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// -*- C++ -*-
//=============================================================================
/**
* @file Servant_var.h
*
* @author Jody Hagins <jody@atdesk.com>
* @author Carlos O'Ryan <coryan@atdesk.com>
*/
//=============================================================================
#ifndef TAO_PORTABLESERVER_SERVANT_VAR_H
#define TAO_PORTABLESERVER_SERVANT_VAR_H
#include /**/ "ace/pre.h"
#include "ace/config-all.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "tao/orbconf.h"
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
namespace PortableServer
{
/**
* @class Servant_var
*
* @brief Provides a type safe counted reference to servants.
*
* @author Jody Hagins
*
* @todo Life would be much easier if _add_ref() and _remove_ref() had
* throw specs of "noexcept", that can be hidden in static
* methods though.
*/
template<class T>
class Servant_var
{
public:
typedef T servant_type;
/// Constructor. Assumes ownership of @c p.
Servant_var (T * p = 0);
/// Copy constructor. Adds reference to @c rhs.
Servant_var (Servant_var<T> const & rhs);
/// Assignment operator. Adds reference to @c rhs.
Servant_var<T> & operator= (Servant_var<T> const & rhs);
/// Destructor. Removes a reference from the underlying object,
/// possibly destroying it.
/**
* This destructor doesn't throw exceptions.
*/
~Servant_var ();
/// Assignment operator. Assumes ownership of @c p.
Servant_var<T> & operator= (T * p);
/// Smart pointer operator-> provides access to the underlying object.
T * operator->() const;
/// Dereference the underlying object.
T const & operator*() const;
/// Dereference the underlying object.
T & operator*();
/// Return a void pointer to the underlying object. This allows
/// it to be used in conditional code and tested against 0.
operator void const * () const;
/// As an IN parameter.
T * in() const;
/// As an INOUT parameter.
T *& inout();
/// As an OUT parameter.
T *& out();
/// Return a pointer to the underlying object, and this counted
/// reference will no longer own the object.
T * _retn();
/// Increment the reference count and return the servant.
/**
* It is safe to pass in a null pointer, the pointer is simply
* returned in that case.
*
* @todo We might want to catch all (potential) exceptions in
* _add_ref().
*
* @todo It might be useful to add a _release() method that handles
* any potential exceptions...
*/
static T * _duplicate (T *);
/// Swap the contents of a Servant_var<T> with another
/// Servant_var<T>
/**
* Non-throwing swap operation.
* Often used to implement strong exception safety.
*/
void swap (Servant_var<T> & rhs);
private:
T * ptr_;
};
/// Compare two Servant_vars for equivalence.
template <class X, class Y>
bool operator==(Servant_var<X> const & x, Servant_var<Y> const & y);
/// Compare two Servant_vars for non-equivalence.
template <class X, class Y>
bool operator!=(Servant_var<X> const & x, Servant_var<Y> const & y);
} // namespace PortableServer
TAO_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
# include "tao/PortableServer/Servant_var.inl"
#endif /* __ACE_INLINE__ */
#include "tao/PortableServer/Servant_var.cpp"
#include /**/ "ace/post.h"
#endif /* TAO_PORTABLESERVER_SERVANT_VAR_H */
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