Teuchos_RefCountPtr.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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// This library is distributed in the hope that it will be useful, but
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// 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
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// Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
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#ifndef TEUCHOS_REFCOUNTPTR_H
#define TEUCHOS_REFCOUNTPTR_H

#include "Teuchos_RefCountPtrDecl.hpp"
#include "Teuchos_TestForException.hpp"
#include "Teuchos_map.hpp"

// /////////////////////////////////////////////////////////////////////////
// Inline implementations below, not for the client to look at.

namespace Teuchos {

#ifndef DOXYGEN_SHOULD_SKIP_THIS

namespace PrivateUtilityPack {

// Assert that the pointer is not null
void throw_null( const std::string &type_name );

// Node class to keep track of the delete address and
// the reference count for RefCountPtr<...>
class RefCountPtr_node {
public:
  RefCountPtr_node(bool has_ownership)
    : count_(1), has_ownership_(has_ownership), extra_data_map_(NULL)
  {}
  virtual ~RefCountPtr_node()
  {
    if(extra_data_map_) delete extra_data_map_;
  }
  int count() const {
    return count_;  
  }
  int incr_count() {
    return ++count_;
  }
  int deincr_count() {
    return --count_;
  }
  void has_ownership(bool has_ownership) {
    has_ownership_ = has_ownership;
  }
  bool has_ownership() const {
    return has_ownership_;
  }
  void set_extra_data( const any &extra_data, const std::string& name, bool force_unique );
  any& get_extra_data( const std::string& type_name, const std::string& name );
  const any& get_extra_data( const std::string& type_name, const std::string& name ) const {
    return const_cast<RefCountPtr_node*>(this)->get_extra_data(type_name,name);
  }
private:
  typedef Teuchos::map<std::string,any>  extra_data_map_t;
  int                 count_;
  bool                has_ownership_;
  extra_data_map_t    *extra_data_map_;
  // This is made a pointer to reduce overhead for the general case
  // where this is not used
  RefCountPtr_node();
  RefCountPtr_node(const RefCountPtr_node&);
  RefCountPtr_node& operator=(const RefCountPtr_node&);
};  // end class RefCountPtr_node;

// Implementation class for actually deleting the object if has_ownership() == true.
template<class T, class Dealloc_T>
class RefCountPtr_node_tmpl : public RefCountPtr_node {
public:

  //
  RefCountPtr_node_tmpl(T* p, Dealloc_T dealloc, bool has_ownership)
    : RefCountPtr_node(has_ownership), ptr_(p), dealloc_(dealloc)
  {}
  //
  Dealloc_T& get_dealloc() { return dealloc_; }
  //
  const Dealloc_T& get_dealloc() const { return dealloc_; }
  //
  ~RefCountPtr_node_tmpl() {
    if( has_ownership() )
      dealloc_.free(ptr_);
  }

private:

  T           *ptr_;
  Dealloc_T   dealloc_;
  // not defined and not to be called
  RefCountPtr_node_tmpl();
  RefCountPtr_node_tmpl(const RefCountPtr_node_tmpl&);
  RefCountPtr_node_tmpl& operator=(const RefCountPtr_node_tmpl&);

}; // end class RefCountPtr_node_tmpl<T>

} // end namespace PrivateUtilityPack 

#endif

// /////////////////////////////////////////////////////////////////////////////////
// Inline member functions for RefCountPtr<...>.

template<class T>
inline
RefCountPtr<T>::RefCountPtr( ENull )
  : ptr_(NULL)
  , node_(NULL)
{}

template<class T>
REFCOUNTPTR_INLINE
RefCountPtr<T>::RefCountPtr(const RefCountPtr<T>& r_ptr)
  : ptr_(r_ptr.ptr_), node_(r_ptr.node_)
{
  if(node_) node_->incr_count();
}

template<class T>
REFCOUNTPTR_INLINE
template <class T2>
RefCountPtr<T>::RefCountPtr(const RefCountPtr<T2>& r_ptr)
  : ptr_(const_cast<T2*>(r_ptr.get()))                 // will not compile if T1 is not an ancestor of T2
  , node_(const_cast<node_t*>(r_ptr.access_node()))
{
  if(node_) node_->incr_count();
}

template<class T>
REFCOUNTPTR_INLINE
RefCountPtr<T>::~RefCountPtr()
{
  if(node_ && node_->deincr_count() == 0 ) delete node_;
}

template<class T>
REFCOUNTPTR_INLINE
RefCountPtr<T>& RefCountPtr<T>::operator=(const RefCountPtr<T>& r_ptr) {
  if(node_) {
    if( r_ptr.node_ == node_ )
      return *this; // Assignment to self!
    if( !node_->deincr_count() ) {
      delete node_;
    }
  }
  ptr_  = r_ptr.ptr_;
  node_ = r_ptr.node_;
  if(node_) node_->incr_count();
  return *this;
}

template<class T>
inline
T* RefCountPtr<T>::operator->() const {
  assert_not_null();
  return ptr_;
}

template<class T>
inline
T& RefCountPtr<T>::operator*() const {
  assert_not_null();
  return *ptr_;
}

template<class T>
inline
T* RefCountPtr<T>::get() const {
  return ptr_;
}

template<class T>
REFCOUNTPTR_INLINE
T* RefCountPtr<T>::release() {
  if(node_)
    node_->has_ownership(false);
  return ptr_;
}

template<class T>
REFCOUNTPTR_INLINE
int RefCountPtr<T>::count() const {
  if(node_)
    return node_->count();
  return 0;
}

template<class T>
REFCOUNTPTR_INLINE
void RefCountPtr<T>::set_has_ownership() {
  if(node_)
    node_->has_ownership(true);
}

template<class T>
REFCOUNTPTR_INLINE
bool RefCountPtr<T>::has_ownership() const {
  if(node_)
    return node_->has_ownership();
  return false;
}

template<class T>
REFCOUNTPTR_INLINE
bool RefCountPtr<T>::shares_resource(const RefCountPtr<T>& r_ptr) const {
  return node_ == r_ptr.node_;
}

// private

template<class T>
inline
void RefCountPtr<T>::assert_not_null() const {
  if(!ptr_) PrivateUtilityPack::throw_null(typeid(T).name());
}

// very bad public functions

template<class T>
inline
RefCountPtr<T>::RefCountPtr( T* p, bool has_ownership )
  : ptr_(p)
  , node_( p ? new PrivateUtilityPack::RefCountPtr_node_tmpl<T,DeallocDelete<T> >(p,DeallocDelete<T>(),has_ownership) : NULL )
{}

template<class T>
REFCOUNTPTR_INLINE
template<class Dealloc_T>
RefCountPtr<T>::RefCountPtr( T* p, Dealloc_T dealloc, bool has_ownership )
  : ptr_(p)
  , node_( p ? new PrivateUtilityPack::RefCountPtr_node_tmpl<T,Dealloc_T>(p,dealloc,has_ownership) : NULL )
{}

template<class T>
inline
RefCountPtr<T>::RefCountPtr( T* p, node_t* node)
  : ptr_(p), node_(node)
{
  if(node_) node_->incr_count();
}

template<class T>
inline
T*& RefCountPtr<T>::access_ptr()
{ return ptr_; }

template<class T>
inline
typename RefCountPtr<T>::node_t*& RefCountPtr<T>::access_node()
{ return node_; }

template<class T>
inline
typename RefCountPtr<T>::node_t* RefCountPtr<T>::access_node() const
{ return node_; }

} // end namespace Teuchos

// /////////////////////////////////////////////////////////////////////////////////
// Inline member functions for conversions for RefCountPtr<...>.

template<class T>
inline
Teuchos::RefCountPtr<T>
Teuchos::rcp( T* p, bool owns_mem )
{
  return RefCountPtr<T>(p,owns_mem);
}

template<class T, class Dealloc_T>
inline
Teuchos::RefCountPtr<T>
Teuchos::rcp( T* p, Dealloc_T dealloc, bool owns_mem )
{
  return RefCountPtr<T>(p,dealloc,owns_mem);
}

template<class T2, class T1>
REFCOUNTPTR_INLINE
Teuchos::RefCountPtr<T2>
Teuchos::rcp_implicit_cast(const RefCountPtr<T1>& p1)
{
  T2 *check = p1.get(); // Make the compiler check if the conversion is legal
  RefCountPtr<T2> p2;
  if(p1.access_node()) {
    p2.access_ptr()  = check;
    p2.access_node() = const_cast<RefCountPtr<T1>&>(p1).access_node();
    p2.access_node()->incr_count();
  }
  return p2;
}

template<class T2, class T1>
REFCOUNTPTR_INLINE
Teuchos::RefCountPtr<T2>
Teuchos::rcp_static_cast(const RefCountPtr<T1>& p1)
{
  T2 *check = static_cast<T2*>(p1.get()); // Make the compiler check if the conversion is legal
  RefCountPtr<T2> p2;
  if(p1.access_node()) {
    p2.access_ptr()  = check;
    p2.access_node() = const_cast<RefCountPtr<T1>&>(p1).access_node();
    p2.access_node()->incr_count();
  }
  return p2;
}

template<class T2, class T1>
REFCOUNTPTR_INLINE
Teuchos::RefCountPtr<T2>
Teuchos::rcp_const_cast(const RefCountPtr<T1>& p1)
{
  T2 *check = const_cast<T2*>(p1.get()); // Make the compiler check if the conversion is legal
  RefCountPtr<T2> p2;
  if(p1.access_node()) {
    p2.access_ptr()  = check;
    p2.access_node() = const_cast<RefCountPtr<T1>&>(p1).access_node();
    p2.access_node()->incr_count();
  }
  return p2;
}

template<class T2, class T1>
REFCOUNTPTR_INLINE
Teuchos::RefCountPtr<T2>
Teuchos::rcp_dynamic_cast(const RefCountPtr<T1>& p1)
{
  RefCountPtr<T2> p2; // NULL by default
  if( p1.get() ) {
    T2 *check = dynamic_cast<T2*>(p1.get()); // Make the compiler check if the conversion is legal
    if(check) {
      p2.access_ptr()  = check;
      p2.access_node() = const_cast<RefCountPtr<T1>&>(p1).access_node();
      p2.access_node()->incr_count();
    }
  }
  return p2;
}

template<class T1, class T2>
REFCOUNTPTR_INLINE
void Teuchos::set_extra_data( const T1 &extra_data, const std::string& name, Teuchos::RefCountPtr<T2> *p, bool force_unique )
{
  *(*p); // Assert not NULL
  p->access_node()->set_extra_data( extra_data, name, force_unique );
}

template<class T1, class T2>
REFCOUNTPTR_INLINE
T1& Teuchos::get_extra_data( RefCountPtr<T2>& p, const std::string& name )
{
  *p; // Assert not NULL
  return any_cast<T1>(p.access_node()->get_extra_data(typeid(T1).name(),name));
}

template<class T1, class T2>
REFCOUNTPTR_INLINE
const T1& Teuchos::get_extra_data( const RefCountPtr<T2>& p, const std::string& name )
{
  *p; // Assert not NULL
  return any_cast<T1>(p.access_node()->get_extra_data(typeid(T1).name(),name));
}

template<class Dealloc_T, class T>
REFCOUNTPTR_INLINE
Dealloc_T&
Teuchos::get_dealloc( RefCountPtr<T>& p )
{
  *p; // Assert not NULL
  PrivateUtilityPack::RefCountPtr_node_tmpl<typename Dealloc_T::ptr_t,Dealloc_T>
    *dnode = dynamic_cast<PrivateUtilityPack::RefCountPtr_node_tmpl<typename Dealloc_T::ptr_t,Dealloc_T>*>(p.access_node());
  TEST_FOR_EXCEPTION(
    dnode==NULL, std::logic_error
    ,"get_dealloc<" << typeid(Dealloc_T).name() << "," << typeid(T).name() << ">(p): "
    << "Error, requested type \'" << typeid(PrivateUtilityPack::RefCountPtr_node_tmpl<typename Dealloc_T::ptr_t,Dealloc_T>).name()
    << "\' does not match actual type of the node \'" << typeid(*p.access_node()).name() << "!"
    );
  return dnode->get_dealloc();
}

template<class Dealloc_T, class T>
inline
const Dealloc_T& 
Teuchos::get_dealloc( const Teuchos::RefCountPtr<T>& p )
{
  return get_dealloc<Dealloc_T>(const_cast<RefCountPtr<T>&>(p));
}

#endif  // REFCOUNTPTR_H

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