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source: code/branches/presentation/src/core/Super.h @ 2471

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1/*
2 *   ORXONOX - the hottest 3D action shooter ever to exist
3 *                    > www.orxonox.net <
4 *
5 *
6 *   License notice:
7 *
8 *   This program is free software; you can redistribute it and/or
9 *   modify it under the terms of the GNU General Public License
10 *   as published by the Free Software Foundation; either version 2
11 *   of the License, or (at your option) any later version.
12 *
13 *   This program is distributed in the hope that it will be useful,
14 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
15 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 *   GNU General Public License for more details.
17 *
18 *   You should have received a copy of the GNU General Public License
19 *   along with this program; if not, write to the Free Software
20 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
21 *
22 *   Author:
23 *      Fabian 'x3n' Landau
24 *   Co-authors:
25 *      ...
26 *
27 */
28
29/**
30    @file
31    @brief Definition of all super-function related macros.
32
33    This file defines all macros needed to add a new "super-function".
34    If you add a super-function, you can call SUPER(myclass, functionname) inside your
35    code and the function of the parentclass gets called. This is comparable with
36    super.functionname() in Java or other languages.
37
38    This works only with virtual functions that return nothing (void) and belong to
39    classes that have an Identifier. Arguments however are supported.
40
41    To add a new super-function, you have process 4 steps:
42
43    1) Add a new SUPER macro
44       This allows you to call the super-function in your code.
45       Location: This file (Super.h), marked with --> HERE <-- comments (1/3)
46
47    2) Call the SUPER_FUNCTION_GLOBAL_DECLARATION_PART1/2 macros.
48       This defines some global classes and templates, needed to create and call the super-functions.
49       Location: This file (Super.h), marked with --> HERE <-- comments (2/3)
50
51    3) Call the SUPER_INTRUSIVE_DECLARATION macro.
52       This will be included into the declaration of ClassIdentifier<T>.
53       Location: This file (Super.h), marked with --> HERE <-- comments (3/3)
54
55    4) Call the SUPER_FUNCTION macro.
56       This defines a partially specialized template that will decide if a class is "super" to another class.
57       If the check returns true, a SuperFunctionCaller gets created, which will be used by the SUPER macro.
58       You have to add this into the header-file of the baseclass of the super-function (the class that first
59       implements the function), below the class declaration. You can't call it directly in this file, because
60       otherwise you had to include the headerfile right here, which would cause some ugly backdependencies,
61       include loops and slower compilation.
62       Dont forget to include Super.h in the header-file.
63       Location: The header-file of the baseclass (Baseclass.h), below the class declaration
64*/
65
66#ifndef _Super_H__
67#define _Super_H__
68
69#include <iostream>
70
71#include "CorePrereqs.h"
72
73#include "util/Debug.h"
74#include "XMLIncludes.h"
75#include "Event.h"
76
77///////////////////////
78// Macro definitions //
79///////////////////////
80
81//// Common macros ////
82
83    /**
84        @brief Declares a new super-function by creating a specialized template. Add this below the class declaration of the baseclass.
85        @param functionnumber Each super-function needs a unique number, starting with zero, increasing by one
86        @param baseclass The baseclass of the super-function (~the root)
87        @param functionname The name of the super-function
88        @param purevirtualbase "true" if the function is pure virtual in the baseclass, "false" if the function is implemented (without "")
89    */
90    #define SUPER_FUNCTION(functionnumber, baseclass, functionname, purevirtualbase) \
91        template <class T, int templatehack2> \
92        struct SuperFunctionCondition<functionnumber, T, 0, templatehack2> \
93        { \
94            static void check() \
95            { \
96                SuperFunctionCondition<functionnumber, T, 0, templatehack2>::apply((T*)0); \
97                SuperFunctionCondition<functionnumber + 1, T, 0, templatehack2>::check(); \
98            } \
99            \
100            static void apply(void* temp) {} \
101            static void apply(baseclass* temp) \
102            { \
103                ClassIdentifier<T>* identifier = ClassIdentifier<T>::getIdentifier(); \
104                for (std::set<const Identifier*>::iterator it = identifier->getDirectChildrenIntern().begin(); it != identifier->getDirectChildrenIntern().end(); ++it) \
105                { \
106                    if (!((ClassIdentifier<T>*)(*it))->superFunctionCaller_##functionname##_) \
107                    { \
108                        COUT(5) << "Added SuperFunctionCaller for " << #functionname << ": " << ClassIdentifier<T>::getIdentifier()->getName() << " <- " << ((ClassIdentifier<T>*)(*it))->getName() << std::endl; \
109                        ((ClassIdentifier<T>*)(*it))->superFunctionCaller_##functionname##_ = new SuperFunctionClassCaller_##functionname <T>; \
110                    } \
111                } \
112            } \
113        }; \
114        \
115        SUPER_FUNCTION_PUREVIRTUAL_WORKAROUND##purevirtualbase(functionnumber, baseclass)
116
117    #define SUPER_FUNCTION_PUREVIRTUAL_WORKAROUND0(functionnumber, baseclass) SUPER_FUNCTION_PUREVIRTUAL_WORKAROUNDfalse(functionnumber, baseclass)
118    #define SUPER_FUNCTION_PUREVIRTUAL_WORKAROUND1(functionnumber, baseclass) SUPER_FUNCTION_PUREVIRTUAL_WORKAROUNDtrue(functionnumber, baseclass)
119    #define SUPER_FUNCTION_PUREVIRTUAL_WORKAROUNDfalse(functionnumber, baseclass)
120    #define SUPER_FUNCTION_PUREVIRTUAL_WORKAROUNDtrue(functionnumber, baseclass) \
121        template <int templatehack2> \
122        struct SuperFunctionCondition<functionnumber, baseclass, 0, templatehack2> \
123        { \
124            static void check() \
125            { \
126                SuperFunctionCondition<functionnumber + 1, baseclass, 0, templatehack2>::check(); \
127            } \
128        };
129
130
131    /*
132    //// Comments about the macro ////
133
134        // Partially specialized template (templatehack is now specialized too).
135        //
136        // This ensures the compiler takes THIS template if the header-file of the super-function
137        // is included. In any other case, the compiler just uses the fallback template which is
138        // defined in this file.
139        template <class T, templatehack2>
140        struct SuperFunctionCondition<functionnumber, T, 0, templatehack2>
141        {
142            static void check()
143            {
144                // This call to the apply-function is the whole check. By calling the function with
145                // a T* pointer, the right function get's called.
146                SuperFunctionCondition<functionnumber, T, 0, templatehack2>::apply((T*)0);
147
148                // Go go the check for of next super-function (functionnumber + 1)
149                SuperFunctionCondition<functionnumber + 1, T, 0, templatehack2>::check();
150            }
151
152            // This function gets called if T is not a child of the baseclass.
153            // The function does nothing.
154            static void apply(void* temp) {}
155
156            // This function gets called if T is a child of the baseclass and can therefore be converted.
157            // The function adds a SuperFunctionCaller to the Identifier of all subclasses of T.
158            static void apply(baseclass* temp)
159            {
160                ClassIdentifier<T>* identifier = ClassIdentifier<T>::getIdentifier();
161
162                // Iterate through all children
163                for (std::set<const Identifier*>::iterator it = identifier->getDirectChildrenIntern().begin(); it != identifier->getDirectChildrenIntern().end(); ++it)
164                {
165                    // Check if there's not already a caller
166                    if (!((ClassIdentifier<T>*)(*it))->superFunctionCaller_##functionname##_)
167                    {
168                        // Add the SuperFunctionCaller
169                        COUT(5) << "adding functionpointer to " << ((ClassIdentifier<T>*)(*it))->getName() << std::endl;
170                        ((ClassIdentifier<T>*)(*it))->superFunctionCaller_##functionname##_ = new SuperFunctionClassCaller_##functionname <T>;
171                    }
172                }
173            }
174        };
175        SUPER_FUNCTION_PUREVIRTUAL_WORKAROUND##purevirtualbase
176
177
178        // The following piece of code is only added if purevirtualbase = true
179
180        // Explicit specialization of the Condition template for the baseclass to avoid
181        // errors if the function is pure virtual in the baseclass.
182        template <int templatehack2> \
183        struct SuperFunctionCondition<functionnumber, baseclass, 0, templatehack2> \
184        { \
185            // The check function just behaves like the fallback - it advances to the check for the next super-function (functionnumber + 1)
186            static void check() \
187            { \
188                SuperFunctionCondition<functionnumber + 1, baseclass, 0, templatehack2>::check(); \
189            } \
190        };
191    */
192
193    // SUPER-macro: Calls Parent::functionname() where Parent is the direct parent of classname
194    #define SUPER(classname, functionname, ...) \
195        SUPER_##functionname(classname, functionname, __VA_ARGS__)
196
197    // helper macro: for functions without arguments
198    #define SUPER_NOARGS(classname, functionname) \
199        (*ClassIdentifier<classname>::getIdentifier()->superFunctionCaller_##functionname##_)(this)
200
201    // helper macro: for functions with arguments
202    #define SUPER_ARGS(classname, functionname, ...) \
203        (*ClassIdentifier<classname>::getIdentifier()->superFunctionCaller_##functionname##_)(this, __VA_ARGS__)
204
205
206//// Function-specific macros ////
207
208    /*
209        Add a macro for each super-function
210
211        Example (no arguments):
212        #define SUPER_myfunction(classname, functionname, ...) \
213            SUPER_NOARGS(classname, functionname)
214
215        Example (with arguments):
216        #define SUPER_myfunction(classname, functionname, ...) \
217            SUPER_ARGS(classname, functionname, __VA_ARGS__)
218    */
219
220    // (1/3) --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <--
221    #define SUPER_XMLPort(classname, functionname, ...) \
222        SUPER_ARGS(classname, functionname, __VA_ARGS__)
223
224    #define SUPER_tick(classname, functionname, ...) \
225        SUPER_ARGS(classname, functionname, __VA_ARGS__)
226
227    #define SUPER_changedActivity(classname, functionname, ...) \
228        SUPER_NOARGS(classname, functionname)
229
230    #define SUPER_changedVisibility(classname, functionname, ...) \
231        SUPER_NOARGS(classname, functionname)
232
233    #define SUPER_processEvent(classname, functionname, ...) \
234        SUPER_ARGS(classname, functionname, __VA_ARGS__)
235    // (1/3) --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <--
236
237
238namespace orxonox
239{
240    /////////////////////////////////////////////////////////////////////////////////////////////////////
241    // This code gets included by Identifier.h and every other header file that needs a super-function //
242    /////////////////////////////////////////////////////////////////////////////////////////////////////
243
244    //// Common code ////
245
246        // Base templates
247        /**
248            @brief Creates the SuperFunctionCaller if T is a child of the super-functions baseclass.
249        */
250        template <int functionnumber, class T, int templatehack1, int templatehack2>
251        struct SuperFunctionCondition
252        {
253            static void check() {}
254        };
255
256        /**
257            @brief Initializes the SuperFunctionCaller-pointer with zero.
258        */
259        template <int functionnumber, class T>
260        struct SuperFunctionInitialization
261        {
262            static void initialize(ClassIdentifier<T>* identifier) {}
263        };
264
265        /**
266            @brief Deletes the SuperFunctionCaller.
267        */
268        template <int functionnumber, class T>
269        struct SuperFunctionDestruction
270        {
271            static void destroy(ClassIdentifier<T>* identifier) {}
272        };
273
274
275    //// Function-specific code ////
276
277        /**
278            @brief Creates the needed objects and templates to call a super-function.
279            @param functionnumber Each super-function needs a unique number, starting with zero, increasing by one
280            @param functionname The name of the super-function
281            @param hasarguments "false" if the function doesn't take any arguments, "true" if it does (without "")
282            @param ... Variadic: If the function takes arguments, add them here with type and name. Example: int myvalue, float myothervalue
283        */
284        #define SUPER_FUNCTION_GLOBAL_DECLARATION_PART1(functionnumber, functionname, hasarguments, ...) \
285            template <class T, int templatehack1, int templatehack2> \
286            struct SuperFunctionCondition<functionnumber, T, templatehack1, templatehack2> \
287            { \
288                static void check() \
289                { \
290                    SuperFunctionCondition<functionnumber + 1, T, templatehack1, templatehack2>::check(); \
291                } \
292            }; \
293            \
294            template <class T> \
295            struct SuperFunctionInitialization<functionnumber, T> \
296            { \
297                static void initialize(ClassIdentifier<T>* identifier) \
298                { \
299                    identifier->superFunctionCaller_##functionname##_ = 0; \
300                    SuperFunctionInitialization<functionnumber + 1, T>::initialize(identifier); \
301                } \
302            }; \
303            \
304            template <class T> \
305            struct SuperFunctionDestruction<functionnumber, T> \
306            { \
307                static void destroy(ClassIdentifier<T>* identifier) \
308                { \
309                    if (identifier->superFunctionCaller_##functionname##_) \
310                        delete identifier->superFunctionCaller_##functionname##_; \
311                    SuperFunctionDestruction<functionnumber + 1, T>::destroy(identifier); \
312                } \
313            }; \
314            \
315            class _CoreExport SuperFunctionCaller_##functionname \
316            { \
317                public: \
318                    virtual void operator()( SUPER_CALL_ARGUMENTS##hasarguments(__VA_ARGS__) ) = 0; \
319                    virtual ~SuperFunctionCaller_##functionname () {} \
320            }; \
321            \
322            template <class T> \
323            class SuperFunctionClassCaller_##functionname : public SuperFunctionCaller_##functionname \
324            { \
325                public: \
326                    inline void operator()( SUPER_CALL_ARGUMENTS##hasarguments(__VA_ARGS__) ) \
327                    { \
328                        (dynamic_cast<T*>(object))->T:: functionname
329
330        /*
331            JUST ADD THE FUNCTION ARGUMENTS BETWEEN BOTH MACROS, ENCLOSED BY BRACKETS
332            EXAMPLE:
333
334              SUPER_FUNCTION_GLOBAL_DECLARATION_PART1(0, myfunction, true, int myvalue, float myothervalue) <-- !!! DONT ADD A SEMICOLON HERE !!!
335                (myvalue, myothervalue)
336              SUPER_FUNCTION_GLOBAL_DECLARATION_PART2
337        */
338
339        #define SUPER_FUNCTION_GLOBAL_DECLARATION_PART2 \
340                                                        ; \
341                    } \
342            };
343
344        #define SUPER_CALL_ARGUMENTSfalse(...) OrxonoxClass* object
345        #define SUPER_CALL_ARGUMENTS0(...)     OrxonoxClass* object
346        #define SUPER_CALL_ARGUMENTStrue(...) OrxonoxClass* object, __VA_ARGS__
347        #define SUPER_CALL_ARGUMENTS1(...)    OrxonoxClass* object, __VA_ARGS__
348
349
350    /*
351    //// COMMENTS ABOUT THE MACRO ////
352
353        // Partially specialized template (templatehack not yet specialized, this
354        // will be done by the real condition in the header-file of the super-function)
355        // Only used as fallback
356        template <class T, int templatehack1, int templatehack2>
357        struct SuperFunctionCondition<functionnumber, T, templatehack1, templatehack2>
358        {
359            // If this function gets called, the header-file of the super function is not
360            // included, so this fallback template (templatehack not specialized) is used
361            static void check()
362            {
363                // Calls the condition-check of the next super-function (functionnumber + 1)
364                SuperFunctionCondition<functionnumber + 1, T, templatehack1, templatehack2>::check();
365            }
366        };
367
368        // Initializes the SuperFunctionCaller-pointer with zero.
369        template <class T>
370        struct SuperFunctionInitialization<functionnumber, T>
371        {
372            static void initialize(ClassIdentifier<T>* identifier)
373            {
374                identifier->superFunctionCaller_##functionname##_ = 0;
375
376                // Calls the initialization of the next super-function (functionnumber + 1)
377                SuperFunctionInitialization<functionnumber + 1, T>::initialize(identifier);
378            }
379        };
380
381        // Deletes the SuperFunctionCaller.
382        template <class T>
383        struct SuperFunctionDestruction<functionnumber, T>
384        {
385            static void destroy(ClassIdentifier<T>* identifier)
386            {
387                if (identifier->superFunctionCaller_##functionname##_)
388                    delete identifier->superFunctionCaller_##functionname##_;
389
390                // Calls the destruction of the next super-function (functionnumber + 1)
391                SuperFunctionDestruction<functionnumber + 1, T>::destroy(identifier);
392            }
393        };
394
395        // Baseclass of the super-function caller. The real call will be done by a
396        // templatized subclass through the virtual () operator.
397        class _CoreExport SuperFunctionCaller_##functionname
398        {
399            public:
400                virtual void operator()( SUPER_CALL_ARGUMENTS##hasarguments(__VA_ARGS__) ) = 0;
401                virtual ~SuperFunctionCaller_##functionname () {}
402        };
403
404        // The real super-function caller: Calls T::functionname()
405        // T should be the parent, but this will be done by the spezialized condition template
406        template <class T>
407        class SuperFunctionClassCaller_##functionname : public SuperFunctionCaller_##functionname
408        {
409            public:
410                // @brief Calls the function.
411                // @param object The object to call the function on
412                // @param ... The arguments of the function
413                inline void operator()( SUPER_CALL_ARGUMENTS##hasarguments(__VA_ARGS__) )
414                {
415                    (dynamic_cast<T*>(object))->T:: functionname ( Call the function with it's arguments );
416                }
417        }
418    */
419
420
421    //// Execute the code for each super-function ////
422
423        // (2/3) --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <--
424        SUPER_FUNCTION_GLOBAL_DECLARATION_PART1(0, XMLPort, true, Element& xmlelement, XMLPort::Mode mode)
425            (xmlelement, mode)
426        SUPER_FUNCTION_GLOBAL_DECLARATION_PART2;
427
428        SUPER_FUNCTION_GLOBAL_DECLARATION_PART1(1, tick, true, float dt)
429            (dt)
430        SUPER_FUNCTION_GLOBAL_DECLARATION_PART2;
431
432        SUPER_FUNCTION_GLOBAL_DECLARATION_PART1(2, changedActivity, false)
433            ()
434        SUPER_FUNCTION_GLOBAL_DECLARATION_PART2;
435
436        SUPER_FUNCTION_GLOBAL_DECLARATION_PART1(3, changedVisibility, false)
437            ()
438        SUPER_FUNCTION_GLOBAL_DECLARATION_PART2;
439
440        SUPER_FUNCTION_GLOBAL_DECLARATION_PART1(4, processEvent, true, Event& event)
441            (event)
442        SUPER_FUNCTION_GLOBAL_DECLARATION_PART2;
443        // (2/3) --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <--
444
445}
446
447#else /* _Super_H__ */
448  #ifdef SUPER_INTRUSIVE_DECLARATION_INCLUDE
449
450//////////////////////////////////////////////////////////////////////////
451// This code gets included within the declaration of ClassIdentifier<T> //
452//////////////////////////////////////////////////////////////////////////
453
454//// Common code ////
455
456    private:
457
458        template <int functionnumber, class TT, int templatehack1, int templatehack2>
459        friend struct SuperFunctionCondition;
460
461        // Creates the super-function-callers by calling the first SuperFunctionCondition check
462        // This get's called within the initialization of an Identifier
463        virtual void createSuperFunctionCaller() const
464        {
465            SuperFunctionCondition<0, T, 0, 0>::check();
466        }
467
468
469//// Function-specific code ////
470
471    public:
472        /**
473            @brief Adds a pointer to the SuperFunctionCaller as a member of ClassIdentifier.
474            @param functionname The name of the super-function
475        */
476        #ifndef SUPER_INTRUSIVE_DECLARATION
477          #define SUPER_INTRUSIVE_DECLARATION(functionname) \
478            SuperFunctionCaller_##functionname * superFunctionCaller_##functionname##_
479        #endif
480
481
482//// Execute the code for each super-function ////
483
484    // (3/3) --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <--
485    SUPER_INTRUSIVE_DECLARATION(XMLPort);
486    SUPER_INTRUSIVE_DECLARATION(tick);
487    SUPER_INTRUSIVE_DECLARATION(changedActivity);
488    SUPER_INTRUSIVE_DECLARATION(changedVisibility);
489    SUPER_INTRUSIVE_DECLARATION(processEvent);
490    // (3/3) --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <-- --> HERE <--
491
492
493    #undef SUPER_INTRUSIVE_DECLARATION_INCLUDE
494  #endif /* SUPER_INTRUSIVE_DECLARATION_INCLUDE */
495#endif /* _Super_H__ */
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