68 lines
2.4 KiB
C++
68 lines
2.4 KiB
C++
/*
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Copyright (c) 2010-2018, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_COPY_PTR
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#define TORRENT_COPY_PTR
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#include <memory>
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namespace libtorrent {
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template <class T>
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struct copy_ptr
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{
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copy_ptr() = default;
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explicit copy_ptr(T* t): m_ptr(t) {}
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copy_ptr(copy_ptr const& p): m_ptr(p.m_ptr ? new T(*p.m_ptr) : nullptr) {}
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copy_ptr(copy_ptr&& p) noexcept = default;
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void reset(T* t = nullptr) { m_ptr.reset(t); }
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copy_ptr& operator=(copy_ptr const& p)
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{
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if (m_ptr == p.m_ptr) return *this;
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m_ptr.reset(p.m_ptr ? new T(*p.m_ptr) : nullptr);
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return *this;
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}
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copy_ptr& operator=(copy_ptr&& p) noexcept = default;
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T* operator->() { return m_ptr.get(); }
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T const* operator->() const { return m_ptr.get(); }
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T& operator*() { return *m_ptr; }
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T const& operator*() const { return *m_ptr; }
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void swap(copy_ptr<T>& p) { std::swap(*this, p); }
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explicit operator bool() const { return m_ptr.get() != nullptr; }
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private:
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std::unique_ptr<T> m_ptr;
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};
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}
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#endif // TORRENT_COPY_PTR
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