { dg-error \"from here\" \"optional\" }\n+ std::move(co).transform(&S::x); // { dg-error \"from here\" \"optional\" }\n+}\n+\n+// { dg-prune-output \"in a union may not have reference type\" }\n+// { dg-prune-output \"static assertion failed\" }\n+// { dg-prune-output \"forming pointer to reference type\" }\ndiff --git a/libstdc++-v3/testsuite/20_util/optional/ref/monadic.cc b/libstdc++-v3/testsuite/20_util/optional/ref/monadic.cc\nnew file mode 100644\nindex 000000000000..e8460c6528bd\n--- /dev/null\n+++ b/libstdc++-v3/testsuite/20_util/optional/ref/monadic.cc\n@@ -0,0 +1,192 @@\n+// { dg-do run { target c++26 } }\n+\n+#include \n+#include \n+#include \n+#include \n+\n+struct NonMovable\n+{\n+ constexpr NonMovable() {}\n+ NonMovable(NonMovable&&) = delete;\n+};\n+\n+struct Tracker\n+{\n+ int copy = 0;\n+ int move = 0;\n+\n+ Tracker() = default;\n+\n+ constexpr Tracker(Tracker const& o)\n+ : copy(o.copy+1), move(o.move)\n+ {}\n+\n+ constexpr Tracker(Tracker&& o)\n+ : copy(o.copy), move(o.move+1)\n+ {}\n+\n+ Tracker& operator=(Tracker) = delete;\n+\n+ void reset() {\n+ copy = move = 0;\n+ }\n+};\n+\n+template\n+auto identity_of = [](U&& t) -> std::optional\n+{\n+ static_assert( std::is_same_v );\n+ VERIFY( t.copy == 0 );\n+ VERIFY( t.move == 0 );\n+ return std::optional(t);\n+};\n+\n+constexpr void\n+test_and_then()\n+{\n+ std::optional t(std::in_place);\n+ std::optional rt(t);\n+ std::optional rct(t);\n+\n+ auto r1 = t.and_then(identity_of);\n+ VERIFY( r1.has_value() );\n+ VERIFY( &r1.value() == &t.value() );\n+\n+ auto r2 = rt.and_then(identity_of);\n+ VERIFY( r2.has_value() );\n+ VERIFY( &r2.value() == &t.value() );\n+\n+ std::as_const(rt).and_then(identity_of);\n+ std::move(rt).and_then(identity_of);\n+\n+ auto r4 = rct.and_then(identity_of);\n+ VERIFY( r4.has_value() );\n+ VERIFY( &r4.value() == &t.value() );\n+\n+ std::as_const(rct).and_then(identity_of);\n+ std::move(rct).and_then(identity_of);\n+\n+ auto r5 = rt.and_then([](Tracker&) { return std::optional(42); });\n+ static_assert( std::is_same_v> );\n+ VERIFY( r5.has_value() );\n+ VERIFY( r5.value() == 42 );\n+\n+ auto r6 = rct.and_then([](const Tracker&) { return std::optional(); });\n+ static_assert( std::is_same_v> );\n+ VERIFY( !r6.has_value() );\n+\n+ rct.reset();\n+ auto r7 = rct.and_then([](const Tracker&) { VERIFY(false); return std::optional(42); });\n+ static_assert( std::is_same_v> );\n+ VERIFY( !r7.has_value() );\n+\n+ rt.reset();\n+ auto r8 = rt.and_then([](Tracker&) { VERIFY(false); return std::optional(); });\n+ static_assert( std::is_same_v> );\n+ VERIFY( !r8.has_value() );\n+}\n+\n+template\n+constexpr void\n+test_or_else()\n+{\n+ T t, u;\n+\n+ std::optional ot(t);\n+ auto r1 = ot.or_else([&] { VERIFY(false); return std::optional(u); });\n+ VERIFY( &ot.value() == &t );\n+ VERIFY( r1.has_value() );\n+ VERIFY( &r1.value() == &t );\n+ auto r2 = std::move(ot).or_else([&] { VERIFY(false); return std::optional(); });\n+ VERIFY( &ot.value() == &t );\n+ VERIFY( r2.has_value() );\n+ VERIFY( &r2.value() == &t );\n+\n+ ot.reset();\n+ auto r3 = ot.or_else([&] { return std::optional(u); });\n+ VERIFY( !ot.has_value() );\n+ VERIFY( r3.has_value() );\n+ VERIFY( &r3.value() == &u );\n+ auto r4 = std::move(ot).or_else([] { return std::optional(); });\n+ VERIFY( !ot.has_value() );\n+ VERIFY( !r4.has_value() );\n+}\n+\n+constexpr void\n+test_transform()\n+{\n+ std::optional t(std::in_place);\n+\n+ auto r1 = t.transform(&Tracker::copy);\n+ static_assert( std::is_same_v> );\n+ VERIFY( r1.has_value() );\n+ VERIFY( &r1.value() == &t->copy );\n+ auto r2 = std::as_const(t).transform(&Tracker::move);\n+ static_assert( std::is_same_v> );\n+ VERIFY( r2.has_value() );\n+ VERIFY( &r2.value() == &t->move );\n+\n+ std::optional rt(t);\n+ auto r3 = rt.transform(&Tracker::copy);\n+ static_assert( std::is_same_v> );\n+ VERIFY( r3.has_value() );\n+ VERIFY( &r3.value() == &t->copy );\n+ auto r4 = std::as_const(rt).transform(&Tracker::copy);\n+ static_assert( std::is_same_v> );\n+ VERIFY( r4.has_value() );\n+ VERIFY( &r4.value() == &t->copy );\n+ auto r5 = std::move(rt).transform(&Tracker::copy);\n+ static_assert( std::is_same_v> );\n+ VERIFY( r5.has_value() );\n+ VERIFY( &r5.value() == &t->copy );\n+\n+ auto r6 = rt.transform([] (Tracker& t) { return 10; });\n+ static_assert( std::is_same_v> );\n+ VERIFY( r6.has_value() );\n+ VERIFY( &r6.value() != &t->copy );\n+ VERIFY( r6.value() == 10 );\n+\n+ auto r7 = rt.transform([] (Tracker& t) { return NonMovable(); });\n+ static_assert( std::is_same_v> );\n+ VERIFY( r7.has_value() );\n+\n+ rt.reset();\n+ auto r8 = rt.transform([] (Tracker& t) { VERIFY(false); return 42; });\n+ static_assert( std::is_same_v> );\n+ VERIFY( !r8.has_value() );\n+\n+ std::optional crt(t);\n+ auto r9 = crt.transform(&Tracker::copy);\n+ static_assert( std::is_same_v> );\n+ VERIFY( r9.has_value() );\n+ VERIFY( &r9.value() == &t->copy );\n+ auto r10 = std::as_const(crt).transform(&Tracker::copy);\n+ static_assert( std::is_same_v> );\n+ VERIFY( r10.has_value() );\n+ VERIFY( &r10.value() == &t->copy );\n+ auto r11 = std::move(crt).transform(&Tracker::copy);\n+ static_assert( std::is_same_v> );\n+ VERIFY( r11.has_value() );\n+ VERIFY( &r11.value() == &t->copy );\n+\n+ crt.reset();\n+ auto r12 = rt.transform([] (Tracker& t) { VERIFY(false); return 42; });\n+ static_assert( std::is_same_v> );\n+ VERIFY( !r12.has_value() );\n+}\n+\n+int main()\n+{\n+ auto test_all = [] {\n+ test_and_then();\n+ test_transform();\n+ test_or_else();\n+ test_or_else();\n+ test_or_else();\n+ return true;\n+ };\n+\n+ test_all();\n+ static_assert(test_all());\n+}\n","prefixes":["v1","08/13"]}