The implementation of GValue is not public or documented. When
allocated on the stack, initializing a GValue is usually done as
documented with:
GValue value = { 0, };
There is lot code around (including WebKit) that added all the missing
fields, resulting in this ugly and non-obvious:
GValue value = { 0, { { 0 } } };
However, this doesn't play nice with -Wmissing-field-initializers for
example. Thus, G_VALUE_INIT.
http://bugzilla.gnome.org/show_bug.cgi?id=654793http://bugzilla.gnome.org/show_bug.cgi?id=577231
2008-08-22 Björn Lindqvist <bjourne@gmail.com>
Bug 523939 – Example program for GValue
* gobject/gvalue.c: Add code example that demonstrates GValue's
features.
svn path=/trunk/; revision=7387
2008-06-22 Michael Natterer <mitch@imendio.com>
* *.c: remove trailing whitespace from newly added gtk-doc
comments and reformatted some where they contained overly long or
ill-formatted lines.
svn path=/trunk/; revision=7090
* gobject/gboxed.c:
* gobject/gclosure.c:
* gobject/genums.c:
* gobject/gvalue.c:
Use file-names from the section file for SECTION: comments.
svn path=/trunk/; revision=7072
Mon Oct 2 15:50:16 2006 Tim Janik <timj@gtk.org>
* gvalue.c (g_value_peek_pointer): reverted a change to have an
assert instead of a g_return_val_if_fail() here. libraries (and
programs) should only ever g_assert or g_error if there is no way
to carry on with the current program state. that's clearly not
the case here.
* ChangeLog: added missing changelog entry for 2003-12-30.
2005-03-14 Matthias Clasen <mclasen@redhat.com>
* abicheck.sh: Make work again.
* gsourceclosure.c: Fix a typo.
Make PLT-reduction work with gcc4, and don't include
everything in gobjectalias.h:
* gobject.symbols: Group symbols by header and source
file.
* makegobjectalias.pl: Protect definitions by the same
preprocessor symbols used to guard the headers. Move
the alias declarations to a separate file which is
produced when calling makegalias.pl -def
* Makefile.am (gobjectaliasdef.c): Add a rule to
build this file.
* *.c: Include gobjectalias.h after the other i
GLib headers, include gobjectaliasdef.c at the bottom.
2004-09-16 Matthias Clasen <mclasen@redhat.com>
Implement the same PLT reduction technique used in GTK+:
* Makefile.am: Generate gobjectalias.h from gobject.symbols.
(BUILT_SOURCES): Add gobjectalias.h.
* makegobjectalias.pl: Script to generate gobjectalias.h.
* *.c: Include gobjectalias.h
Wed Dec 17 23:29:17 2003 Matthias Clasen <maclas@gmx.de>
* gvalue.c (g_value_peek_pointer): Use g_assert() instead of
g_return_val_if_fail(), suggested by Sheldon Simms.
Tue Aug 19 04:08:14 2003 Tim Janik <timj@gtk.org>
* gvalue.c: adapt to new gbsearcharray.h code.
(g_value_register_transform_func): turn transform function
replacement into a valid operation.
* gsignal.c: adapt to new gbsearcharray.h code.
* gboxed.c: adapt to new gbsearcharray.h code.
Mon Feb 17 20:59:47 2003 Tim Janik <timj@gtk.org>
* gvalue.c (g_value_register_transform_func): don't assert the types
passed in to have value tables. this prevents dynamic types from
registering transform functions.
2001-12-10 Sven Neumann <sven@gimp.org>
* gobject/gvalue.c (g_value_register_transform_func): perform an exact
match on the two types instead of using transform_func_lookup().
Wed Mar 14 18:46:54 2001 Tim Janik <timj@gtk.org>
* gscanner.[hc]: removed archaic gpointer derived_data; relict and
added a GData member instead.
* glist.[hc]: added g_list_remove_all().
* gslist.[hc]: added g_slist_remove_all().
Sat Mar 17 23:18:36 2001 Tim Janik <timj@gtk.org>
* gobject.c (g_object_get_property): minor bug-fix.
* gbsearcharray.[hc]: provide a macro for static initialization and
functions g_bsearch_array_new() and g_bsearch_array_destroy() for
dynamic allocations.
* gboxed.c: introduce G_TYPE_GSTRING, boxed type for GString.
* gclosure.[hc]: naming corrections.
Fri Mar 9 16:42:08 2001 Tim Janik <timj@gtk.org>
* gvaluetypes.[hc]: moved g_strdup_value_contents() into this file as
a public function (was static in gobject.c before). it's a bit odd
to have that function here, especially since it requires extra includes,
but then it doesn't very well fit somewhere else either.
* gparamspecs.c: added default/max/min checks to param spec creation
functions.
Wed Mar 7 09:36:33 2001 Tim Janik <timj@gtk.org>
* gboxed.[hc]: changed prototype of g_boxed_type_register_static()
to contain an optional init function and a hint at whether the
boxed structure uses ref counting internally.
added g_value_set_boxed_take_ownership().
made G_TYPE_BOXED an abstract value type.
* genums.[hc]: made G_TYPE_ENUM and G_TYPE_FLAGS abstract value
types.
* glib-genmarshal.c: argument type changes, preparation for third-party
arg specification.
* gobject.[hc]: cleaned up get/set property code.
added g_strdup_value_contents() to improve warnings.
* gparam.[hc]: added g_param_value_convert(), taking over responsibility
of the old g_value_convert(). added G_PARAM_LAX_VALIDATION flag so
validation alterations may be valid a part of the property setting
process.
* gparamspecs.[hc]: made value comparisons stable (for sort applications).
added GParamSpecValueArray, a param spec for value arrays and
GParamSpecClosure. nuked the value exchange functions and
GParamSpecCCallback.
* gtype.[hc]: catch unintialized usages of the type system with
g_return_val_if_uninitialized(). introduced G_TYPE_FLAG_VALUE_ABSTRACT
to flag types that introduce a value table, but can't be used for
g_value_init(). cleaned up reserved type ids.
* gvalue.[hc]: code cleanups and saner checking.
nuked the value exchange API. implemented value transformations, we
can't really "convert" values, rather transforms are an anylogy to
C casts, real conversions need a param spec for validation, which is
why g_param_value_convert() does real conversions now.
* gvaluearray.[hc]: new files that implement a GValueArray, a struct
that can hold inhomogeneous arrays of value (to that extend that it
also allowes undefined values, i.e. G_VALUE_TYPE(value)==0).
this is exposed to the type system as a boxed type.
* gvaluetransform.c: new file implementing most of the former value
exchange functions as single-sided transformations.
* gvaluetypes.[hc]: nuked G_TYPE_CCALLBACK, added
g_value_set_string_take_ownership().
* *.h: s/G_IS_VALUE_/G_VALUE_HOLDS_/.
* *.[hc]: many fixes and cleanups.
* many warning improvements.
Tue Feb 27 18:35:15 2001 Tim Janik <timj@gtk.org>
* gobject.c (g_object_get_valist): urg, pass G_VALUE_NOCOPY_CONTENTS
into G_VALUE_LCOPY(), this needs proper documenting.
* gparam.c: fixed G_PARAM_USER_MASK.
* gtype.c (type_data_make_W):
(type_data_last_unref_Wm): fixed invalid memory freeing.
* gobject.c (g_object_last_unref): destroy signal handlers associated
with object, right before finalization.
* gsignal.c (g_signal_parse_name): catch destroyed nodes or signals
that don't actually support details.
* gobject.[hc]: got rid of property trailers. nuked GObject
properties "data" and the "signal" variants.
(g_object_connect): new convenience function to do multiple
signal connections at once.
(g_object_disconnect): likewise, for disconnections.
* gparam.[hc] (g_param_spec_pool_lookup): took out trailer support.
* gvalue.[hc]: marked g_value_fits_pointer() and g_value_peek_pointer()
as private (the latter got renamed from g_value_get_as_pointer()).
Wed Mar 7 09:32:06 2001 Tim Janik <timj@gtk.org>
* glib-object.h: add gvaluearray.h.
* gstring.[hc]: fixup naming of g_string_sprint*.
* gtypes.h: fixed GCompareDataFunc naming.
Wed Mar 7 09:33:27 2001 Tim Janik <timj@gtk.org>
* gobject/Makefile.am: shuffled rules to avoid excessive
rebuilds.
* gobject/gobject-sections.txt: updates.
* gobject/tmpl/*: bunch of updates, added another patch
from Eric Lemings <eric.b.lemings@lmco.com>.
Sat Feb 17 04:55:35 2001 Tim Janik <timj@gtk.org>
* gtype.[hc]: changed collect_format, collect_value() and lcopy_format,
lcopy_value() in the GTypeValueTable. the collect functions are now
called only once per value, collect_format/lcopy_format are strings
that enlist all necessary GTypeCValues to be varargs-collected.
* gvalue.h: ranamed STATIC_TAG to G_VALUE_NOCOPY_CONTENTS to indicate that
a value shouldn't copy its contents.
* gvaluecollector.h: changed G_VALUE_COLLECT() and G_VALUE_LCOPY()
macros to carry an additional argument (flags) that can be used
to pass G_VALUE_NOCOPY_CONTENTS along to the collection functions.
* *.c: adapted collect_value() and lcopy_value() functions to the new
prototypes, support G_VALUE_NOCOPY_CONTENTS where apropriate.
* gsignal.[hc]: introduced a G_SIGNAL_TYPE_STATIC_SCOPE flag that can
be passed along (ORed) with the parameter types, indicating that the
emission arguments are to be considered static for the scope of the
emission. should be used with care and only if the caller knows that
a parameter cannot be destroyed/freed from signal handlers connected
to an emission.
Wed Jan 31 07:14:22 2001 Tim Janik <timj@gtk.org>
* gobject/Makefile.am: adapt to work with new CVS gtk-doc, leaving the old
rules in place caused bogus recursions. main changes:
- add to conditionalized section:
all-local:
$(MAKE) scan
$(MAKE) templates
$(MAKE) sgml
$(MAKE) html.stamp
html.stamp: sgml.stamp $(EXTRA_SGML_FILES)
$(MAKE) html
DOC_STAMPS= html.stamp sgml.stamp
- change:
maintainer-clean-local: clean
- cd $(srcdir) && rm -rf sgml html $(DOC_MODULE)-decl-list.txt $(DOC_MODULE)-decl.txt
+ cd $(srcdir) && rm -rf sgml html $(DOC_MODULE)-decl-list.txt $(DOC_MODULE)-decl.txt $(DOC_STAMPS)
* glib/Makefile.am (maintainer-clean-local): dito.
Wed Jan 31 06:21:32 2001 Tim Janik <timj@gtk.org>
* gobject/tmpl/types.sgml: applied docu patch from Eric Lemings
<eric.b.lemings@lmco.com>, did some more editing.
Wed Jan 31 06:19:49 2001 Tim Janik <timj@gtk.org>
* gparam.h: gtk-doc sucks for not dealing with #define inside enums.
* gtype.[hc]: added G_TYPE_FLAG_RESERVED_ID_BIT, a bit in the type
number that's supposed to be left untouched (preserved mainly
for the signal code).
* *.c: added thread safety code, based on an old patch from sebastian.
the remaining thread safety issues are now datalists on pspecs (to be
solved im gdataset.c) and gvalue.c where locking concerns value exchange
functionality only, and that's soon to be revised.
Mon Dec 11 04:44:11 2000 Tim Janik <timj@gtk.org>
* gboxed.c: fixed dealing with collection/lcopy of NULL values.
* gclosure.h: removed insane ramblings, added G_CALLBACK() a casting
convenience macro.
* Makefile.am: cleanups, marshaller generation rules.
* gmarshal.[hc]: new files with GRuntime standard marshallers.
* glib-genmarshal.c: fix log domain, support gruntime standard
marshallers, suport G_TYPE_PARAM, come with extern "C" and
#include gmarshal.h.
* glib-genmarshal.1: reflect glib-genmarshal.c updates.
* gobject.[hc]: implement object constructor. rework parameter
changed notification queueing, we support queue freezes now and
don't dispatch from an idle handler anymore.
parameter->property rename hassle.
implemented ::properties_changed and ::notify::* signals for
property change notification (the later supports property names
as details). added signal connection and named data properties.
(g_signal_connect_object): new function to setup while_alive
connections.
(g_object_class_install_property): sink properties now, since they
are initially floating.
(g_object_steal_data):
(g_object_set_data_full):
(g_object_set_data):
(g_object_get_data): set/get data by using g_datalist_*() functions
directly.
(g_object_queue_param_changed): nuked.
(g_object_freeze_notify): start queueing of property changes (freeze/
thaw calls stack).
(g_object_notify): announce changes of a certain property directly.
(g_object_thaw_notify): process queue of property changes, therefore
emitting GObject::notify::detail with detail being the changed
properties names.
(G_OBJECT_WARN_INVALID_PROPERTY_ID): saner macro variant of former
G_WARN_INVALID_PARAM_ID().
* gparam.[hc]: param specs are now initially floating and need to be
sunken with g_param_spec_sink(), support G_TYPE_PARAM values.
added G_PARAM_CONSTRUCT and G_PARAM_CONSTRUCT_ONLY parameter flags,
required by GObjectClass.constructor().
* gparamspecs.[hc]: added GParamSpecParam, GParamSpecPointer and
GParamSpecCCallback, param specs for G_TYPE_PARAM, G_TYPE_POINTER
and G_TYPE_CCALLBACK respectively.
* gsignal.[hc]: cleanups.
(signal_id_lookup): after walking the anchestry, try interfaces as well.
(g_signal_new): new function to create signals from varargs type list.
(g_signal_connect_closure): closure connection variant that works from
signal name+detail.
(g_signal_connect_data): c handler connection variant that works from
signal name+detail.
(g_signal_emit_valist): emit signal for an instance with paraneters
collected from a va_list.
(g_signal_emit): emit signal, taking parameters from varargs list.
(g_signal_emit_by_name): same as g_signal_emit, working from
signal name+detail.
(signal_emit_R): return whether return_value needs to be altered.
* gtype.[hc]: set log-domain to GRuntime, i'm slowly getting to all
the points that need to reflect the upcoming rename.
melt g_type_conforms_to() functionality into g_type_is_a(), as that
is what we really want (liskov substitution principle).
assorted changes to other files due to conforms_to->is_a.
* gvalue.[hc]: implemented g_value_set_instance() that sets a value
from an instantiatable type via the value_table's collect_value()
function (based on an idea from James Henstridge <james@daa.com.au>).
cleanups/fixes.
* gvaluetypes.[hc]: implement G_TYPE_CCALLBACK and G_TYPE_PARAM.
2000-10-30 Sebastian Wilhelmi <wilhelmi@ira.uka.de>
* gvalue.c (exchange_entries_equal), gparam.c (param_spec_equals):
made both functions return gboolean just for the little extra
standard conformance now that GEqualFunc is introduced.
Tue Oct 24 22:09:14 2000 Tim Janik <timj@gtk.org>
* glib-object.h: added newly added gobject/ headers.
* gmesage.c: print g_message() output to stderr instead of stdout.
Wed Oct 25 20:27:02 2000 Tim Janik <timj@gtk.org>
* gtype.c (g_type_free_instance): for the moment, freeing object
structures will fill their memory portion with 0xAA. there's a
FIXME there, remove this line at a later point.
Tue Oct 24 23:10:26 2000 Tim Janik <timj@gtk.org>
* glib-genmarshal.1:
* glib-genmarshal.c: added publically installed marshaller generator.
* gtype.h: added G_TYPE_INSTANCE_GET_INTERFACE() to retrive a certain
interface VTable from instances.
Mon Oct 23 08:28:15 2000 Tim Janik <timj@gtk.org>
* gobject.[hc]: new functions for closure maintenance:
(g_object_watch_closure): maintain validity of the object and
the closure for objects that are used as data part of a closure.
(g_cclosure_new_object): convenience function to create C closures
that have an object as data argument.
(g_closure_new_object): convenience function to create closures
that have an object as data argument.
* gclosure.[hc]: implementation of GClosure mechanism.
a closure is basically an encapsulation of a callback function
and its environment. ideally, most places supporting callback
functions will simply take a GClosure* pointer and thus unify
callback environments wrg destroy notification etc.
GClosure provides destroy notifiers for arbitrary data pointers,
reference counting, invalidation notification (it can be invalidated
which is merely a deactivate state) and a marshallinbg abstraction.
GCClosure is also provided in these files, they present a specialized
GClosure implementation for C language callbacks.
* genum.c: macro cleanups.
* gboxed.[hc]: new files, for boxed type abstraction.
(g_boxed_copy): copy a boxed structure
(g_boxed_free): free a boxed structure
(g_value_set_boxed):
(g_value_get_boxed): standard GValue functions for boxed types
(g_boxed_type_register_static): convenience function for easy
introduction of new G_TYPE_BOXED derivatives.
* gparam.[hc]: introduced g_param_type_register_static(), a short hand
for creation of new GParamSpec derived types.
* gtype.[hc]: many fixes, introduced ability to flag individual
type nodes as ABSTRACT upon registration, added value_peek_pointer()
to the value table to peek at GValue contents as a pointer for types
that support this. fixed up GValue checks.
* gvalue.[hc]: added g_value_fits_pointer() and g_value_get_as_pointer()
to peek at the value contents as pointer.
* *.[hc]: adaptions to type macro fixes and changes in the type
registration API.
* many const corrections over the place.
Sat Oct 21 02:49:56 2000 Tim Janik <timj@gtk.org>
* gtype.c (g_type_conforms_to): this function basically behaves like
and is_a check, except that it _additionally_ features interfaces
for instantiatable types. enforce this in the second branch as well
(`type' conforms_to `type') even if `type' is not an interface type.
Fri Oct 20 15:31:04 2000 Tim Janik <timj@gtk.org>
* gvaluetypes.[hc]: added G_TYPE_POINTER implementation from jrb.
* gtype.[hc]:
* gobject.c:
* gvaluetypes.c: added GTypeValueTable.value_peek_pointer and
suitable implementations of this for G_TYPE_STRING, G_TYPE_OBJECT
and G_TYPE_POINTER.
Mon Aug 21 04:13:37 2000 Tim Janik <timj@gtk.org>
* gbsearcharray.[hc]: long standing needed generic implementation
of a binary searchable, sorted and dynamically sized array.
Thu Jun 29 16:02:07 2000 Owen Taylor <otaylor@redhat.com>
* gobject.c:include string.h for memset
* genums.h: include string.h for strcpy
* gvalue.c: include string.h for memset, memcpy.
Fri Jun 23 17:20:26 2000 Tim Janik <timj@gtk.org>
* glib.h: define gstring in terms of gchar*. this typedef reflects
the type name of the primitive G_TYPE_STRING in the gobject module.
Sat Jun 24 23:03:04 2000 Tim Janik <timj@gtk.org>
* gtype.[hc]: provide G_TYPE_CHAR, G_TYPE_UCHAR, G_TYPE_BOOLEAN,
G_TYPE_INT, G_TYPE_UINT, G_TYPE_LONG, G_TYPE_ULONG, G_TYPE_FLOAT,
G_TYPE_DOUBLE and G_TYPE_STRING fundamental types.
added a GTypeValueTable* pointer to GTypeInfo structure for types
to implement GValue handling functions.
GTypeValueTable contains the following members:
value_init(): initialize a GValue structure.
value_free(): free GValue structure contents (optional).
value_copy(): copy one GValue contents to another GValue structure of
collect_type: varargs collection type for the first variable argument
to be collected by collect_value().
collect_value(): variable arguments collection function (optional).
lcopy_type: varargs collection type for the first variable argument
to be location copyied by lcopy_value().
lcopy_value(): variable arguments location copy function (optional).
g_type_value_table_peek(): new function to retrive the GTypeValueTable*
for a type node. ValueTables get inherited from parent types, unless
overridden through the GTypeInfo structure. internally, GTypeValueTable
support means an added overhead of one pointer per static or used
dynamic type node.
g_type_add_class_cache_func(): provide a cache_func/data pair to be
called prior to a type nodes last_unref() function, this can be used
to prevent premature class destruction. multiple installed cache_func()
will be chained upon last_unref() untill one of them returns TRUE.
the cache_func()s have to check the type id passed in to figure whether
they actually wants to cache the class of this type (since any types are
routed through the cache_func() chain).
g_type_remove_class_cache_func(): remove a previously installed
cache_func/data pair. the cache maintained by this function has to be
clear when calling g_type_remove_class_cache_func() to avoid leaks.
g_type_class_unref_uncached(): class unref function for cache_func()
implementations, unreferences a class omitting the cache chain (and
therefore unref->cache->unref->... loops).
* gvaluetypes.[hc]: provide the value setters/getters for the primitive
fundamental types boolean, char, uchar, int, uint, long, ulong, float,
double and string.
* gvalue.[hc]: provide G_TYPE_IS_VALUE() in terms of whether a
GTypeValueTable is provided for this type.
removed g_value_init_default(), g_value_validate(), g_value_defaults(),
g_value_set_default() and g_values_cmp() as these are supplied by the
GParamSpec API now.
moved g_values_exchange() into the "implementation details" section,
since it just provides the underlying functionality for
g_value_convert().
* gvaluecollector.h: renamed the varargs value container from
GParamCValue to GTypeCValue as the value collection methods are
supplied by the type system now.
G_PARAM_COLLECT_VALUE() and G_PARAM_LCOPY_VALUE() got renamed to
G_VALUE_COLLECT() and G_VALUE_LCOPY() and operate without a
GParamSpec structure now.
* genums.h: macros cleanups/fixes.
* genum.c: provide G_TYPE_ENUM and G_TYPE_FLAGS type
and assorted g_value_{s|g}et_{enum|flags}() implementations.
* gobject.[hc]:
provide G_IS_VALUE_OBJECT(), G_TYPE_OBJECT ValueTable methods
and g_value_{s|g}et_object().
* gparam.[hc]: reduced class to value_set_default(),
value_validate() and values_cmp(). also parameters now need to fill
in a GType value_type; field to indicate the GValue type they
are handling. provide g_param_value_set_default(),
g_param_value_defaults(), g_param_value_validate() and
g_param_values_cmp().
* gparamspecs.[hc]: got rid of the g_value_* functions and
the G_IS_VALUE_* macros. adapted param spec implementations
according to the GParamSpecClass changes.
Fri May 5 01:15:48 2000 Tim Janik <timj@gtk.org>
* gtype.h: add reserved fundamental ids for gtk types (for transition
time). added G_TYPE_FUNDAMENTAL_MAX for gtk.
Mon Apr 17 20:45:50 2000 Tim Janik <timj@gtk.org>
* glib-gobject.c (g_object_base_class_finalize): oops, don't unset
n_params prior to destructing them.
Tue Apr 11 04:28:10 2000 Tim Janik <timj@gtk.org>
* fixed a couple of bugs in the initial parameter/object
implementations, after getting beast running on GObject and GValue.
Fri Apr 7 04:27:49 2000 Tim Janik <timj@gtk.org>
* glib-gobject.[hc]: completed parameter set/get implementations,
along with asyncronous parameter changed notification queue.
Sun Apr 2 04:54:36 2000 Tim Janik <timj@gtk.org>
* glib-gobject.[hc]: GObject implementation, that is facilities
for setting/getting quarked data and reference counting.
* glib-gparamspecs.[hc]: first actuall parameter implementations
for GLib, so far we have: char, uchar, bool, int, uint, long,
ulong, enum, flags, float, double, string and object. each of these
GParamSpecs is a new instantiatable type in its own respect,
so the .c file derives 13 new types from G_TYPE_PARAM and
defines over 50 (*2) conversion facilities.
* glib-gvaluecollector.h: generic varargs handling stubs for
GParamSpecs, private header file (does get installed for
inclusion into user code though).
* glib-gvalue.[hc]: GValue functionality implementation.
* glib-gparam.[hc]: basis GParamSpec implementation for
the virtual base type G_TYPE_PARAM.
* glib-genums.[hc]: enum/flags type implementation, based on
bseenum.[hc].
* glib-extra.[hc]: GLib additions, including 1.3 compatibility
routines and various other functions, from string manipulation
over list manipulation up to a unix signal GSource.
* glib-gtype.[hc]: GLib Type System implementation, heavily
based on BSE's dynamic type system.
