/usr/include/libmesh/factory.h is in libmesh-dev 0.7.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// The libMesh Finite Element Library.
// Copyright (C) 2002-2008 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
// This library 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 2.1 of the License, or (at your option) any later version.
// This library 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 for more details.
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#ifndef __factory_h__
#define __factory_h__
// System & C++ includes
#include <string>
#include <map>
// Local includes
#include "libmesh_common.h"
#include "auto_ptr.h"
namespace libMesh
{
/**
* Factory class defintion.
*/
template <class Base>
class Factory
{
protected:
/**
* Constructor. Takes the name to be mapped.
*/
Factory (const std::string& name);
public:
/**
* Destructor. (Empty.)
*/
virtual ~Factory () {}
/**
* Builds an object of type Base identified by name.
*/
static AutoPtr<Base> build (const std::string& name);
/**
* Create a Base class. Force this to be implemented
* later.
*/
virtual AutoPtr<Base> create () = 0;
protected:
/**
* Map from a name to a Factory<Base>* pointer.
*/
static std::map<std::string, Factory<Base>*>& factory_map();
};
/**
* Factory implementation class.
*/
template <class Derived, class Base>
class FactoryImp: public Factory<Base>
{
public:
/**
* Constructor. Takes a name as input.
*/
FactoryImp (const std::string& name) : Factory<Base>(name) { }
/**
* Destructor. Empty.
*/
~FactoryImp () {}
private:
/**
* @returns a new object of type Derived.
*/
AutoPtr<Base> create ();
};
// -----------------------------------------------------
// Factory members
template <class Base>
inline
Factory<Base>::Factory (const std::string& name)
{
// Make sure we haven't already added this name
// to the map
libmesh_assert (!factory_map().count(name));
factory_map()[name] = this;
}
template <class Base>
inline
AutoPtr<Base> Factory<Base>::build (const std::string& name)
{
// name not found in the map
if (!factory_map().count(name))
{
libMesh::err << "Tried to build an unknown type: " << name << std::endl;
libMesh::err << "valid options are:" << std::endl;
for (typename std::map<std::string,Factory<Base>*>::const_iterator
it = factory_map().begin(); it != factory_map().end(); ++it)
libMesh::err << " " << it->first << std::endl;
libmesh_error();
// Do this the stoopid way for IBM xlC
AutoPtr<Base> ret_val (NULL);
return ret_val;
}
// Do this the stoopid way for IBM xlC
Factory<Base> *f = factory_map()[name];
AutoPtr<Base> ret_val (f->create());
return ret_val;
}
// Note - this cannot be inlined!
// template <class Base>
// std::map<std::string, Factory<Base>*>& Factory<Base>::factory_map()
// {
// static std::map<std::string, Factory<Base>*> _factory_map;
// return _factory_map;
// }
template <class Derived, class Base>
inline
AutoPtr<Base> FactoryImp<Derived,Base>::create ()
{
// Do this the stoopid way for IBM xlC
AutoPtr<Base> ret_val (new Derived);
return ret_val;
}
} // namespace libMesh
#endif
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