146 lines
4.6 KiB
C++
146 lines
4.6 KiB
C++
// -*- c++ -*-
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/* $Id: value_custom.cc,v 1.7 2006/04/12 08:12:11 murrayc Exp $ */
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/* Copyright 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 <glibmm/value.h>
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#include <glibmm/utility.h>
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#include <glib.h>
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namespace
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{
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static void warn_already_registered(const char* location, const std::string& full_name)
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{
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g_warning("file %s: (%s): The type name `%s' has been registered already.\n"
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"This is not supposed to happen -- please send a mail with detailed "
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"information about your platform to gtkmm-list@gnome.org. Thanks.\n",
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__FILE__, location, full_name.c_str());
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}
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} // anonymous namespace
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namespace Glib
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{
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GType custom_boxed_type_register(const char* type_name,
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ValueInitFunc init_func,
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ValueFreeFunc free_func,
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ValueCopyFunc copy_func)
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{
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std::string full_name ("glibmm__CustomBoxed_");
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Glib::append_canonical_typename(full_name, type_name);
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// Templates of the same type _might_ be duplicated when instantiated in
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// multiple translation units -- I'm not sure whether this is true. If the
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// static custom_type_ variable in Value<> is duplicated, then the type
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// would be registered more than once.
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//
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// Lookup the type name to see whether this scenario actually happens.
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// If this turns out to be common behaviour on some platform the warning
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// should be removed.
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if(const GType existing_type = g_type_from_name(full_name.c_str()))
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{
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warn_already_registered("Glib::custom_boxed_type_register", full_name);
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return existing_type;
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}
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// Via GTypeValueTable, we can teach GValue how to instantiate,
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// destroy, and copy arbitrary objects of the C++ type.
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const GTypeValueTable value_table =
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{
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init_func,
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free_func,
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copy_func,
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0, // value_peek_pointer
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0, // collect_format
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0, // collect_value
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0, // lcopy_format
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0, // lcopy_value
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};
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const GTypeInfo type_info =
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{
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0, // class_size
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0, // base_init
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0, // base_finalize
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0, // class_init_func
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0, // class_finalize
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0, // class_data
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0, // instance_size
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0, // n_preallocs
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0, // instance_init
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&value_table,
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};
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// Don't use g_boxed_type_register_static(), because that wouldn't allow
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// for a non-NULL default value. The implementation of g_boxed_copy() will
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// use our custom GTypeValueTable automatically.
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return g_type_register_static(G_TYPE_BOXED, full_name.c_str(), &type_info, GTypeFlags(0));
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}
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GType custom_pointer_type_register(const char* type_name)
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{
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std::string full_name ("glibmm__CustomPointer_");
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Glib::append_canonical_typename(full_name, type_name);
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// Templates of the same type _might_ be duplicated when instantiated in
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// multiple translation units -- I'm not sure whether this is true. If the
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// static custom_type variable in Value<>::value_type_() is duplicated, then
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// the type would be registered more than once.
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//
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// Lookup the type name to see whether this scenario actually happens.
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// If this turns out to be common behaviour on some platform the warning
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// should be removed.
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if(const GType existing_type = g_type_from_name(full_name.c_str()))
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{
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warn_already_registered("Glib::custom_pointer_type_register", full_name);
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return existing_type;
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}
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const GTypeInfo type_info =
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{
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0, // class_size
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0, // base_init
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0, // base_finalize
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0, // class_init_func
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0, // class_finalize
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0, // class_data
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0, // instance_size
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0, // n_preallocs
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0, // instance_init
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0, // value_table
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};
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// We could probably use g_pointer_type_register_static(), but I want
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// to keep this function symmetric to custom_boxed_type_register(). Also,
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// g_pointer_type_register_static() would lookup the type name once again.
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return g_type_register_static(G_TYPE_POINTER, full_name.c_str(), &type_info, GTypeFlags(0));
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}
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} // namespace Glib
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