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containerhandle_shared.h

// -*- c++ -*-
#ifndef _GLIBMM_CONTAINERHANDLE_SHARED_H
#define _GLIBMM_CONTAINERHANDLE_SHARED_H

/* $Id: containerhandle_shared.h 4 2005-05-13 20:47:18Z taybin $ */

/* Copyright (C) 2002 The gtkmm Development Team
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <cstddef>
#include <algorithm>
#include <iterator>
#include <vector>
#include <deque>
#include <list>

#include <glib-object.h>
#include <glib/gmem.h>
#include <glibmm/refptr.h>
#include <glibmm/ustring.h>
#include <glibmm/wrap.h>
#include <glibmm/debug.h>

#include <glibmmconfig.h>
GLIBMM_USING_STD(forward_iterator_tag)
GLIBMM_USING_STD(random_access_iterator_tag)
GLIBMM_USING_STD(distance)
GLIBMM_USING_STD(copy)
GLIBMM_USING_STD(vector)
GLIBMM_USING_STD(deque)
GLIBMM_USING_STD(list)


namespace Glib
{

/** @defgroup ContHandles Generic container converters
 */

/**
 * @ingroup ContHandles
 */
enum OwnershipType
{
  OWNERSHIP_NONE = 0,
  OWNERSHIP_SHALLOW, //Release the list, but not its elements, when the container is deleted
  OWNERSHIP_DEEP //Release the list, and its elements, when the container is deleted.
};


/** Utility class holding an iterator sequence.
 * @ingroup ContHandles
 * This can be used to initialize a Glib container handle (such as
 * Glib::ArrayHandle) with an iterator sequence.  Use the helper
 * function Glib::sequence() to create a Sequence<> object.
 */
template <class Iterator>
00072 class Sequence
{
private:
  Iterator pbegin_;
  Iterator pend_;

public:
  Sequence(Iterator pbegin, Iterator pend)
    : pbegin_(pbegin), pend_(pend) {}

  Iterator begin() const { return pbegin_; }
  Iterator end()   const { return pend_;   }
  size_t   size()  const { return std::distance(pbegin_, pend_); }
};

/** Helper function to create a Glib::Sequence<> object, which
 * in turn can be used to initialize a container handle.
 * @ingroup ContHandles
 *
 * @par Usage example:
 * @code
 * combo.set_popdown_strings(Glib::sequence(foo_begin, foo_end));
 * @endcode
 */
template <class Iterator> inline
00097 Sequence<Iterator> sequence(Iterator pbegin, Iterator pend)
{
  return Sequence<Iterator>(pbegin, pend);
}


namespace Container_Helpers
{

/** @defgroup ContHelpers Helper classes
 * @ingroup ContHandles
 */

/** Generic TypeTraits implementation.
 * @ingroup ContHelpers
 * This can be used if the C++ type is the same as the C type, or if implicit
 * conversions between the types are available.  Also, the types are required
 * to implement copy-by-value semantics.  (Ownership is just ignored.)
 */
template <class T>
00117 struct TypeTraits
{
  typedef T CppType;
  typedef T CType;
  typedef T CTypeNonConst;

  static CType   to_c_type      (const CppType& item) { return item; }
  static CppType to_cpp_type    (const CType&   item) { return item; }
  static void    release_c_type (const CType&)        {}
};

#ifndef DOXYGEN_SHOULD_SKIP_THIS /* hide the specializations */

//For some (proably, more spec-compliant) compilers, these specializations must
//be next to the objects that they use.
#ifdef GLIBMM_CAN_USE_DYNAMIC_CAST_IN_UNUSED_TEMPLATE_WITHOUT_DEFINITION

/** Partial specialization for pointers to GtkObject instances.
 * @ingroup ContHelpers
 */
template <class T>
struct TypeTraits<T*>
{
  typedef T *                          CppType;
  typedef typename T::BaseObjectType * CType;
  typedef typename T::BaseObjectType * CTypeNonConst;

  static CType   to_c_type      (CppType ptr) { return Glib::unwrap(ptr);      }
  static CType   to_c_type      (CType   ptr) { return ptr;                    }
  static CppType to_cpp_type    (CType   ptr)
  {
    //We copy/paste the widget wrap() implementation here,
    //because we can not use a specific Glib::wrap(T_Impl) overload here,
    //because that would be "dependent", and g++ 3.4 does not allow that.
    //The specific Glib::wrap() overloads don't do anything special anyway.
    GObject* cobj = (GObject*)ptr;
    return dynamic_cast<CppType>(Glib::wrap_auto(cobj, false /* take_copy */));
  }
  
  static void    release_c_type (CType   ptr)
  {
    GLIBMM_DEBUG_UNREFERENCE(0, ptr);
    g_object_unref(ptr);
  }
};

//This confuse the SUN Forte compiler, so we ifdef it out:
#ifdef GLIBMM_HAVE_DISAMBIGUOUS_CONST_TEMPLATE_SPECIALIZATIONS 

/** Partial specialization for pointers to const GtkObject instances.
 * @ingroup ContHelpers
 */
template <class T>
struct TypeTraits<const T*>
{
  typedef const T *                          CppType;
  typedef const typename T::BaseObjectType * CType;
  typedef typename T::BaseObjectType *       CTypeNonConst;

  static CType   to_c_type      (CppType ptr) { return Glib::unwrap(ptr);      }
  static CType   to_c_type      (CType   ptr) { return ptr;                    }
  static CppType to_cpp_type    (CType   ptr)
  {
     //We copy/paste the widget wrap() implementation here,
     //because we can not use a specific Glib::wrap(T_Impl) overload here,
     //because that would be "dependent", and g++ 3.4 does not allow that.
     //The specific Glib::wrap() overloads don't do anything special anyway.
     GObject* cobj = (GObject*)const_cast<CTypeNonConst>(ptr);
     return dynamic_cast<CppType>(Glib::wrap_auto(cobj, false /* take_copy */));
  }
  
  static void    release_c_type (CType   ptr)
  {
    GLIBMM_DEBUG_UNREFERENCE(0, ptr);
    g_object_unref(const_cast<CTypeNonConst>(ptr));
  }
};
#endif //GLIBMM_HAVE_DISAMBIGUOUS_CONST_TEMPLATE_SPECIALIZATIONS

/** Partial specialization for pointers to GObject instances.
 * @ingroup ContHelpers
 * The C++ type is always a Glib::RefPtr<>.
 */
template <class T>
struct TypeTraits< Glib::RefPtr<T> >
{
  typedef Glib::RefPtr<T>              CppType;
  typedef typename T::BaseObjectType * CType;
  typedef typename T::BaseObjectType * CTypeNonConst;

  static CType   to_c_type      (const CppType& ptr) { return Glib::unwrap(ptr);     }
  static CType   to_c_type      (CType          ptr) { return ptr;                   }
  static CppType to_cpp_type    (CType          ptr)
  {
    //return Glib::wrap(ptr, true);

    //We copy/paste the wrap() implementation here,
    //because we can not use a specific Glib::wrap(CType) overload here,
    //because that would be "dependent", and g++ 3.4 does not allow that.
    //The specific Glib::wrap() overloads don't do anything special anyway.
    GObject* cobj = (GObject*)const_cast<CTypeNonConst>(ptr);
    return Glib::RefPtr<T>( dynamic_cast<T*>(Glib::wrap_auto(cobj, true /* take_copy */)) );
    //We use dynamic_cast<> in case of multiple inheritance.
  }
  
  static void    release_c_type (CType          ptr)
  {
    GLIBMM_DEBUG_UNREFERENCE(0, ptr);
    g_object_unref(ptr);
  }
};

//This confuse the SUN Forte compiler, so we ifdef it out:
#ifdef GLIBMM_HAVE_DISAMBIGUOUS_CONST_TEMPLATE_SPECIALIZATIONS

/** Partial specialization for pointers to const GObject instances.
 * @ingroup ContHelpers
 * The C++ type is always a Glib::RefPtr<>.
 */
template <class T>
struct TypeTraits< Glib::RefPtr<const T> >
{
  typedef Glib::RefPtr<const T>              CppType;
  typedef const typename T::BaseObjectType * CType;
  typedef typename T::BaseObjectType *       CTypeNonConst;

  static CType   to_c_type      (const CppType& ptr) { return Glib::unwrap(ptr);     }
  static CType   to_c_type      (CType          ptr) { return ptr;                   }
  static CppType to_cpp_type    (CType          ptr)
  {
    //return Glib::wrap(ptr, true);

    //We copy/paste the wrap() implementation here,
    //because we can not use a specific Glib::wrap(CType) overload here,
    //because that would be "dependent", and g++ 3.4 does not allow that.
    //The specific Glib::wrap() overloads don't do anything special anyway.
    GObject* cobj = (GObject*)(ptr);
    return Glib::RefPtr<const T>( dynamic_cast<const T*>(Glib::wrap_auto(cobj, true /* take_copy */)) );
    //We use dynamic_cast<> in case of multiple inheritance.
  }
  
  static void    release_c_type (CType          ptr)
  {
    GLIBMM_DEBUG_UNREFERENCE(0, ptr);
    g_object_unref(const_cast<CTypeNonConst>(ptr));
  }
};

#endif //GLIBMM_HAVE_DISAMBIGUOUS_CONST_TEMPLATE_SPECIALIZATIONS

#endif //GLIBMM_CAN_USE_DYNAMIC_CAST_IN_UNUSED_TEMPLATE_WITHOUT_DEFINITION

/** Specialization for UTF-8 strings.
 * @ingroup ContHelpers
 * When converting from C++ to C, Glib::ustring will be accepted as well as
 * std::string and 'const char*'.  However, when converting to the C++ side,
 * the output type cannot be 'const char*'.
 */
template <>
00276 struct TypeTraits<Glib::ustring>
{
  typedef Glib::ustring CppType;
  typedef const char *  CType;
  typedef char *        CTypeNonConst;

  static CType to_c_type (const Glib::ustring& str) { return str.c_str(); }
  static CType to_c_type (const std::string&   str) { return str.c_str(); }
  static CType to_c_type (CType                str) { return str;         }

  static CppType to_cpp_type(CType str)
    { return (str) ? Glib::ustring(str) : Glib::ustring(); }

  static void release_c_type(CType str)
    { g_free(const_cast<CTypeNonConst>(str)); }
};

/** Specialization for std::string.
 * @ingroup ContHelpers
 * When converting from C++ to C, std::string will be accepted as well as
 * 'const char*'.  However, when converting to the C++ side, the output type
 * cannot be 'const char*'.
 */
template <>
00300 struct TypeTraits<std::string>
{
  typedef std::string   CppType;
  typedef const char *  CType;
  typedef char *        CTypeNonConst;

  static CType to_c_type (const std::string&   str) { return str.c_str(); }
  static CType to_c_type (const Glib::ustring& str) { return str.c_str(); }
  static CType to_c_type (CType                str) { return str;         }

  static CppType to_cpp_type(CType str)
    { return (str) ? std::string(str) : std::string(); }

  static void release_c_type(CType str)
    { g_free(const_cast<CTypeNonConst>(str)); }
};

#endif /* DOXYGEN_SHOULD_SKIP_THIS */


#ifndef DOXYGEN_SHOULD_SKIP_THIS
#ifndef GLIBMM_HAVE_TEMPLATE_SEQUENCE_CTORS

/* The STL containers in Sun's libCstd don't support templated sequence
 * constructors, for "backward compatibility" reasons.  This helper function
 * is used in the ContainerHandle -> STL-container conversion workarounds.
 */
template <class Cont, class In>
void fill_container(Cont& container, In pbegin, In pend)
{
  for(; pbegin != pend; ++pbegin)
    container.push_back(*pbegin);
}

#endif /* GLIBMM_HAVE_TEMPLATE_SEQUENCE_CTORS */
#endif /* DOXYGEN_SHOULD_SKIP_THIS */

} // namespace Container_Helpers

} // namespace Glib


#endif /* _GLIBMM_CONTAINERHANDLE_SHARED_H */


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