MetaType.h
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00001 /*
00002  * Copyright (C) 2006-2011, SRI International (R)
00003  *
00004  * This program is free software: you can redistribute it and/or modify
00005  * it under the terms of the GNU Lesser General Public License as published by
00006  * the Free Software Foundation, either version 3 of the License, or
00007  * (at your option) any later version.
00008  *
00009  * This program is distributed in the hope that it will be useful,
00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012  * GNU Lesser General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU Lesser General Public License
00015  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
00016  */
00017 
00018 #pragma once
00019 
00020 #ifndef __OpenKarto_MetaType_h__
00021 #define __OpenKarto_MetaType_h__
00022 
00023 #include <OpenKarto/Types.h>
00024 
00025 namespace karto
00026 {
00027 
00029 
00030   
00031   //@cond EXCLUDE
00032 
00036 
00037   // The following code is from the boost library with the following license 
00038   // and modified to fit into the KartoSDK
00039 
00040   // Copyright 2003 (c) The Trustees of Indiana University.
00041 
00042   // Use, modification, and distribution is subject to the Boost Software
00043   // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
00044   // http://www.boost.org/LICENSE_1_0.txt)
00045 
00046   //    Authors: Jaakko Jarvi (jajarvi at osl.iu.edu)
00047   //             Jeremiah Willcock (jewillco at osl.iu.edu)
00048   //             Andrew Lumsdaine (lums at osl.iu.edu)
00049 
00050   template <bool B, class T = void>
00051   struct enable_if_c 
00052   {
00053     typedef T type;
00054   };
00055 
00056   template <class T>
00057   struct enable_if_c<false, T> 
00058   {
00059   };
00060 
00061   template <class Cond, class T = void> 
00062   struct enable_if : public enable_if_c<Cond::value, T> 
00063   {
00064   };
00065 
00066   template <bool B, class T>
00067   struct lazy_enable_if_c 
00068   {
00069     typedef typename T::type type;
00070   };
00071 
00072   template <class T>
00073   struct lazy_enable_if_c<false, T> 
00074   {
00075   };
00076 
00077   template <class Cond, class T> 
00078   struct lazy_enable_if : public lazy_enable_if_c<Cond::value, T>
00079   {
00080   };
00081 
00082   template <bool B, class T = void>
00083   struct disable_if_c
00084   {
00085     typedef T type;
00086   };
00087 
00088   template <class T>
00089   struct disable_if_c<true, T> 
00090   {
00091   };
00092 
00093   template <class Cond, class T = void> 
00094   struct disable_if : public disable_if_c<Cond::value, T> 
00095   {
00096   };
00097 
00098   template <bool B, class T>
00099   struct lazy_disable_if_c 
00100   {
00101     typedef typename T::type type;
00102   };
00103 
00104   template <class T>
00105   struct lazy_disable_if_c<true, T>
00106   {
00107   };
00108 
00109   template <class Cond, class T> 
00110   struct lazy_disable_if : public lazy_disable_if_c<Cond::value, T>
00111   {
00112   };
00113 
00117 
00118   // remove reference
00119   template<class T>
00120   struct remove_reference
00121   {     
00122     typedef T Type;
00123   };
00124 
00125   // remove reference
00126   template<class T>
00127   struct remove_reference<T&>
00128   {     
00129     typedef T Type;
00130   };
00131 
00133   //template<class T>
00134   //struct remove_reference<T&&>
00135   //{   
00136   //  typedef T Type;
00137   //};
00138 
00142 
00143   // is_pointer template - value == false
00144   template <typename T> 
00145   struct is_pointer 
00146   { 
00147     enum 
00148     {
00149       value = false 
00150     };
00151   };
00152 
00153   // is_pointer template - value == true
00154   template <typename T> 
00155   struct is_pointer<T*> 
00156   { 
00157     enum 
00158     {
00159       value = true 
00160     };
00161   };
00162 
00166 
00170   template <typename T>
00171   struct KartoTypeId
00172   {
00173     static const char* Get(kt_bool = true)
00174     {
00175       // Remember to register your class/enum T with the KARTO_TYPE macro
00176       return T::KARTO_REGISTER_ME_WITH_KARTO_TYPE();
00177     }
00178   };
00179 
00183 
00189   template <typename T/*, typename E = void*/>
00190   struct KartoType
00191   {
00192     typedef T Type;
00193   };
00194 
00198   template <typename T> 
00199   struct KartoType<const T>
00200   {
00201     typedef typename KartoType<T>::Type Type;
00202   };
00203 
00208   template <typename T> 
00209   struct KartoType<T&>
00210   {
00211     typedef typename KartoType<T>::Type Type;
00212   };
00213 
00218   template <typename T>
00219   struct KartoType<T*>
00220   {
00221     typedef typename KartoType<T>::Type Type;
00222   };
00223 
00227 
00231   template <typename T>
00232   const char* GetKartoTypeIdTemplate()         
00233   {
00234     return KartoTypeId<typename KartoType<T>::Type>::Get();
00235   }
00236 
00240   template <typename T>
00241   const char* GetKartoTypeIdTemplate(const T&) 
00242   {
00243     return KartoTypeId<typename KartoType<T>::Type>::Get();
00244   }
00245 
00249 
00254   template <typename T, typename E = void>
00255   struct KartoObjectTraits
00256   {
00257     typedef T& RefReturnType;
00258 
00259     static RefReturnType Get(void* pPointer) 
00260     {
00261       return *static_cast<T*>(pPointer);
00262     }
00263   };
00264 
00268   template <typename T>
00269   struct KartoObjectTraits<T*>
00270   {
00271     typedef T* RefReturnType;
00272     typedef T* PointerType;
00273 
00274     static RefReturnType Get(void* pPointer) 
00275     {
00276       return static_cast<T*>(pPointer);
00277     }
00278     
00279     static PointerType GetPointer(T* rValue)
00280     {
00281       return rValue;
00282     }
00283   };
00284 
00288   template <typename T>
00289   struct KartoObjectTraits<T&, typename disable_if<is_pointer<typename KartoObjectTraits<T>::RefReturnType> >::type>
00290   {
00291     typedef T& RefReturnType;
00292     typedef T* PointerType;
00293 
00294     static RefReturnType Get(void* pPointer) 
00295     {
00296       return *static_cast<T*>(pPointer);
00297     }
00298 
00299     static PointerType GetPointer(T& rValue) 
00300     {
00301       return &rValue;
00302     }
00303   };
00304 
00308   template <typename T>
00309   struct KartoObjectTraits<T&, typename enable_if< is_pointer< typename KartoObjectTraits< T >::RefReturnType > >::type > : KartoObjectTraits<T>
00310   {
00311   };
00312 
00316   template <typename T>
00317   struct KartoObjectTraits<const T> : KartoObjectTraits<T>
00318   {
00319   };
00320 
00324 
00329   template <typename T>
00330   struct KartoTypeHasRtti
00331   {
00332     typedef kt_int16s Yes; 
00333     typedef kt_int32s No; 
00334 
00335     template <typename U, const char* (U::*)() const>
00336     struct CheckForMember 
00337     {
00338     };
00339 
00340     template <typename U> static Yes HasMemberFunction(CheckForMember<U, &U::GetKartoClassId>*);
00341     template <typename U> static No HasMemberFunction(...);
00342 
00343     enum
00344     {
00345       value = sizeof(HasMemberFunction<typename KartoType<T>::Type>(0)) == sizeof(Yes)
00346     };
00347   };
00348 
00352 
00357   template <typename T, typename E = void>
00358   struct GetKartoTypeIdTemplateRTTI
00359   {
00360     typedef KartoObjectTraits<const T&> Traits;
00361 
00362     static const char* Get(const T& rObject)
00363     {
00364       typename Traits::PointerType pointer = Traits::GetPointer(rObject);
00365       return pointer ? pointer->GetKartoClassId() : GetKartoTypeIdTemplate<T>();
00366     }
00367   };
00368 
00372   template <typename T>
00373   struct GetKartoTypeIdTemplateRTTI< T, typename disable_if< KartoTypeHasRtti<T> >::type >
00374   {
00375     static const char* Get(const T&)
00376     {
00377       return GetKartoTypeIdTemplate<T>();
00378     }
00379   };
00380 
00384 
00388   template <typename T> const char* GetTypeId()                
00389   {
00390     return GetKartoTypeIdTemplate<T>();
00391   }
00392   
00396   template <typename T> const char* GetTypeId(const T& rObject) 
00397   {
00398     return GetKartoTypeIdTemplateRTTI<T>::Get(rObject);
00399   }
00400 
00401   // @endcond
00402 
00404 
00405 }
00406 
00407 #endif // __OpenKarto_MetaType_h__


nav2d_karto
Author(s): Sebastian Kasperski
autogenerated on Sun Apr 2 2017 03:53:08