function b=gfObject(a)
% converts a getfem struct to an object such as gfMesh, gfFem etc..    
%  Copyright (C) 1999-2017 Yves Renard
%
%  This file is a part of GetFEM++
%
%  GetFEM++  is  free software;  you  can  redistribute  it  and/or modify it
%  under  the  terms  of the  GNU  Lesser General Public License as published
%  by  the  Free Software Foundation;  either version 3 of the License,  or
%  (at your option) any later version along with the GCC Runtime Library
%  Exception either version 3.1 or (at your option) any later version.
%  This program  is  distributed  in  the  hope  that it will be useful,  but
%  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
%  or  FITNESS  FOR  A PARTICULAR PURPOSE.  See the GNU Lesser General Public
%  License and GCC Runtime Library Exception for more details.
%  You  should  have received a copy of the GNU Lesser General Public License
%  along  with  this program;  if not, write to the Free Software Foundation,
%  Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
  if (isempty(a))
    b=[];
  elseif (isobject(a))
    b=a;
  elseif (isstruct(a) && numel(a))
    sclass = gf_workspace('class name',a(1));
    b=feval(sclass,a);
  else error('neither an object nor a struct');
  end;
