374 lines
12 KiB
C
374 lines
12 KiB
C
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// -*- c++ -*-
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#ifndef _GLIBMM_CONTAINERHANDLE_SHARED_H
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#define _GLIBMM_CONTAINERHANDLE_SHARED_H
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/* $Id: containerhandle_shared.h 322 2006-09-19 20:36:43Z murrayc $ */
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/* Copyright (C) 2002 The gtkmm Development Team
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <cstddef>
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#include <algorithm>
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#include <iterator>
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#include <vector>
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#include <deque>
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#include <list>
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#include <glib-object.h>
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#include <glib/gmem.h>
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#include <glibmm/refptr.h>
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#include <glibmm/ustring.h>
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#include <glibmm/wrap.h>
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#include <glibmm/debug.h>
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#include <glibmmconfig.h>
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GLIBMM_USING_STD(forward_iterator_tag)
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GLIBMM_USING_STD(random_access_iterator_tag)
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GLIBMM_USING_STD(distance)
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GLIBMM_USING_STD(copy)
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GLIBMM_USING_STD(vector)
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GLIBMM_USING_STD(deque)
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GLIBMM_USING_STD(list)
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namespace Glib
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{
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/** @defgroup ContHandles Generic container converters
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*/
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/**
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* @ingroup ContHandles
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*/
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enum OwnershipType
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{
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OWNERSHIP_NONE = 0,
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OWNERSHIP_SHALLOW, //Release the list, but not its elements, when the container is deleted
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OWNERSHIP_DEEP //Release the list, and its elements, when the container is deleted.
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};
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/** Utility class holding an iterator sequence.
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* @ingroup ContHandles
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* This can be used to initialize a Glib container handle (such as
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* Glib::ArrayHandle) with an iterator sequence. Use the helper
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* function Glib::sequence() to create a Sequence<> object.
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*/
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template <class Iterator>
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class Sequence
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{
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private:
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Iterator pbegin_;
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Iterator pend_;
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public:
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Sequence(Iterator pbegin, Iterator pend)
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: pbegin_(pbegin), pend_(pend) {}
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Iterator begin() const { return pbegin_; }
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Iterator end() const { return pend_; }
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size_t size() const { return std::distance(pbegin_, pend_); }
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};
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/** Helper function to create a Glib::Sequence<> object, which
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* in turn can be used to initialize a container handle.
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* @ingroup ContHandles
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*
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* @par Usage example:
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* @code
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* combo.set_popdown_strings(Glib::sequence(foo_begin, foo_end));
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* @endcode
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*/
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template <class Iterator> inline
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Sequence<Iterator> sequence(Iterator pbegin, Iterator pend)
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{
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return Sequence<Iterator>(pbegin, pend);
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}
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namespace Container_Helpers
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{
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/** @defgroup ContHelpers Helper classes
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* @ingroup ContHandles
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*/
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/** Generic TypeTraits implementation.
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* @ingroup ContHelpers
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* This can be used if the C++ type is the same as the C type, or if implicit
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* conversions between the types are available. Also, the types are required
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* to implement copy-by-value semantics. (Ownership is just ignored.)
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*/
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template <class T>
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struct TypeTraits
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{
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typedef T CppType;
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typedef T CType;
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typedef T CTypeNonConst;
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static CType to_c_type (const CppType& item) { return item; }
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static CppType to_cpp_type (const CType& item) { return item; }
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static void release_c_type (const CType&) {}
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};
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#ifndef DOXYGEN_SHOULD_SKIP_THIS /* hide the specializations */
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//For some (proably, more spec-compliant) compilers, these specializations must
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//be next to the objects that they use.
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#ifdef GLIBMM_CAN_USE_DYNAMIC_CAST_IN_UNUSED_TEMPLATE_WITHOUT_DEFINITION
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/** Partial specialization for pointers to GtkObject instances.
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* @ingroup ContHelpers
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*/
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template <class T>
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struct TypeTraits<T*>
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{
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typedef T * CppType;
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typedef typename T::BaseObjectType * CType;
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typedef typename T::BaseObjectType * CTypeNonConst;
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static CType to_c_type (CppType ptr) { return Glib::unwrap(ptr); }
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static CType to_c_type (CType ptr) { return ptr; }
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static CppType to_cpp_type (CType ptr)
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{
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//We copy/paste the widget wrap() implementation here,
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//because we can not use a specific Glib::wrap(T_Impl) overload here,
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//because that would be "dependent", and g++ 3.4 does not allow that.
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//The specific Glib::wrap() overloads don't do anything special anyway.
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GObject* cobj = (GObject*)ptr;
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return dynamic_cast<CppType>(Glib::wrap_auto(cobj, false /* take_copy */));
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}
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static void release_c_type (CType ptr)
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{
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GLIBMM_DEBUG_UNREFERENCE(0, ptr);
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g_object_unref(ptr);
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}
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};
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//This confuse the SUN Forte compiler, so we ifdef it out:
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#ifdef GLIBMM_HAVE_DISAMBIGUOUS_CONST_TEMPLATE_SPECIALIZATIONS
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/** Partial specialization for pointers to const GtkObject instances.
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* @ingroup ContHelpers
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*/
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template <class T>
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struct TypeTraits<const T*>
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{
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typedef const T * CppType;
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typedef const typename T::BaseObjectType * CType;
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typedef typename T::BaseObjectType * CTypeNonConst;
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static CType to_c_type (CppType ptr) { return Glib::unwrap(ptr); }
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static CType to_c_type (CType ptr) { return ptr; }
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static CppType to_cpp_type (CType ptr)
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{
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//We copy/paste the widget wrap() implementation here,
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//because we can not use a specific Glib::wrap(T_Impl) overload here,
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//because that would be "dependent", and g++ 3.4 does not allow that.
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//The specific Glib::wrap() overloads don't do anything special anyway.
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GObject* cobj = (GObject*)const_cast<CTypeNonConst>(ptr);
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return dynamic_cast<CppType>(Glib::wrap_auto(cobj, false /* take_copy */));
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}
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static void release_c_type (CType ptr)
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{
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GLIBMM_DEBUG_UNREFERENCE(0, ptr);
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g_object_unref(const_cast<CTypeNonConst>(ptr));
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}
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};
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#endif //GLIBMM_HAVE_DISAMBIGUOUS_CONST_TEMPLATE_SPECIALIZATIONS
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/** Partial specialization for pointers to GObject instances.
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* @ingroup ContHelpers
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* The C++ type is always a Glib::RefPtr<>.
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*/
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template <class T>
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struct TypeTraits< Glib::RefPtr<T> >
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{
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typedef Glib::RefPtr<T> CppType;
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typedef typename T::BaseObjectType * CType;
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typedef typename T::BaseObjectType * CTypeNonConst;
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static CType to_c_type (const CppType& ptr) { return Glib::unwrap(ptr); }
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static CType to_c_type (CType ptr) { return ptr; }
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static CppType to_cpp_type (CType ptr)
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{
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//return Glib::wrap(ptr, true);
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//We copy/paste the wrap() implementation here,
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//because we can not use a specific Glib::wrap(CType) overload here,
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//because that would be "dependent", and g++ 3.4 does not allow that.
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//The specific Glib::wrap() overloads don't do anything special anyway.
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GObject* cobj = (GObject*)const_cast<CTypeNonConst>(ptr);
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return Glib::RefPtr<T>( dynamic_cast<T*>(Glib::wrap_auto(cobj, true /* take_copy */)) );
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//We use dynamic_cast<> in case of multiple inheritance.
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}
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static void release_c_type (CType ptr)
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{
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GLIBMM_DEBUG_UNREFERENCE(0, ptr);
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g_object_unref(ptr);
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}
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};
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//This confuse the SUN Forte compiler, so we ifdef it out:
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#ifdef GLIBMM_HAVE_DISAMBIGUOUS_CONST_TEMPLATE_SPECIALIZATIONS
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/** Partial specialization for pointers to const GObject instances.
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* @ingroup ContHelpers
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* The C++ type is always a Glib::RefPtr<>.
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*/
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template <class T>
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struct TypeTraits< Glib::RefPtr<const T> >
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{
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typedef Glib::RefPtr<const T> CppType;
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typedef const typename T::BaseObjectType * CType;
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typedef typename T::BaseObjectType * CTypeNonConst;
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static CType to_c_type (const CppType& ptr) { return Glib::unwrap(ptr); }
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static CType to_c_type (CType ptr) { return ptr; }
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static CppType to_cpp_type (CType ptr)
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{
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//return Glib::wrap(ptr, true);
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//We copy/paste the wrap() implementation here,
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//because we can not use a specific Glib::wrap(CType) overload here,
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//because that would be "dependent", and g++ 3.4 does not allow that.
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//The specific Glib::wrap() overloads don't do anything special anyway.
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GObject* cobj = (GObject*)(ptr);
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return Glib::RefPtr<const T>( dynamic_cast<const T*>(Glib::wrap_auto(cobj, true /* take_copy */)) );
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//We use dynamic_cast<> in case of multiple inheritance.
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}
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static void release_c_type (CType ptr)
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{
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GLIBMM_DEBUG_UNREFERENCE(0, ptr);
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g_object_unref(const_cast<CTypeNonConst>(ptr));
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}
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};
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#endif //GLIBMM_HAVE_DISAMBIGUOUS_CONST_TEMPLATE_SPECIALIZATIONS
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#endif //GLIBMM_CAN_USE_DYNAMIC_CAST_IN_UNUSED_TEMPLATE_WITHOUT_DEFINITION
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/** Specialization for UTF-8 strings.
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* @ingroup ContHelpers
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* When converting from C++ to C, Glib::ustring will be accepted as well as
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* std::string and 'const char*'. However, when converting to the C++ side,
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* the output type cannot be 'const char*'.
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*/
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template <>
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struct TypeTraits<Glib::ustring>
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{
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typedef Glib::ustring CppType;
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typedef const char * CType;
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typedef char * CTypeNonConst;
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static CType to_c_type (const Glib::ustring& str) { return str.c_str(); }
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static CType to_c_type (const std::string& str) { return str.c_str(); }
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static CType to_c_type (CType str) { return str; }
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static CppType to_cpp_type(CType str)
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{ return (str) ? Glib::ustring(str) : Glib::ustring(); }
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static void release_c_type(CType str)
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{ g_free(const_cast<CTypeNonConst>(str)); }
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};
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/** Specialization for std::string.
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* @ingroup ContHelpers
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* When converting from C++ to C, std::string will be accepted as well as
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* 'const char*'. However, when converting to the C++ side, the output type
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* cannot be 'const char*'.
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*/
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template <>
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struct TypeTraits<std::string>
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{
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typedef std::string CppType;
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typedef const char * CType;
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typedef char * CTypeNonConst;
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static CType to_c_type (const std::string& str) { return str.c_str(); }
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static CType to_c_type (const Glib::ustring& str) { return str.c_str(); }
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static CType to_c_type (CType str) { return str; }
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static CppType to_cpp_type(CType str)
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{ return (str) ? std::string(str) : std::string(); }
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static void release_c_type(CType str)
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{ g_free(const_cast<CTypeNonConst>(str)); }
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};
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/** Specialization for bool
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* @ingroup ContHelpers
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*/
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template <>
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struct TypeTraits<bool>
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{
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typedef bool CppType;
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typedef gboolean* CType;
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typedef gboolean* CTypeNonConst;
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static CType to_c_type (CppType val) { return (int*)GINT_TO_POINTER(val); }
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static CType to_c_type (CType ptr) { return ptr; }
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static CppType to_cpp_type(CType ptr)
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{
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if(ptr)
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{
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//We use this for gboolean too, because it is actually an int.
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return GPOINTER_TO_INT(ptr);
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}
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else
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return CppType();
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}
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static void release_c_type(CType /* ptr */)
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{
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}
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};
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#endif /* DOXYGEN_SHOULD_SKIP_THIS */
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#ifndef DOXYGEN_SHOULD_SKIP_THIS
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#ifndef GLIBMM_HAVE_TEMPLATE_SEQUENCE_CTORS
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/* The STL containers in Sun's libCstd don't support templated sequence
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* constructors, for "backward compatibility" reasons. This helper function
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* is used in the ContainerHandle -> STL-container conversion workarounds.
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*/
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template <class Cont, class In>
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void fill_container(Cont& container, In pbegin, In pend)
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{
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for(; pbegin != pend; ++pbegin)
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container.push_back(*pbegin);
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}
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#endif /* GLIBMM_HAVE_TEMPLATE_SEQUENCE_CTORS */
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#endif /* DOXYGEN_SHOULD_SKIP_THIS */
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} // namespace Container_Helpers
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} // namespace Glib
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#endif /* _GLIBMM_CONTAINERHANDLE_SHARED_H */
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