Teuchos_AbstractFactoryStd.hpp

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//                    Teuchos: Common Tools Package
//                 Copyright (2004) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
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// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
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// Lesser General Public License for more details.
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#ifndef TEUCHOS_ABSTRACT_FACTORY_STD_HPP
#define TEUCHOS_ABSTRACT_FACTORY_STD_HPP

#include "Teuchos_AbstractFactory.hpp"

namespace Teuchos {

template<class T_impl>
class PostModNothing {
public:
  void initialize(T_impl* p) const {} // required!
};

template<class T_impl>
class AllocatorNew {
public:
  typedef Teuchos::RCP<T_impl>  ptr_t;                         // required!
  const ptr_t allocate() const { return Teuchos::rcp(new T_impl()); }  // required!
};

template<class T_itfc, class T_impl
         ,class T_PostMod = PostModNothing<T_impl>
         ,class T_Allocator = AllocatorNew<T_impl>
        >
class AbstractFactoryStd : public AbstractFactory<T_itfc> {
public:

  typedef typename Teuchos::AbstractFactory<T_itfc>::obj_ptr_t   obj_ptr_t;  // RAB: 20030916: G++ 3.2 complains without this

  AbstractFactoryStd( const T_PostMod& post_mod = T_PostMod(), const T_Allocator& alloc = T_Allocator() );

  obj_ptr_t create() const;

private:
  T_PostMod    post_mod_;
  T_Allocator  alloc_;

};


template<class T_itfc, class T_impl>
RCP<const AbstractFactory<T_itfc> >
abstractFactoryStd()
{
  return rcp(
    new AbstractFactoryStd<T_itfc,T_impl,PostModNothing<T_impl>,AllocatorNew<T_impl> >()
    );
}


template<class T_itfc, class T_impl, class T_Allocator>
RCP<const AbstractFactory<T_itfc> >
abstractFactoryStd( const T_Allocator& alloc = T_Allocator() )
{
  return rcp(
    new AbstractFactoryStd<T_itfc,T_impl,PostModNothing<T_impl>,T_Allocator>(
      PostModNothing<T_impl>(), alloc
      )
    );
}


// ///////////////////////////////////////////////////////
// Template member definitions

template<class T_itfc, class T_impl, class T_PostMod, class T_Allocator>
inline
AbstractFactoryStd<T_itfc,T_impl,T_PostMod,T_Allocator>::AbstractFactoryStd(
  const T_PostMod& post_mod, const T_Allocator& alloc
  )
  :post_mod_(post_mod)
  ,alloc_(alloc)
{}

template<class T_itfc, class T_impl, class T_PostMod, class T_Allocator>
inline
typename AbstractFactoryStd<T_itfc,T_impl,T_PostMod,T_Allocator>::obj_ptr_t
AbstractFactoryStd<T_itfc,T_impl,T_PostMod,T_Allocator>::create() const
{
  typename T_Allocator::ptr_t
    ptr = alloc_.allocate();
  post_mod_.initialize(ptr.get());
  return ptr;
}

} // end Teuchos

#endif // TEUCHOS_ABSTRACT_FACTORY_STD_HPP