liuxiaolong
2021-07-20 58d904a328c0d849769b483e901a0be9426b8209
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#ifndef BOOST_SMART_PTR_ENABLE_SHARED_FROM_HPP_INCLUDED
#define BOOST_SMART_PTR_ENABLE_SHARED_FROM_HPP_INCLUDED
 
//  enable_shared_from.hpp
//
//  Copyright 2019, 2020 Peter Dimov
//
//  Distributed under the Boost Software License, Version 1.0.
//  See accompanying file LICENSE_1_0.txt or copy at
//  http://www.boost.org/LICENSE_1_0.txt
//
//  See http://www.boost.org/libs/smart_ptr/ for documentation.
 
#include <boost/smart_ptr/enable_shared_from_this.hpp>
#include <boost/smart_ptr/detail/sp_noexcept.hpp>
 
namespace boost
{
 
class enable_shared_from: public enable_shared_from_this<enable_shared_from>
{
private:
 
    using enable_shared_from_this<enable_shared_from>::shared_from_this;
    using enable_shared_from_this<enable_shared_from>::weak_from_this;
};
 
 
template<class T> shared_ptr<T> shared_from( T * p )
{
    return shared_ptr<T>( p->enable_shared_from_this<enable_shared_from>::shared_from_this(), p );
}
 
template<class T> weak_ptr<T> weak_from( T * p ) BOOST_SP_NOEXCEPT
{
    return weak_ptr<T>( p->enable_shared_from_this<enable_shared_from>::weak_from_this(), p );
}
 
} // namespace boost
 
#endif  // #ifndef BOOST_SMART_PTR_ENABLE_SHARED_FROM_HPP_INCLUDED