xst_member_action.h

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// Common Text Transformation Library
// Copyright (C) 1997-2006 by Igor Kholodov. 
//
// 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.,
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// mailto:cttl@users.sourceforge.net
// http://sourceforge.net/projects/cttl/

// xst_member_action.h

#ifndef _XST_MEMBER_ACTION_H_INCLUDED_
#define _XST_MEMBER_ACTION_H_INCLUDED_

namespace cttl_impl {

template< typename ObjectT, typename MemberActionT, typename ArgumentT, typename ResultT >
class xst_member_action

#ifdef CTTL_TRACE_DEPOSITS
    : public xst_traced_action_base
#endif // CTTL_TRACE_DEPOSITS

{
    xst_storage_adaptor< ObjectT > m_object;

    MemberActionT m_member_action;

    xst_storage_adaptor< ArgumentT > m_argument;

public:
    typedef xst_member_action< ObjectT, MemberActionT, ArgumentT, ResultT > action_T;

    typedef typename MemberActionT::result_type result_T;

    typedef typename xst_dereference_traits< action_T, result_T >::value_type value_type;

    xst_member_action(
#ifdef CTTL_TRACE_DEPOSITS
        int line_,
        char const* action_name_,
#endif // CTTL_TRACE_DEPOSITS
        ObjectT object_ref_,
        MemberActionT member_action_,
        ArgumentT argument_
        )
        :
#ifdef CTTL_TRACE_DEPOSITS
        xst_traced_action_base( line_, action_name_ ),
#endif // CTTL_TRACE_DEPOSITS
        m_object( object_ref_ ),
        m_member_action( member_action_ ),
        m_argument( argument_ )
    {
    }

    result_T operator() ( bool ) const
    {
        return operator*();
    }

    result_T operator* () const
    {
#ifdef CTTL_TRACE_DEPOSITS
        trace_prolog( m_argument.value() );
        result_T result = m_member_action( &m_object.value(), m_argument.value() );
        trace_epilog( result );
        return result;
#else
        return m_member_action( &m_object.value(), m_argument.value() );
#endif // CTTL_TRACE_DEPOSITS
    }

};  // xst_member_action

}   // namespace cttl_impl


#endif //_XST_MEMBER_ACTION_H_INCLUDED_

---