1 #ifndef BOOST_SMART_PTR_ENABLE_SHARED_FROM_HPP_INCLUDED 2 #define BOOST_SMART_PTR_ENABLE_SHARED_FROM_HPP_INCLUDED 3 4 // enable_shared_from.hpp 5 // 6 // Copyright 2019, 2020 Peter Dimov 7 // 8 // Distributed under the Boost Software License, Version 1.0. 9 // See accompanying file LICENSE_1_0.txt or copy at 10 // http://www.boost.org/LICENSE_1_0.txt 11 // 12 // See http://www.boost.org/libs/smart_ptr/ for documentation. 13 14 #include <boost/smart_ptr/enable_shared_from_this.hpp> 15 #include <boost/smart_ptr/detail/sp_noexcept.hpp> 16 17 namespace boost 18 { 19 20 class enable_shared_from: public enable_shared_from_this<enable_shared_from> 21 { 22 private: 23 24 using enable_shared_from_this<enable_shared_from>::shared_from_this; 25 using enable_shared_from_this<enable_shared_from>::weak_from_this; 26 }; 27 28 shared_from(T * p)29template<class T> shared_ptr<T> shared_from( T * p ) 30 { 31 return shared_ptr<T>( p->enable_shared_from_this<enable_shared_from>::shared_from_this(), p ); 32 } 33 weak_from(T * p)34template<class T> weak_ptr<T> weak_from( T * p ) BOOST_SP_NOEXCEPT 35 { 36 return weak_ptr<T>( p->enable_shared_from_this<enable_shared_from>::weak_from_this(), p ); 37 } 38 39 } // namespace boost 40 41 #endif // #ifndef BOOST_SMART_PTR_ENABLE_SHARED_FROM_HPP_INCLUDED 42