cppdb/shared_object.h

//                                                                             
//  Copyright (C) 2010-2011  Artyom Beilis (Tonkikh) <artyomtnk@yahoo.com>     
//                                                                             
//  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)
//
//  or (at your opinion) under:
//
//                               The MIT License
//                 (See accompanying file MIT.txt or a copy at
//              http://www.opensource.org/licenses/mit-license.php)
//
#ifndef CPPDB_SHARED_OBJECT_H
#define CPPDB_SHARED_OBJECT_H

#include <cppdb/defs.h>
#include <cppdb/ref_ptr.h>


namespace cppdb {
        class CPPDB_API shared_object : public ref_counted {
                shared_object() : handle_(0) {}
                shared_object(std::string name,void *h);
                shared_object(shared_object const &);
                void operator=(shared_object const &);
        public:
                ~shared_object();
                static ref_ptr<shared_object> open(std::string const &name);
                void *safe_sym(std::string const &name);

                void *sym(std::string const &name);

                template<typename T>
                bool resolve(std::string const &s,T *&v)
                {
                        void *p=sym(s);
                        if(!p) {
                                return false;
                        }
                        v=(T*)(p);
                        return true;
                }
                template<typename T>
                void safe_resolve(std::string const &s,T *&v)
                {
                        v=(T*)(sym(s));
                }

        private:
                std::string dlname_;
                void *handle_;
        };
}


#endif