Move C structures wrappers from core.hpp to core_c.h

Also move RTTIImpl class to the only usage

modules/objdetect/src/hog.cpp

@@ -1301,6 +1301,58 @@ void HOGDescriptor::detectMultiScale(const Mat& img, std::vector<Rect>& foundLoc
                 padding, scale0, finalThreshold, useMeanshiftGrouping);
 }
 
+template<typename _ClsName> struct RTTIImpl
+{
+public:
+    static int isInstance(const void* ptr)
+    {
+        static _ClsName dummy;
+        static void* dummyp = &dummy;
+        union
+        {
+            const void* p;
+            const void** pp;
+        } a, b;
+        a.p = dummyp;
+        b.p = ptr;
+        return *a.pp == *b.pp;
+    }
+    static void release(void** dbptr)
+    {
+        if(dbptr && *dbptr)
+        {
+            delete (_ClsName*)*dbptr;
+            *dbptr = 0;
+        }
+    }
+    static void* read(CvFileStorage* fs, CvFileNode* n)
+    {
+        FileNode fn(fs, n);
+        _ClsName* obj = new _ClsName;
+        if(obj->read(fn))
+            return obj;
+        delete obj;
+        return 0;
+    }
+
+    static void write(CvFileStorage* _fs, const char* name, const void* ptr, CvAttrList)
+    {
+        if(ptr && _fs)
+        {
+            FileStorage fs(_fs);
+            fs.fs.addref();
+            ((const _ClsName*)ptr)->write(fs, String(name));
+        }
+    }
+
+    static void* clone(const void* ptr)
+    {
+        if(!ptr)
+            return 0;
+        return new _ClsName(*(const _ClsName*)ptr);
+    }
+};
+
 typedef RTTIImpl<HOGDescriptor> HOGRTTI;
 
 CvType hog_type( CV_TYPE_NAME_HOG_DESCRIPTOR, HOGRTTI::isInstance,