| // { dg-do run { target c++11 } } |
| |
| // Copyright (C) 2008-2021 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/>. |
| |
| // 20.8.13.4 Template class owner_less [util.smartptr.ownerless] |
| |
| #include <memory> |
| #include <algorithm> |
| #include <testsuite_hooks.h> |
| |
| struct A { }; |
| |
| struct B { A a[2]; }; |
| |
| // 20.8.13.4 Template class owner_less [util.smartptr.ownerless] |
| |
| int |
| test01() |
| { |
| // test empty shared_ptrs compare equivalent |
| std::owner_less<std::shared_ptr<A>> less; |
| std::owner_less<std::weak_ptr<A>> wless; |
| std::shared_ptr<A> p1; |
| std::shared_ptr<A> p2; |
| VERIFY( !less(p1, p2) && !less(p2, p1) ); |
| std::weak_ptr<A> p3; |
| VERIFY( !less(p1, p3) && !less(p3, p1) ); |
| VERIFY( !wless(p1, p3) && !wless(p3, p1) ); |
| return 0; |
| } |
| |
| |
| // Construction from pointer |
| int |
| test02() |
| { |
| std::owner_less<std::shared_ptr<A>> less; |
| std::owner_less<std::weak_ptr<A>> wless; |
| |
| std::shared_ptr<A> empty; |
| |
| std::shared_ptr<A> a1(new A); |
| VERIFY( less(empty, a1) || less(a1, empty) ); |
| |
| std::shared_ptr<A> a2(new A); |
| VERIFY( less(a1, a2) || less(a2, a1) ); |
| |
| std::weak_ptr<A> w1(a1); |
| VERIFY( !less(a1, w1) && !less(w1, a1) ); |
| |
| std::weak_ptr<A> w2(a2); |
| VERIFY( wless(w1, w2) || wless(w2, w1) ); |
| |
| a1.reset(); |
| VERIFY( !less(empty, a1) && !less(a1, empty) ); |
| VERIFY( less(a1, w1) || less(w1, a1) ); |
| |
| a2.reset(); |
| VERIFY( !less(a2, a1) && !less(a1, a2) ); |
| |
| return 0; |
| } |
| |
| // aliasing |
| int |
| test03() |
| { |
| std::owner_less<std::shared_ptr<A>> less; |
| std::owner_less<std::weak_ptr<A>> wless; |
| |
| std::shared_ptr<B> b(new B); |
| std::shared_ptr<A> a0(b, &b->a[0]); |
| std::shared_ptr<A> a1(b, &b->a[1]); |
| // values are different but owners are equivalent: |
| VERIFY( a0 < a1 && !less(a0, a1) && !less(a1, a0) ); |
| |
| std::weak_ptr<A> w0(a0); |
| std::weak_ptr<A> w1(a1); |
| VERIFY( !wless(w0, w1) && !wless(w1, w0) ); |
| VERIFY( !less(a0, w1) && !less(w1, a0) ); |
| VERIFY( !wless(w0, a1) && !wless(a1, w0) ); |
| |
| return 0; |
| } |
| |
| // strict weak ordering |
| int |
| test04() |
| { |
| std::owner_less<std::shared_ptr<A>> less; |
| |
| std::shared_ptr<A> a[3]; |
| a[0].reset(new A); |
| a[1].reset(new A); |
| a[2].reset(new A); |
| std::sort(a, a+3, less); |
| VERIFY( !less(a[0], a[0]) ); |
| VERIFY( less(a[0], a[1]) && !less(a[1], a[0]) ); |
| VERIFY( less(a[0], a[1]) && less(a[1], a[2]) && less(a[0], a[2]) ); |
| |
| return 0; |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| test02(); |
| test03(); |
| test04(); |
| return 0; |
| } |