Added FileCloseError exception.

src/TNL/Exceptions/FileCloseError.h

+/***************************************************************************
+                          FileCloseError.h  -  description
+                             -------------------
+    begin                : Mar 5, 2019
+    copyright            : (C) 2019 by Tomas Oberhuber et al.
+    email                : tomas.oberhuber@fjfi.cvut.cz
+ ***************************************************************************/
+
+/* See Copyright Notice in tnl/Copyright */
+
+// Implemented by: Tomas Oberhuber
+
+#pragma once
+
+#include <string>
+#include <stdexcept>
+#include <TNL/String.h>
+
+namespace TNL {
+namespace Exceptions {
+
+class FileCloseError
+   : public std::runtime_error
+{
+public:
+   FileCloseError( const String& fileName )
+   : std::runtime_error( "An error occurred when closing file " + fileName + "." )
+   {}
+};
+
+} // namespace Exceptions
+} // namespace TNL

src/TNL/File.hpp

@@ -20,6 +20,7 @@
 #include <TNL/Exceptions/FileSerializationError.h>
 #include <TNL/Exceptions/FileDeserializationError.h>
 #include <TNL/Exceptions/FileOpenError.h>
+#include <TNL/Exceptions/FileCloseError.h>
 
 namespace TNL {
 
@@ -55,14 +56,18 @@ inline bool File::open( const String& fileName, Mode mode )
 
 inline bool File::close()
 {
-   if( file.is_open() ) {
-      file.close();
-      if( ! file.good() ) {
-         std::cerr << "I was not able to close the file " << fileName << " properly!" << std::endl;
-         return false;
+   if( file.is_open() )
+   {
+      try
+      {
+         file.close();
+      }
+      catch(...)
+      {
+         throw Exceptions::FileCloseError( fileName );
       }
    }
-   // reset all attributes
+   // reset file name
    fileName = "";
    return true;
 }