base_content.h

//                                                                             
//  Copyright (C) 2008-2012  Artyom Beilis (Tonkikh) <artyomtnk@yahoo.com>     
//                                                                             
//  See accompanying file COPYING.TXT file for licensing details.
//
#ifndef CPPCMS_BASE_CONTENT_H
#define CPPCMS_BASE_CONTENT_H

#include <cppcms/defs.h>
#include <booster/copy_ptr.h>

namespace cppcms {

        class application;

        class CPPCMS_API base_content {
        public:

                base_content();
                base_content(base_content const &);
                base_content const &operator=(base_content const &);
                virtual ~base_content();

                application &app();
                void app(application &app);

                void reset_app();
                bool has_app();

                class app_guard {
                        app_guard(app_guard const &);
                        void operator=(app_guard const &);
                public:
                        app_guard(base_content &c,application &a) : p_(0)
                        {
                                if(!c.has_app()) {
                                        p_=&c;
                                        c.app(a);
                                }
                        }
                        app_guard(base_content &c,base_content &parent) : p_(0)
                        {
                                if(!c.has_app() && parent.has_app()) {
                                        p_ = &c;
                                        c.app(parent.app());
                                }
                        }
                        ~app_guard()
                        {
                                if(p_) {
                                        p_->reset_app();
                                        p_ = 0;
                                }
                        }
                private:
                        base_content *p_;
                };

        private:
                struct _data;
                booster::copy_ptr<_data> d;
                application *app_;
        };

}


#endif