New class simgear::Map extending std::map interface.

simgear/nasal/cppbind/cppbind_test.cxx

@@ -3,6 +3,7 @@
 #include "Ghost.hxx"
 #include "NasalHash.hxx"
 #include "NasalString.hxx"
+#include <simgear/structure/map.hxx>
 
 #include <boost/shared_ptr.hpp>
 #include <boost/weak_ptr.hpp>
@@ -256,6 +257,13 @@ int main(int argc, char* argv[])
   std::map<std::string, std::vector<int> > int_vector_map;
   VERIFY( naIsHash(to_nasal(c, int_vector_map)) );
 
+  simgear::StringMap dict =
+    simgear::StringMap("hello", "value")
+                      ("key2", "value2");
+  naRef na_dict = to_nasal(c, dict);
+  VERIFY( naIsHash(na_dict) );
+  VERIFY( Hash(na_dict, c).get<std::string>("key2") == "value2" );
+
   // Check converting to Ghost if using Nasal hashes with actual ghost inside
   // the hashes parents vector
   std::vector<naRef> parents;

simgear/structure/CMakeLists.txt

@@ -22,6 +22,7 @@ set(HEADERS
     event_mgr.hxx
     exception.hxx
     intern.hxx
+    map.hxx
     subsystem_mgr.hxx
     StateMachine.hxx
     )

simgear/structure/map.hxx

@@ -0,0 +1,69 @@
+///@file Extended std::map with methods for easier usage.
+//
+// Copyright (C) 2013  Thomas Geymayer <tomgey@gmail.com>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
+
+#ifndef SG_MAP_HXX_
+#define SG_MAP_HXX_
+
+#include <map>
+#include <string>
+
+namespace simgear
+{
+
+  template<class Key, class Value>
+  class Map:
+    public std::map<Key, Value>
+  {
+    public:
+      Map() {}
+
+      /**
+       * Initilize a new mape with the given key/value pair.
+       */
+      Map(const Key& key, const Value& value)
+      {
+        (*this)[key] = value;
+      }
+
+      /**
+       * Change/add new value.
+       */
+      Map& operator()(const Key& key, const Value& value)
+      {
+        (*this)[key] = value;
+        return *this;
+      }
+
+      /**
+       * Retrive a value (or get a default value if it does not exist).
+       */
+      Value get(const Key& key, const Value& def = Value()) const
+      {
+        typename Map::const_iterator it = this->find(key);
+        if( it != this->end() )
+          return it->second;
+
+        return def;
+      }
+  };
+
+  typedef Map<std::string, std::string> StringMap;
+
+} // namespace simgear
+
+#endif /* SG_MAP_HXX_ */