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<title>Caches: GLib Reference Manual</title>
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Top |
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Description
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![Home](home.png)
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![Up](up.png)
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![Prev](left.png)
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![Next](right.png)
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Caches
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Caches — caches allow sharing of complex data structures
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to save resources
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Functions
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GCache *
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g_cache_new ()
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gpointer
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g_cache_insert ()
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void
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g_cache_remove ()
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void
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g_cache_destroy ()
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void
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g_cache_key_foreach ()
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void
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g_cache_value_foreach ()
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void
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(*GCacheDestroyFunc) ()
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gpointer
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(*GCacheDupFunc) ()
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gpointer
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(*GCacheNewFunc) ()
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Types and Values
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GCache
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Includes
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#include <gmodule.h>
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Description
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A GCache allows sharing of complex data structures, in order to
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save system resources.
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GCache uses keys and values. A GCache key describes the properties
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of a particular resource. A GCache value is the actual resource.
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GCache has been marked as deprecated, since this API is rarely
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used and not very actively maintained.
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Functions
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g_cache_new ()
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GCache *
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g_cache_new (GCacheNewFunc value_new_func ,
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GCacheDestroyFunc value_destroy_func ,
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GCacheDupFunc key_dup_func ,
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GCacheDestroyFunc key_destroy_func ,
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GHashFunc hash_key_func ,
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GHashFunc hash_value_func ,
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GEqualFunc key_equal_func );
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g_cache_new has been deprecated since version 2.32 and should not be used in newly-written code.
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Use a GHashTable instead
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Creates a new GCache.
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Parameters
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value_new_func
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a function to create a new object given a key.
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This is called by g_cache_insert() if an object
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with the given key does not already exist
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value_destroy_func
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a function to destroy an object. It is called
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by g_cache_remove() when the object is no
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longer needed (i.e. its reference count drops
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to 0)
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key_dup_func
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a function to copy a key. It is called by
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g_cache_insert() if the key does not already exist in
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the GCache
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key_destroy_func
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a function to destroy a key. It is called by
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g_cache_remove() when the object is no longer
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needed (i.e. its reference count drops to 0)
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hash_key_func
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a function to create a hash value from a key
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hash_value_func
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a function to create a hash value from a value
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key_equal_func
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a function to compare two keys. It should return
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TRUE if the two keys are equivalent
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Returns
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a new GCache
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g_cache_insert ()
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gpointer
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g_cache_insert (GCache *cache ,
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gpointer key );
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g_cache_insert has been deprecated since version 2.32 and should not be used in newly-written code.
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Use a GHashTable instead
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Gets the value corresponding to the given key, creating it if
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necessary. It first checks if the value already exists in the
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GCache, by using the key_equal_func
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function passed to
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g_cache_new() . If it does already exist it is returned, and its
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reference count is increased by one. If the value does not currently
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exist, if is created by calling the value_new_func
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. The key is
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duplicated by calling key_dup_func
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and the duplicated key and value
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are inserted into the GCache.
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Parameters
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cache
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a GCache
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key
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a key describing a GCache object
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Returns
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a pointer to a GCache value
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g_cache_remove ()
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void
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g_cache_remove (GCache *cache ,
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gconstpointer value );
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g_cache_remove has been deprecated since version 2.32 and should not be used in newly-written code.
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Use a GHashTable instead
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Decreases the reference count of the given value. If it drops to 0
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then the value and its corresponding key are destroyed, using the
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value_destroy_func
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and key_destroy_func
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passed to g_cache_new() .
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Parameters
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cache
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a GCache
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value
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the value to remove
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g_cache_destroy ()
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void
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g_cache_destroy (GCache *cache );
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g_cache_destroy has been deprecated since version 2.32 and should not be used in newly-written code.
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Use a GHashTable instead
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Frees the memory allocated for the GCache.
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Note that it does not destroy the keys and values which were
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contained in the GCache.
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Parameters
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cache
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a GCache
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g_cache_key_foreach ()
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void
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g_cache_key_foreach (GCache *cache ,
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GHFunc func ,
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gpointer user_data );
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g_cache_key_foreach has been deprecated since version 2.32 and should not be used in newly-written code.
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Use a GHashTable instead
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Calls the given function for each of the keys in the GCache.
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NOTE func
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is passed three parameters, the value and key of a cache
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entry and the user_data
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. The order of value and key is different
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from the order in which g_hash_table_foreach() passes key-value
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pairs to its callback function !
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Parameters
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cache
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a GCache
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func
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the function to call with each GCache key
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user_data
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user data to pass to the function
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g_cache_value_foreach ()
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void
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g_cache_value_foreach (GCache *cache ,
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GHFunc func ,
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gpointer user_data );
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g_cache_value_foreach has been deprecated since version 2.10 and should not be used in newly-written code.
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The reason is that it passes pointers to internal
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data structures to func
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; use g_cache_key_foreach() instead
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Calls the given function for each of the values in the GCache.
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Parameters
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cache
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a GCache
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func
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the function to call with each GCache value
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user_data
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user data to pass to the function
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GCacheDestroyFunc ()
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void
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(*GCacheDestroyFunc) (gpointer value );
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GCacheDestroyFunc is deprecated and should not be used in newly-written code.
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Specifies the type of the value_destroy_func
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and key_destroy_func
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functions passed to g_cache_new() . The functions are passed a
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pointer to the GCache key or GCache value and should free any
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memory and other resources associated with it.
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Parameters
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value
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the GCache value to destroy
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GCacheDupFunc ()
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gpointer
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(*GCacheDupFunc) (gpointer value );
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GCacheDupFunc is deprecated and should not be used in newly-written code.
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Specifies the type of the key_dup_func
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function passed to
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g_cache_new() . The function is passed a key
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(__not__ a value as the prototype implies) and
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should return a duplicate of the key.
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Parameters
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value
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the GCache key to destroy (__not__ a
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GCache value as it seems)
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Returns
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a copy of the GCache key
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GCacheNewFunc ()
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gpointer
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(*GCacheNewFunc) (gpointer key );
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GCacheNewFunc is deprecated and should not be used in newly-written code.
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Specifies the type of the value_new_func
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function passed to
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g_cache_new() . It is passed a GCache key and should create the
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value corresponding to the key.
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Parameters
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key
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a GCache key
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Returns
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a new GCache value corresponding to the key.
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Types and Values
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GCache
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typedef struct _GCache GCache;
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GCache has been deprecated since version 2.32 and should not be used in newly-written code.
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Use a GHashTable instead
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The GCache struct is an opaque data structure containing
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information about a GCache. It should only be accessed via the
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following functions.
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Generated by GTK-Doc V1.27
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</body>
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</html>
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