b64f8b07c1
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@119395 91177308-0d34-0410-b5e6-96231b3b80d8
75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <memory>
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// template <class T> struct owner_less;
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//
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// template <class T>
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// struct owner_less<shared_ptr<T> >
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// : binary_function<shared_ptr<T>, shared_ptr<T>, bool>
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// {
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// typedef bool result_type;
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// bool operator()(shared_ptr<T> const&, shared_ptr<T> const&) const;
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// bool operator()(shared_ptr<T> const&, weak_ptr<T> const&) const;
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// bool operator()(weak_ptr<T> const&, shared_ptr<T> const&) const;
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// };
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//
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// template <class T>
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// struct owner_less<weak_ptr<T> >
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// : binary_function<weak_ptr<T>, weak_ptr<T>, bool>
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// {
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// typedef bool result_type;
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// bool operator()(weak_ptr<T> const&, weak_ptr<T> const&) const;
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// bool operator()(shared_ptr<T> const&, weak_ptr<T> const&) const;
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// bool operator()(weak_ptr<T> const&, shared_ptr<T> const&) const;
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// };
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#include <memory>
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#include <cassert>
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int main()
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{
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const std::shared_ptr<int> p1(new int);
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const std::shared_ptr<int> p2 = p1;
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const std::shared_ptr<int> p3(new int);
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const std::weak_ptr<int> w1(p1);
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const std::weak_ptr<int> w2(p2);
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const std::weak_ptr<int> w3(p3);
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{
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typedef std::owner_less<std::shared_ptr<int> > CS;
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CS cs;
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assert(!cs(p1, p2));
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assert(!cs(p2, p1));
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assert(cs(p1 ,p3) || cs(p3, p1));
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assert(cs(p3, p1) == cs(p3, p2));
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assert(!cs(p1, w2));
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assert(!cs(p2, w1));
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assert(cs(p1, w3) || cs(p3, w1));
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assert(cs(p3, w1) == cs(p3, w2));
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}
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{
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typedef std::owner_less<std::weak_ptr<int> > CS;
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CS cs;
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assert(!cs(w1, w2));
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assert(!cs(w2, w1));
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assert(cs(w1, w3) || cs(w3, w1));
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assert(cs(w3, w1) == cs(w3, w2));
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assert(!cs(w1, p2));
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assert(!cs(w2, p1));
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assert(cs(w1, p3) || cs(w3, p1));
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assert(cs(w3, p1) == cs(w3, p2));
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}
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}
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