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From: Giuliano Belinassi <giulianob@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc/devel/autopar_devel] libstdc++: Add new testcase for comparison category types Date: Sat, 22 Aug 2020 21:37:56 +0000 (GMT) [thread overview] Message-ID: <20200822213756.8A3A9385DC37@sourceware.org> (raw) https://gcc.gnu.org/g:9196de6c3b5b6392340cccb42f28e27eb1ec5942 commit 9196de6c3b5b6392340cccb42f28e27eb1ec5942 Author: Jonathan Wakely <jwakely@redhat.com> Date: Wed May 27 13:13:19 2020 +0100 libstdc++: Add new testcase for comparison category types Comparing a comparison category type to anything except a literal 0 is undefined. This verifies that at least some misuses are diagnosed at compile time. * testsuite/18_support/comparisons/categories/zero_neg.cc: New test. Diff: --- .../18_support/comparisons/categories/zero_neg.cc | 46 ++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/libstdc++-v3/testsuite/18_support/comparisons/categories/zero_neg.cc b/libstdc++-v3/testsuite/18_support/comparisons/categories/zero_neg.cc new file mode 100644 index 00000000000..0a8af41acb9 --- /dev/null +++ b/libstdc++-v3/testsuite/18_support/comparisons/categories/zero_neg.cc @@ -0,0 +1,46 @@ +// Copyright (C) 2020 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the +// terms of the GNU General Public License as published by the +// Free Software Foundation; either version 3, or (at your option) +// any later version. + +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING3. If not see +// <http://www.gnu.org/licenses/>. + +// { dg-options "-std=gnu++2a" } +// { dg-do compile { target c++2a } } + +#include <compare> + +// C++20 [cmp.categories.pre] +// "an argument other than a literal 0 is undefined" + +void +test01() +{ + std::partial_ordering::equivalent == 0; // OK + std::weak_ordering::equivalent == 0; // OK + std::strong_ordering::equivalent == 0; // OK + + std::partial_ordering::equivalent == 1; // { dg-error "invalid conversion" } + std::weak_ordering::equivalent == 1; // { dg-error "invalid conversion" } + std::strong_ordering::equivalent == 1; // { dg-error "invalid conversion" } + + constexpr void* p = nullptr; + std::partial_ordering::equivalent == p; // { dg-error "invalid conversion" } + std::weak_ordering::equivalent == p; // { dg-error "invalid conversion" } + std::strong_ordering::equivalent == p; // { dg-error "invalid conversion" } + + // Ideally these would be ill-formed, but the current code accepts it. + std::partial_ordering::equivalent == nullptr; + std::weak_ordering::equivalent == nullptr; + std::strong_ordering::equivalent == nullptr; +}
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