From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id E30C43948A5F for ; Fri, 6 May 2022 22:57:09 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org E30C43948A5F Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-158-hlRJ7MFdNlOgxgMU9tDEgA-1; Fri, 06 May 2022 18:57:01 -0400 X-MC-Unique: hlRJ7MFdNlOgxgMU9tDEgA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A245B800B21; Fri, 6 May 2022 22:57:00 +0000 (UTC) Received: from localhost (unknown [10.33.36.192]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6BEDB111E3E9; Fri, 6 May 2022 22:57:00 +0000 (UTC) From: Jonathan Wakely To: libstdc++@gcc.gnu.org, gcc-patches@gcc.gnu.org Subject: [committed 1/2] libstdc++: Fix deserialization for std::normal_distribution [PR105502] Date: Fri, 6 May 2022 23:56:58 +0100 Message-Id: <20220506225659.3368784-1-jwakely@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-12.4 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_LOW, SPF_HELO_NONE, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE 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: Fri, 06 May 2022 22:57:11 -0000 Tested powerpc64le-linux, pushed to trunk. Backports to all branches needed. -- >8 -- This fixes a regression in std::normal_distribution deserialization that caused the object to be left unchanged if the __state_avail value read from the stream was false. libstdc++-v3/ChangeLog: PR libstdc++/105502 * include/bits/random.tcc (operator>>(basic_istream&, normal_distribution&)): Update state when __state_avail is false. * testsuite/26_numerics/random/normal_distribution/operators/serialize.cc: Check that deserialized object equals serialized one. --- libstdc++-v3/include/bits/random.tcc | 2 +- .../operators/serialize.cc | 36 ++++++++++++++++++- 2 files changed, 36 insertions(+), 2 deletions(-) diff --git a/libstdc++-v3/include/bits/random.tcc b/libstdc++-v3/include/bits/random.tcc index 6c72e991007..87a16a21336 100644 --- a/libstdc++-v3/include/bits/random.tcc +++ b/libstdc++-v3/include/bits/random.tcc @@ -1961,7 +1961,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION bool __saved_avail; if (__is >> __mean >> __stddev >> __saved_avail) { - if (__saved_avail && (__is >> __x._M_saved)) + if (!__saved_avail || (__is >> __x._M_saved)) { __x._M_saved_available = __saved_avail; __x.param(param_type(__mean, __stddev)); diff --git a/libstdc++-v3/testsuite/26_numerics/random/normal_distribution/operators/serialize.cc b/libstdc++-v3/testsuite/26_numerics/random/normal_distribution/operators/serialize.cc index 9d8f8278fb3..d4f9f374643 100644 --- a/libstdc++-v3/testsuite/26_numerics/random/normal_distribution/operators/serialize.cc +++ b/libstdc++-v3/testsuite/26_numerics/random/normal_distribution/operators/serialize.cc @@ -25,6 +25,7 @@ #include #include +#include void test01() @@ -37,10 +38,43 @@ test01() str << u; str >> v; + VERIFY( u == v ); +} + +void +test_pr105502() +{ + // PR libstdc++/105502 std::normal_distribution deserialization issue + std::stringstream str; + std::normal_distribution<> d{1, 2}, d2; + std::minstd_rand0 g; + str << d; + VERIFY( str ); + str >> d2; + VERIFY( str ); + VERIFY( d == d2 ); + + (void) d(g); // sets d._M_saved_available = true + str.str(""); + str.clear(); + str << d; + VERIFY( str ); + str >> d2; + VERIFY( str ); + VERIFY( d == d2 ); + + (void) d(g); // sets d._M_saved_available = false + str.str(""); + str.clear(); + str << d; + VERIFY( str ); + str >> d2; + VERIFY( str ); + VERIFY( d == d2 ); } int main() { test01(); - return 0; + test_pr105502(); } -- 2.34.1