GLib Reference Manual | |||
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#include <glib.h> struct GPtrArray; GPtrArray* g_ptr_array_new (void); void g_ptr_array_add (GPtrArray *array, gpointer data); gboolean g_ptr_array_remove (GPtrArray *array, gpointer data); gpointer g_ptr_array_remove_index (GPtrArray *array, guint index); gboolean g_ptr_array_remove_fast (GPtrArray *array, gpointer data); gpointer g_ptr_array_remove_index_fast (GPtrArray *array, guint index); void g_ptr_array_set_size (GPtrArray *array, gint length); #define g_ptr_array_index (array,index) void g_ptr_array_free (GPtrArray *array, gboolean free_seg); |
Pointer Arrays are similar to Arrays but are used only for storing pointers.
Note: If you remove elements from the array, elements at the end of the array are moved into the space previously occupied by the removed element. This means that you should not rely on the index of particular elements remaining the same. You should also be careful when deleting elements while iterating over the array.
To create a pointer array, use g_ptr_array_new().
To add elements to a pointer array, use g_ptr_array_add().
To remove elements from a pointer array, use g_ptr_array_remove(), g_ptr_array_remove_index() or g_ptr_array_remove_index_fast().
To access an element of a pointer array, use g_ptr_array_index().
To set the size of a pointer array, use g_ptr_array_set_size().
To free a pointer array, use g_ptr_array_free().
Example 1. Using a GPtrArray.
GPtrArray *gparray; gchar *string1 = "one", *string2 = "two", *string3 = "three"; gparray = g_ptr_array_new(); g_ptr_array_add (gparray, (gpointer) string1); g_ptr_array_add (gparray, (gpointer) string2); g_ptr_array_add (gparray, (gpointer) string3); if (g_ptr_array_index (gparray, 0) != (gpointer) string1) g_print ("ERROR: got p instead of p\n", g_ptr_array_index (gparray, 0), string1); g_ptr_array_free (gparray, TRUE); |
struct GPtrArray { gpointer *pdata; guint len; }; |
Contains the public fields of a pointer array. The pdata field points to the array of pointers, which may as when the array grows. The len field is the number of pointers in the array.
GPtrArray* g_ptr_array_new (void); |
Creates a new GPtrArray.
Returns : | the new GPtrArray. |
void g_ptr_array_add (GPtrArray *array, gpointer data); |
Adds a pointer to the end of the pointer array. The array will grow in size automatically if necessary.
array : | a GPtrArray. |
data : | the pointer to add. |
gboolean g_ptr_array_remove (GPtrArray *array, gpointer data); |
Removes the first occurrence of the given pointer from the pointer array. The following elements are moved down one place.
It returns TRUE if the pointer was removed, or FALSE if the pointer was not found.
array : | a GPtrArray. |
data : | the pointer to remove. |
Returns : | TRUE if the pointer is removed. FALSE if the pointer is not found in the array. |
gpointer g_ptr_array_remove_index (GPtrArray *array, guint index); |
Removes the pointer at the given index from the pointer array. The following elements are moved down one place.
array : | a GPtrArray. |
index : | the index of the pointer to remove. |
Returns : | the pointer which was removed. |
gboolean g_ptr_array_remove_fast (GPtrArray *array, gpointer data); |
Removes the first occurrence of the given pointer from the pointer array. The last element in the array is used to fill in the space, so this function does not preserve the order of the array. But it is faster than g_ptr_array_remove().
It returns TRUE if the pointer was removed, or FALSE if the pointer was not found.
array : | a GPtrArray. |
data : | the pointer to remove. |
Returns : | TRUE if the pointer was found in the array. |
gpointer g_ptr_array_remove_index_fast (GPtrArray *array, guint index); |
Removes the pointer at the given index from the pointer array. The last element in the array is used to fill in the space, so this function does not preserve the order of the array. But it is faster than g_ptr_array_remove_index().
array : | a GPtrArray. |
index : | the index of the pointer to remove. |
Returns : | the pointer which was removed. |
void g_ptr_array_set_size (GPtrArray *array, gint length); |
Sets the size of the array, expanding it if necessary. New elements are set to NULL.
array : | a GPtrArray. |
length : | the new length of the pointer array. |
#define g_ptr_array_index(array,index) |
Returns the pointer at the given index of the pointer array.
array : | a GPtrArray. |
index : | the index of the pointer to return. |
Returns : | the pointer at the given index. |