#include <simgear/compiler.h>
-#ifdef SG_HAVE_STD_INCLUDES
-# include <istream>
-#elif defined( SG_HAVE_NATIVE_SGI_COMPILERS )
-# include <iostream.h>
-#elif defined( __BORLANDC__ )
-# include <iostream>
-#else
-# include <istream.h>
-#endif
-
#include STL_STRING
#include <set>
-#ifndef _MSC_VER
-# define NDEBUG // she don't work without it.
-#endif
-#include <mk4.h>
-#include <mk4str.h>
-#ifndef _MSC_VER
-# undef NDEBUG
-#endif
+// Forward declarations.
+class c4_Storage;
+class c4_View;
SG_USING_STD(string);
SG_USING_STD(set);
-#if ! defined( SG_HAVE_NATIVE_SGI_COMPILERS )
-SG_USING_STD(istream);
-#endif
-
-
class FGAirport {
public:
};
-inline istream&
-operator >> ( istream& in, FGAirport& a )
-{
- return in >> a.id >> a.latitude >> a.longitude >> a.elevation;
-}
-
class FGAirports {