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GLib Reference Manual | ![]() |
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#include <glib.h> typedef GQuark; GQuark g_quark_from_string (const gchar *string); GQuark g_quark_from_static_string (const gchar *string); const gchar* g_quark_to_string (GQuark quark); GQuark g_quark_try_string (const gchar *string); const gchar* g_intern_string (const gchar *string); const gchar* g_intern_static_string (const gchar *string);
Quarks are associations between strings and integer identifiers. Given either the string or the GQuark identifier it is possible to retrieve the other.
Quarks are used for both Datasets and Keyed Data Lists.
To create a new quark from a string, use g_quark_from_string()
or
g_quark_from_static_string()
.
To find the string corresponding to a given GQuark, use g_quark_to_string()
.
To find the GQuark corresponding to a given string, use g_quark_try_string()
.
Another use for the string pool maintained for the quark functions is string
interning, using g_intern_string()
or g_intern_static_string()
. An interned string
is a canonical representation for a string. One important advantage of interned strings
is that they can be compared for equality by a simple pointer comparision, rather than
using strcmp()
.
typedef guint32 GQuark;
A GQuark is a non-zero integer which uniquely identifies a particular string.
A GQuark value of zero is associated to NULL
.
GQuark g_quark_from_string (const gchar *string);
Gets the GQuark identifying the given string. If the string does not currently have an associated GQuark, a new GQuark is created, using a copy of the string.
GQuark g_quark_from_static_string (const gchar *string);
Gets the GQuark identifying the given (static) string. If the string does not currently have an associated GQuark, a new GQuark is created, linked to the given string.
Note that this function is identical to g_quark_from_string()
except
that if a new GQuark is created the string itself is used rather than
a copy. This saves memory, but can only be used if the string will
always exist. It can be used with statically
allocated strings in the main program, but not with statically
allocated memory in dynamically loaded modules, if you expect to
ever unload the module again (e.g. do not use this function in
GTK+ theme engines).
const gchar* g_quark_to_string (GQuark quark);
Gets the string associated with the given GQuark.
GQuark g_quark_try_string (const gchar *string);
Gets the GQuark associated with the given string, or 0 if string is
NULL
or it has no associated GQuark.
If you want the GQuark to be created if it doesn't already exist, use
g_quark_from_string()
or g_quark_from_static_string()
.
const gchar* g_intern_string (const gchar *string);
Returns a canonical representation for string
. Interned strings can
be compared for equality by comparing the pointers, instead of using strcmp()
.
|
a string |
Returns : |
a canonical representation for the string |
Since 2.10
const gchar* g_intern_static_string (const gchar *string);
Returns a canonical representation for string
. Interned strings can
be compared for equality by comparing the pointers, instead of using strcmp()
.
g_intern_static_string()
does not copy the string, therefore string
must
not be freed or modified.
|
a static string |
Returns : |
a canonical representation for the string |
Since 2.10