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+
+#ifndef BOOST_CONTRACT_DETAIL_AUTO_PTR_HPP_
+#define BOOST_CONTRACT_DETAIL_AUTO_PTR_HPP_
+
+// Copyright (C) 2008-2018 Lorenzo Caminiti
+// Distributed under the Boost Software License, Version 1.0 (see accompanying
+// file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
+// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
+
+#include <boost/contract/detail/operator_safe_bool.hpp>
+#include <boost/contract/detail/debug.hpp>
+#include <boost/config.hpp>
+
+namespace boost { namespace contract { namespace detail {
+
+// Using this instead of std::auto_ptr because std::auto_ptr will be removed in
+// C++17 (this library always uses release() to avoid ownership issues).
+template<typename T>
+class auto_ptr { // Copyable (using default copy operations).
+public:
+ explicit auto_ptr(T* ptr = 0) : ptr_(ptr) {}
+
+ ~auto_ptr() BOOST_NOEXCEPT_IF(false) { delete ptr_; }
+
+ T* release() {
+ T* ptr = ptr_;
+ ptr_ = 0;
+ return ptr;
+ }
+
+ T& operator*() {
+ BOOST_CONTRACT_DETAIL_DEBUG(ptr_);
+ return *ptr_;
+ }
+
+ T const& operator*() const {
+ BOOST_CONTRACT_DETAIL_DEBUG(ptr_);
+ return *ptr_;
+ }
+
+ T* operator->() { return ptr_; }
+ T const* operator->() const { return ptr_; }
+
+ BOOST_CONTRACT_DETAIL_OPERATOR_SAFE_BOOL(auto_ptr<T>, !!ptr_)
+
+private:
+ T* ptr_;
+};
+
+} } } // namespace
+
+#endif // #include guard
+