Added virtual destructor to reader and writer classes in order to avoid compiler warnings.

git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@84 fdac6126-5c0c-442c-9429-916003d36597

Core/IO/reader/BaseReader.hh

@@ -69,6 +69,9 @@ class BaseReader
 {
 public:
 
+  /// Destructor
+  virtual ~BaseReader() {};
+
   /// Returns a brief description of the file type that can be parsed.
   virtual std::string get_description() const = 0;
   

Core/IO/reader/OFFReader.hh

@@ -101,6 +101,9 @@ public:
 
   _OFFReader_();
 
+  /// Destructor
+  virtual ~_OFFReader_() {};
+
   std::string get_description() const { return "Object File Format"; }
   std::string get_extensions()  const { return "off"; }
   std::string get_magic()       const { return "OFF"; }

Core/IO/reader/STLReader.hh

@@ -74,6 +74,9 @@ public:
   // constructor
   _STLReader_();
 
+  /// Destructor
+  virtual ~_STLReader_() {};
+
 
   std::string get_description() const 
   { return "Stereolithography Interface Format"; }

Core/IO/writer/BaseWriter.hh

@@ -68,6 +68,9 @@ public:
 
   typedef unsigned int Option;
 
+  /// Destructor
+  virtual ~BaseWriter() {};
+   
   /// Return short description of the supported file format.
   virtual std::string get_description() const = 0;
   

Core/IO/writer/OBJWriter.hh

@@ -67,6 +67,9 @@ public:
 
   _OBJWriter_();
 
+  /// Destructor
+  virtual ~_OBJWriter_() {};
+
   std::string get_description() const  { return "Alias/Wavefront"; }
   std::string get_extensions()  const  { return "obj"; }
 

Core/IO/writer/OFFWriter.hh

@@ -79,6 +79,8 @@ public:
 
   _OFFWriter_();
 
+  virtual ~_OFFWriter_() {};
+
   std::string get_description() const { return "no description"; }
   std::string get_extensions() const  { return "off"; }
 

Core/IO/writer/OMWriter.hh

@@ -74,9 +74,12 @@ class _OMWriter_ : public BaseWriter
 {
 public:
 
-  // constructor
+  /// Constructor
   _OMWriter_();
 
+  /// Destructor
+  virtual ~_OMWriter_() {};
+
   std::string get_description() const
   { return "OpenMesh Format"; }
   

Core/IO/writer/PLYWriter.hh

@@ -73,6 +73,9 @@ public:
 
   _PLYWriter_();
 
+  /// Destructor
+  virtual ~_PLYWriter_() {};
+
   std::string get_description() const { return "PLY polygon file format"; }
   std::string get_extensions() const  { return "ply"; }
 

Core/IO/writer/STLWriter.hh

@@ -71,6 +71,9 @@ public:
   
   _STLWriter_();
 
+  /// Destructor
+  virtual ~_STLWriter_() {};
+  
   std::string get_description() const { return "Stereolithography Format"; }
   std::string get_extensions()  const { return "stla stlb"; }