author | William Roberts <williamr@symbian.org> |
Fri, 11 Jun 2010 16:28:56 +0100 | |
branch | GCC_SURGE |
changeset 32 | 2d6a1d6b6e59 |
parent 18 | 47c74d1534e1 |
permissions | -rw-r--r-- |
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/* GObject - GLib Type, Object, Parameter and Signal Library |
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* Copyright (C) 2000-2001 Red Hat, Inc. |
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* Copyright (C) 2005 Imendio AB |
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* Portions copyright (c) 2006-2009 Nokia Corporation. All rights reserved. |
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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 Lesser 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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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General |
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* Public License along with this library; if not, write to the |
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
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* Boston, MA 02111-1307, USA. |
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*/ |
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#if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION) |
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#error "Only <glib-object.h> can be included directly." |
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#endif |
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|
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#ifndef __G_CLOSURE_H__ |
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#define __G_CLOSURE_H__ |
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#include <gobject/gtype.h> |
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G_BEGIN_DECLS |
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/* --- defines --- */ |
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/** |
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* G_CLOSURE_NEEDS_MARSHAL: |
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* @closure: a #GClosure |
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* |
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* Check if the closure still needs a marshaller. See g_closure_set_marshal(). |
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* |
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* Returns: %TRUE if a #GClosureMarshal marshaller has not yet been set on |
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* @closure. |
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*/ |
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#define G_CLOSURE_NEEDS_MARSHAL(closure) (((GClosure*) (closure))->marshal == NULL) |
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/** |
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* G_CLOSURE_N_NOTIFIERS: |
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* @cl: a #GClosure |
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* |
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* Get the total number of notifiers connected with the closure @cl. |
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* The count includes the meta marshaller, the finalize and invalidate notifiers |
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* and the marshal guards. Note that each guard counts as two notifiers. |
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* See g_closure_set_meta_marshal(), g_closure_add_finalize_notifier(), |
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* g_closure_add_invalidate_notifier() and g_closure_add_marshal_guards(). |
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* |
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* Returns: number of notifiers |
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*/ |
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#define G_CLOSURE_N_NOTIFIERS(cl) ((cl)->meta_marshal + ((cl)->n_guards << 1L) + \ |
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(cl)->n_fnotifiers + (cl)->n_inotifiers) |
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/** |
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* G_CCLOSURE_SWAP_DATA: |
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* @cclosure: a #GCClosure |
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* |
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* Checks whether the user data of the #GCClosure should be passed as the |
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* first parameter to the callback. See g_cclosure_new_swap(). |
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* |
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* Returns: %TRUE if data has to be swapped. |
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*/ |
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#define G_CCLOSURE_SWAP_DATA(cclosure) (((GClosure*) (cclosure))->derivative_flag) |
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/** |
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* G_CALLBACK: |
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* @f: a function pointer. |
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* |
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* Cast a function pointer to a #GCallback. |
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*/ |
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#define G_CALLBACK(f) ((GCallback) (f)) |
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/* -- typedefs --- */ |
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typedef struct _GClosure GClosure; |
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typedef struct _GClosureNotifyData GClosureNotifyData; |
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/** |
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* GCallback: |
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* |
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* The type used for callback functions in structure definitions and function |
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* signatures. This doesn't mean that all callback functions must take no |
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* parameters and return void. The required signature of a callback function |
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* is determined by the context in which is used (e.g. the signal to which it |
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* is connected). Use G_CALLBACK() to cast the callback function to a #GCallback. |
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*/ |
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typedef void (*GCallback) (void); |
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/** |
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* GClosureNotify: |
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* @data: data specified when registering the notification callback |
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* @closure: the #GClosure on which the notification is emitted |
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* |
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* The type used for the various notification callbacks which can be registered |
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* on closures. |
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*/ |
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typedef void (*GClosureNotify) (gpointer data, |
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GClosure *closure); |
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/** |
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* GClosureMarshal: |
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* @closure: the #GClosure to which the marshaller belongs |
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* @return_value: a #GValue to store the return value. May be %NULL if the |
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* callback of @closure doesn't return a value. |
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* @n_param_values: the length of the @param_values array |
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* @param_values: an array of #GValue<!-- -->s holding the arguments on |
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* which to invoke the callback of @closure |
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* @invocation_hint: the invocation hint given as the last argument |
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* to g_closure_invoke() |
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* @marshal_data: additional data specified when registering the marshaller, |
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* see g_closure_set_marshal() and g_closure_set_meta_marshal() |
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* |
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* The type used for marshaller functions. |
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*/ |
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typedef void (*GClosureMarshal) (GClosure *closure, |
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GValue *return_value, |
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guint n_param_values, |
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const GValue *param_values, |
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gpointer invocation_hint, |
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gpointer marshal_data); |
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/** |
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* GCClosure: |
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* @closure: the #GClosure |
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* @callback: the callback function |
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* |
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* A #GCClosure is a specialization of #GClosure for C function callbacks. |
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*/ |
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typedef struct _GCClosure GCClosure; |
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129 |
|
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130 |
|
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/* --- structures --- */ |
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struct _GClosureNotifyData |
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{ |
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gpointer data; |
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GClosureNotify notify; |
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}; |
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/** |
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* GClosure: |
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* @in_marshal: Indicates whether the closure is currently being invoked with |
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* g_closure_invoke() |
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* @is_invalid: Indicates whether the closure has been invalidated by |
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* g_closure_invalidate() |
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* |
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* A #GClosure represents a callback supplied by the programmer. |
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*/ |
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struct _GClosure |
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{ |
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/*< private >*/ |
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volatile guint ref_count : 15; |
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volatile guint meta_marshal : 1; |
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volatile guint n_guards : 1; |
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volatile guint n_fnotifiers : 2; /* finalization notifiers */ |
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volatile guint n_inotifiers : 8; /* invalidation notifiers */ |
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volatile guint in_inotify : 1; |
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volatile guint floating : 1; |
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/*< protected >*/ |
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volatile guint derivative_flag : 1; |
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/*< public >*/ |
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volatile guint in_marshal : 1; |
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volatile guint is_invalid : 1; |
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161 |
|
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/*< private >*/ void (*marshal) (GClosure *closure, |
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GValue /*out*/ *return_value, |
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guint n_param_values, |
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const GValue *param_values, |
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gpointer invocation_hint, |
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gpointer marshal_data); |
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/*< protected >*/ gpointer data; |
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169 |
|
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/*< private >*/ GClosureNotifyData *notifiers; |
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171 |
|
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/* invariants/constrains: |
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* - ->marshal and ->data are _invalid_ as soon as ->is_invalid==TRUE |
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* - invocation of all inotifiers occours prior to fnotifiers |
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* - order of inotifiers is random |
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* inotifiers may _not_ free/invalidate parameter values (e.g. ->data) |
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* - order of fnotifiers is random |
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* - each notifier may only be removed before or during its invocation |
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* - reference counting may only happen prior to fnotify invocation |
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* (in that sense, fnotifiers are really finalization handlers) |
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*/ |
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}; |
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/* closure for C function calls, callback() is the user function |
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*/ |
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struct _GCClosure |
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{ |
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GClosure closure; |
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gpointer callback; |
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}; |
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|
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191 |
|
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/* --- prototypes --- */ |
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IMPORT_C GClosure* g_cclosure_new (GCallback callback_func, |
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gpointer user_data, |
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GClosureNotify destroy_data); |
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IMPORT_C GClosure* g_cclosure_new_swap (GCallback callback_func, |
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gpointer user_data, |
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GClosureNotify destroy_data); |
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IMPORT_C GClosure* g_signal_type_cclosure_new (GType itype, |
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guint struct_offset); |
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|
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|
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/* --- prototypes --- */ |
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IMPORT_C GClosure* g_closure_ref (GClosure *closure); |
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IMPORT_C void g_closure_sink (GClosure *closure); |
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IMPORT_C void g_closure_unref (GClosure *closure); |
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/* intimidating */ |
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IMPORT_C GClosure* g_closure_new_simple (guint sizeof_closure, |
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gpointer data); |
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IMPORT_C void g_closure_add_finalize_notifier (GClosure *closure, |
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gpointer notify_data, |
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GClosureNotify notify_func); |
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IMPORT_C void g_closure_remove_finalize_notifier (GClosure *closure, |
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gpointer notify_data, |
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GClosureNotify notify_func); |
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IMPORT_C void g_closure_add_invalidate_notifier (GClosure *closure, |
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gpointer notify_data, |
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GClosureNotify notify_func); |
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IMPORT_C void g_closure_remove_invalidate_notifier (GClosure *closure, |
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gpointer notify_data, |
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GClosureNotify notify_func); |
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IMPORT_C void g_closure_add_marshal_guards (GClosure *closure, |
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gpointer pre_marshal_data, |
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GClosureNotify pre_marshal_notify, |
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gpointer post_marshal_data, |
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GClosureNotify post_marshal_notify); |
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IMPORT_C void g_closure_set_marshal (GClosure *closure, |
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GClosureMarshal marshal); |
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IMPORT_C void g_closure_set_meta_marshal (GClosure *closure, |
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gpointer marshal_data, |
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GClosureMarshal meta_marshal); |
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IMPORT_C void g_closure_invalidate (GClosure *closure); |
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IMPORT_C void g_closure_invoke (GClosure *closure, |
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GValue /*out*/ *return_value, |
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guint n_param_values, |
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const GValue *param_values, |
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gpointer invocation_hint); |
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|
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/* FIXME: |
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OK: data_object::destroy -> closure_invalidate(); |
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MIS: closure_invalidate() -> disconnect(closure); |
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MIS: disconnect(closure) -> (unlink) closure_unref(); |
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OK: closure_finalize() -> g_free (data_string); |
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|
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random remarks: |
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- need marshaller repo with decent aliasing to base types |
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- provide marshaller collection, virtually covering anything out there |
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*/ |
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|
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G_END_DECLS |
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|
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#endif /* __G_CLOSURE_H__ */ |