Add mipmap.* to the unix build system

[simgear.git] / simgear / misc / sg_path.cxx

diff --git a/simgear/misc/sg_path.cxx b/simgear/misc/sg_path.cxx
index 0de0d925c514da478da55052bb62b5186d35eb26..73475b0c6d73654f6732e477bede035db156a30d 100644 (file)
--- a/simgear/misc/sg_path.cxx
+++ b/simgear/misc/sg_path.cxx
@@ -358,3 +358,8 @@ bool SGPath::isAbsolute() const
   
   return (path[0] == sgDirPathSep);
 }
+
+bool SGPath::isNull() const
+{
+  return path.empty() || (path == "");
+}