Changeset 2194 in orxonox.OLD for orxonox/branches/chris/src/world_entity.cc

Timestamp:

Jul 18, 2004, 12:03:57 PM (21 years ago)

Author:

chris

Message:

orxonox/branches/chris: Implemented is_a() query for WorldEntities

File:

• orxonox/branches/chris/src/world_entity.cc (modified) (2 diffs)

orxonox/branches/chris/src/world_entity.cc

@@ -23 +23 @@
 
 using namespace std;
+
+// initialize the pointers used for is_a identification
+bool (*WorldEntity::basefunc)(char*) = WorldEntity::is_none;
+char *WorldEntity::is = "WorldEntity";
 
 /**
@@ -183 +187 @@
 */
 void WorldEntity::left_world () {}
+
+/**
+        \brief this method can be used to determine what type of WorldEntity a particular pointer represents at runtime
+        \param name: a string specifying the type (use the name of the class)
+        \return true if the entity is in fact of that type or a derivation thereof false if the entity is not related to the specifiead type
+
+        Since this funtion is declared static, it has to be redeclaed and reimplemented in every derivation of WorldEntity, but since it is written
+        very generally you just have to copy paste this function and initialize the two static is_a variables (basefunc and is) correctly.
+        Note that these have to be redeclared as well or you will get a compiler error.
+*/
+bool WorldEntity::is_a (char* name)
+{
+        if( !strcmp( name, is)) return true;
+        else return basefunc (name);
+}
+
+/**
+        \brief basefunc of WorldEntity
+        \param name: not relevant
+        \return false
+        
+        dummy is_a() implementation that returns false only
+*/
+bool WorldEntity::is_none (char* name)
+{
+        return false;
+}