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// -*- C++ -*-
//=============================================================================
/**
* @file get_arg.h
*
* $Id$
*
* Thru-POA/skeleton argument selection function templates.
* @par
* These function templates are used to choose between arguments
* supplied in thru-POA collocated invocations and arguments in
* uncollocated invocations.
*
* @note A function template approach is used to avoid complicated
* argument conversions between stub supplied arguments and
* skeleton supplied ones. For example, it is possible to make
* argument selection more transparent by taking advantage of
* run-time polymorphism. However, that approach would incur
* additional footprint overhead on the client side due to the
* introduction of virtual tables, etc.
*
* @author Ossama Othman
*/
//=============================================================================
#ifndef TAO_GET_ARG_H
#define TAO_GET_ARG_H
#include /**/ "ace/pre.h"
#include "tao/operation_details.h"
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
namespace TAO
{
namespace Portable_Server
{
/// Get return value/argument.
/**
* @note It is possible to determine the return argument type
* using typedef traits found in the TAO::SArg_Traits<>
* template. However, MSVC++ 6 does not support them
* properly. Until we drop MSVC++ 6 support, we'll have to
* pass the return argument type in an additional template
* parameter.
*
* @todo Drop second template parameter, and replace
* " @c RET_ARG_TYPE " return type with
* " @c typename TAO::SArg_Traits<T>::ret_arg_type ".
*/
template<typename T, typename RET_ARG_TYPE>
RET_ARG_TYPE
get_ret_arg (TAO_Operation_Details const * details,
TAO::Argument * const * skel_args)
{
return
details
? static_cast<typename TAO::Arg_Traits<T>::ret_val *> (
details->args ()[0])->arg ()
: static_cast<typename TAO::SArg_Traits<T>::ret_val *> (
skel_args[0])->arg ();
}
/// Get "in" argument.
/**
* @see @c get_ret_arg note to understand why we currently use a
* second template parameter.
*
* @todo Drop second template parameter, and replace
* " @c IN_ARG_TYPE " return type with
* " @c typename TAO::SArg_Traits<T>::in_arg_type ".
*/
template<typename T, typename IN_ARG_TYPE>
IN_ARG_TYPE
get_in_arg (TAO_Operation_Details const * details,
TAO::Argument * const * skel_args,
size_t i)
{
return
(details != 0 && details->args () != 0)
? static_cast<typename TAO::Arg_Traits<T>::in_arg_val *> (
details->args ()[i])->arg ()
: static_cast<typename TAO::SArg_Traits<T>::in_arg_val *> (
skel_args[i])->arg ();
}
/// Get "inout" argument.
/**
* @see @c get_ret_arg note to understand why we currently use a
* second template parameter.
*
* @todo Drop second template parameter, and replace
* " @c INOUT_ARG_TYPE " return type with
* " @c typename TAO::SArg_Traits<T>::inout_arg_type ".
*/
template<typename T, typename INOUT_ARG_TYPE>
INOUT_ARG_TYPE
get_inout_arg (TAO_Operation_Details const * details,
TAO::Argument * const * skel_args,
size_t i)
{
return
details
? static_cast<typename TAO::Arg_Traits<T>::inout_arg_val *> (
details->args ()[i])->arg ()
: static_cast<typename TAO::SArg_Traits<T>::inout_arg_val *> (
skel_args[i])->arg ();
}
/// Get "out" argument.
/**
* @see @c get_ret_arg note to understand why we currently use a
* second template parameter.
*
* @todo Drop second template parameter, and replace
* " @c OUT_ARG_TYPE " return type with
* " @c typename TAO::SArg_Traits<T>::out_arg_type ".
*/
template<typename T, typename OUT_ARG_TYPE>
OUT_ARG_TYPE
get_out_arg (TAO_Operation_Details const * details,
TAO::Argument * const * skel_args,
size_t i)
{
return
details
? static_cast<typename TAO::Arg_Traits<T>::out_arg_val *> (
details->args ()[i])->arg ()
: static_cast<typename TAO::SArg_Traits<T>::out_arg_val *> (
skel_args[i])->arg ();
}
}
}
TAO_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /* TAO_GET_ARG_H*/
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