---

comstl_enumerator_policies.h

Go to the documentation of this file.

/* 
 * File:        comstl_enumerator_policies.h (originally part of comstl_enum_sequence.h)
 *
 * Purpose:     Policies for enumerator interface handling.
 *
 * Created:     20th December 2003
 * Updated:     11th September 2004
 *
 * Home:        http://stlsoft.org/
 *
 * Copyright (c) 2003-2004, Matthew Wilson and Synesis Software
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name(s) of Matthew Wilson and Synesis Software nor the names of
 *   any contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * 



#ifndef COMSTL_INCL_H_COMSTL_ENUMERATOR_POLICIES
#define COMSTL_INCL_H_COMSTL_ENUMERATOR_POLICIES

#ifndef __STLSOFT_DOCUMENTATION_SKIP_SECTION
# define COMSTL_VER_H_COMSTL_ENUMERATOR_POLICIES_MAJOR      3
# define COMSTL_VER_H_COMSTL_ENUMERATOR_POLICIES_MINOR      0
# define COMSTL_VER_H_COMSTL_ENUMERATOR_POLICIES_REVISION   1
# define COMSTL_VER_H_COMSTL_ENUMERATOR_POLICIES_EDIT       8
#endif /* !__STLSOFT_DOCUMENTATION_SKIP_SECTION */

/* 
 * Includes
 */

#ifndef COMSTL_INCL_H_COMSTL
# include "comstl.h"                    // Include the COMSTL root header
#endif /* !COMSTL_INCL_H_COMSTL */
#ifndef COMSTL_INCL_H_COMSTL_REFCOUNT_FUNCTIONS
# include "comstl_refcount_functions.h" // safe_release, release_set_null
#endif /* !COMSTL_INCL_H_COMSTL_REFCOUNT_FUNCTIONS */
#ifndef STLSOFT_INCL_H_STLSOFT_ITERATOR
# include "stlsoft_iterator.h"
#endif /* !STLSOFT_INCL_H_STLSOFT_ITERATOR */

/* 
 * Namespace
 *
 * The COMSTL components are contained within the comstl namespace. This is
 * actually an alias for stlsoft::comstl_project,
 *
 * The definition matrix is as follows:
 *
 * _STLSOFT_NO_NAMESPACE    _COMSTL_NO_NAMESPACE    comstl definition
 * ---------------------    --------------------    -----------------
 *  not defined              not defined             = stlsoft::comstl_project
 *  not defined              defined                 not defined
 *  defined                  not defined             comstl
 *  defined                  defined                 not defined
 *
 */

#ifndef _COMSTL_NO_NAMESPACE
# if defined(_STLSOFT_NO_NAMESPACE) || \
     defined(__STLSOFT_DOCUMENTATION_SKIP_SECTION)
/* There is no stlsoft namespace, so must define ::comstl */
namespace comstl
{
# else
/* Define stlsoft::comstl_project */

namespace stlsoft
{

namespace comstl_project
{

# endif /* _STLSOFT_NO_NAMESPACE */
#endif /* !_COMSTL_NO_NAMESPACE */

/* 


/* 
 * Classes
 */

template<ss_typename_param_k I>
struct input_cloning_policy
{
public:
    typedef I                                       interface_type;
    typedef comstl_ns_qual_std(input_iterator_tag)  iterator_tag_type;

public:
    static interface_type *clone(interface_type *&src)
    {
        interface_type *ret =   src;

        safe_addref(ret);

        return ret;
    }
};

template<ss_typename_param_k I>
struct forward_cloning_policy
{
public:
    typedef I                                           interface_type;
    typedef comstl_ns_qual_std(forward_iterator_tag)    iterator_tag_type;

public:
    static interface_type *clone(interface_type const *src)
    {
        interface_type  *ret;

        if( src == 0 ||
            FAILED(const_cast<interface_type*>(src)->Clone(&ret)))
        {
            ret = 0;
        }

        return ret;
    }
};

template<ss_typename_param_k I>
struct degenerate_cloning_policy
{
public:
    typedef I                                       interface_type;
    typedef comstl_ns_qual_std(input_iterator_tag)  iterator_tag_type;

public:
    static interface_type *clone(interface_type *&src)
    {
        interface_type  *ret;

        if(src == 0)
        {
            ret = 0;
        }
        else if(FAILED(src->Clone(&ret)))
        {
            ret = src;

            safe_addref(ret);
        }

        return ret;
    }
};

template <ss_typename_param_k P>
struct policy_adaptor
    : public P
{
public:
    typedef ss_typename_type_k P::value_type    value_type;

public:
    struct _init
    {
        void operator ()(value_type &v) const
        {
            P::init(&v);
        }
    };
    struct _copy
    {
        void operator ()(value_type &dest, value_type const &src) const
        {
            P::copy(&dest, &src);
        }
    };
    struct _clear
    {
        void operator ()(value_type &v) const
        {
            P::clear(&v);
        }
    };
};


/* 


/* 

#ifndef _COMSTL_NO_NAMESPACE
# if defined(_STLSOFT_NO_NAMESPACE) || \
     defined(__STLSOFT_DOCUMENTATION_SKIP_SECTION)
} // namespace comstl
# else
} // namespace stlsoft::comstl_project
} // namespace stlsoft
# endif /* _STLSOFT_NO_NAMESPACE */
#endif /* !_COMSTL_NO_NAMESPACE */

/* 

#endif /* !COMSTL_INCL_H_COMSTL_ENUMERATOR_POLICIES */

/* 

STLSoft Libraries documentation © Synesis Software Pty Ltd, 2001-2004