158 lines
3.6 KiB
C++
158 lines
3.6 KiB
C++
#ifndef BOOST_SMART_PTR_SCOPED_PTR_HPP_INCLUDED
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#define BOOST_SMART_PTR_SCOPED_PTR_HPP_INCLUDED
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// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
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// Copyright (c) 2001, 2002 Peter Dimov
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// http://www.boost.org/libs/smart_ptr/scoped_ptr.htm
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//
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#include <boost/config.hpp>
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#include <boost/assert.hpp>
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#include <boost/checked_delete.hpp>
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#include <boost/smart_ptr/detail/sp_nullptr_t.hpp>
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#include <boost/detail/workaround.hpp>
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#ifndef BOOST_NO_AUTO_PTR
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# include <memory> // for std::auto_ptr
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#endif
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namespace boost
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{
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// Debug hooks
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#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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void sp_scalar_constructor_hook(void * p);
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void sp_scalar_destructor_hook(void * p);
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#endif
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// scoped_ptr mimics a built-in pointer except that it guarantees deletion
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// of the object pointed to, either on destruction of the scoped_ptr or via
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// an explicit reset(). scoped_ptr is a simple solution for simple needs;
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// use shared_ptr or std::auto_ptr if your needs are more complex.
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template<class T> class scoped_ptr // noncopyable
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{
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private:
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T * px;
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scoped_ptr(scoped_ptr const &);
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scoped_ptr & operator=(scoped_ptr const &);
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typedef scoped_ptr<T> this_type;
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void operator==( scoped_ptr const& ) const;
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void operator!=( scoped_ptr const& ) const;
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public:
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typedef T element_type;
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explicit scoped_ptr( T * p = 0 ): px( p ) // never throws
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{
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#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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boost::sp_scalar_constructor_hook( px );
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#endif
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}
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#ifndef BOOST_NO_AUTO_PTR
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explicit scoped_ptr( std::auto_ptr<T> p ) BOOST_NOEXCEPT : px( p.release() )
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{
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#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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boost::sp_scalar_constructor_hook( px );
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#endif
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}
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#endif
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~scoped_ptr() // never throws
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{
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#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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boost::sp_scalar_destructor_hook( px );
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#endif
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boost::checked_delete( px );
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}
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void reset(T * p = 0) // never throws
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{
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BOOST_ASSERT( p == 0 || p != px ); // catch self-reset errors
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this_type(p).swap(*this);
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}
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T & operator*() const // never throws
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{
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BOOST_ASSERT( px != 0 );
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return *px;
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}
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T * operator->() const // never throws
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{
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BOOST_ASSERT( px != 0 );
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return px;
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}
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T * get() const BOOST_NOEXCEPT
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{
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return px;
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}
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// implicit conversion to "bool"
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#include <boost/smart_ptr/detail/operator_bool.hpp>
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void swap(scoped_ptr & b) BOOST_NOEXCEPT
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{
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T * tmp = b.px;
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b.px = px;
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px = tmp;
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}
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};
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#if !defined( BOOST_NO_CXX11_NULLPTR )
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template<class T> inline bool operator==( scoped_ptr<T> const & p, boost::detail::sp_nullptr_t ) BOOST_NOEXCEPT
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{
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return p.get() == 0;
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}
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template<class T> inline bool operator==( boost::detail::sp_nullptr_t, scoped_ptr<T> const & p ) BOOST_NOEXCEPT
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{
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return p.get() == 0;
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}
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template<class T> inline bool operator!=( scoped_ptr<T> const & p, boost::detail::sp_nullptr_t ) BOOST_NOEXCEPT
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{
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return p.get() != 0;
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}
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template<class T> inline bool operator!=( boost::detail::sp_nullptr_t, scoped_ptr<T> const & p ) BOOST_NOEXCEPT
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{
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return p.get() != 0;
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}
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#endif
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template<class T> inline void swap(scoped_ptr<T> & a, scoped_ptr<T> & b) BOOST_NOEXCEPT
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{
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a.swap(b);
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}
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// get_pointer(p) is a generic way to say p.get()
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template<class T> inline T * get_pointer(scoped_ptr<T> const & p) BOOST_NOEXCEPT
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{
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return p.get();
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}
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} // namespace boost
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#endif // #ifndef BOOST_SMART_PTR_SCOPED_PTR_HPP_INCLUDED
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