Method checkWriterOpen

plugins/e57/libE57Format/src/CompressedVectorWriterImpl.cpp:708–718

   }

   void CompressedVectorWriterImpl::checkWriterOpen( const char *srcFileName, int srcLineNumber,
                                                     const char *srcFunctionName ) const
   {
      if ( !isOpen_ )
      {
         throw E57Exception( ErrorWriterNotOpen,
                             "imageFileName=" + cVector_->imageFileName() +
                                " cvPathName=" + cVector_->pathName(),
                             srcFileName, srcLineNumber, srcFunctionName );
      }
   }

#ifdef E57_ENABLE_DIAGNOSTIC_OUTPUT
   void CompressedVectorWriterImpl::dump( int indent, std::ostream &os )