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GLib Reference Manual | |
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#include <glib.h>
GSequence;
typedef GSequenceIter;
gint (*GSequenceIterCompareFunc) (GSequenceIter *a,
GSequenceIter *b,
gpointer data);
GSequence * g_sequence_new (GDestroyNotify data_destroy);
void g_sequence_free (GSequence *seq);
gint g_sequence_get_length (GSequence *seq);
void g_sequence_foreach (GSequence *seq,
GFunc func,
gpointer user_data);
void g_sequence_foreach_range (GSequenceIter *begin,
GSequenceIter *end,
GFunc func,
gpointer user_data);
void g_sequence_sort (GSequence *seq,
GCompareDataFunc cmp_func,
gpointer cmp_data);
void g_sequence_sort_iter (GSequence *seq,
GSequenceIterCompareFunc cmp_func,
gpointer cmp_data);
GSequenceIter * g_sequence_get_begin_iter (GSequence *seq);
GSequenceIter * g_sequence_get_end_iter (GSequence *seq);
GSequenceIter * g_sequence_get_iter_at_pos (GSequence *seq,
gint pos);
GSequenceIter * g_sequence_append (GSequence *seq,
gpointer data);
GSequenceIter * g_sequence_prepend (GSequence *seq,
gpointer data);
GSequenceIter * g_sequence_insert_before (GSequenceIter *iter,
gpointer data);
void g_sequence_move (GSequenceIter *src,
GSequenceIter *dest);
void g_sequence_swap (GSequenceIter *a,
GSequenceIter *b);
GSequenceIter * g_sequence_insert_sorted (GSequence *seq,
gpointer data,
GCompareDataFunc cmp_func,
gpointer cmp_data);
GSequenceIter * g_sequence_insert_sorted_iter (GSequence *seq,
gpointer data,
GSequenceIterCompareFunc iter_cmp,
gpointer cmp_data);
void g_sequence_sort_changed (GSequenceIter *iter,
GCompareDataFunc cmp_func,
gpointer cmp_data);
void g_sequence_sort_changed_iter (GSequenceIter *iter,
GSequenceIterCompareFunc iter_cmp,
gpointer cmp_data);
void g_sequence_remove (GSequenceIter *iter);
void g_sequence_remove_range (GSequenceIter *begin,
GSequenceIter *end);
void g_sequence_move_range (GSequenceIter *dest,
GSequenceIter *begin,
GSequenceIter *end);
GSequenceIter * g_sequence_search (GSequence *seq,
gpointer data,
GCompareDataFunc cmp_func,
gpointer cmp_data);
GSequenceIter * g_sequence_search_iter (GSequence *seq,
gpointer data,
GSequenceIterCompareFunc iter_cmp,
gpointer cmp_data);
gpointer g_sequence_get (GSequenceIter *iter);
void g_sequence_set (GSequenceIter *iter,
gpointer data);
gboolean g_sequence_iter_is_begin (GSequenceIter *iter);
gboolean g_sequence_iter_is_end (GSequenceIter *iter);
GSequenceIter * g_sequence_iter_next (GSequenceIter *iter);
GSequenceIter * g_sequence_iter_prev (GSequenceIter *iter);
gint g_sequence_iter_get_position (GSequenceIter *iter);
GSequenceIter * g_sequence_iter_move (GSequenceIter *iter,
gint delta);
GSequence * g_sequence_iter_get_sequence (GSequenceIter *iter);
gint g_sequence_iter_compare (GSequenceIter *a,
GSequenceIter *b);
GSequenceIter * g_sequence_range_get_midpoint (GSequenceIter *begin,
GSequenceIter *end);
The GSequence data structure has the API of a list, but is implemented internally with a balanced binary tree. This means that it is possible to maintain a sorted list of n elements in time O(n log n). The data contained in each element can be either integer values, by using of the Type Conversion Macros, or simply pointers to any type of data.
A GSequence is accessed through iterators, represented by a GSequenceIter. An iterator represents a position between two elements of the sequence. For example, the begin iterator represents the gap immediately before the first element of the sequence, and the end iterator represents the gap immediately after the last element. In an empty sequence, the begin and end iterators are the same.
Some methods on GSequence operate on ranges of items. For example
g_sequence_foreach_range() will call a user-specified function on each
element with the given range. The range is delimited by the gaps
represented by the passed-in iterators, so if you pass in the begin
and end iterators, the range in question is the entire sequence.
The function g_sequence_get() is used with an iterator to access the
element immediately following the gap that the iterator
represents. The iterator is said to point to
that element.
Iterators are stable across most operations on a GSequence. For
example an iterator pointing to some element of a sequence will
continue to point to that element even after the sequence is
sorted. Even moving an element to another sequence using for example
g_sequence_move_range() will not invalidate the iterators pointing to
it. The only operation that will invalidate an iterator is when the
element it points to is removed from any sequence.
typedef struct _GSequence GSequence;
The GSequence struct is an opaque data type representing a Sequence data type.
typedef struct _GSequenceNode GSequenceIter;
The GSequenceIter struct is an opaque data type representing an iterator pointing into a GSequence.
gint (*GSequenceIterCompareFunc) (GSequenceIter *a,GSequenceIter *b,gpointer data);
A GSequenceIterCompareFunc is a function used to compare
iterators. It must return zero if the iterators compare equal, a
negative value if a comes before b, and a positive value if b comes
before a.
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a GSequenceIter |
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a GSequenceIter |
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user data |
Returns : |
zero if the iterators are equal, a negative value if a
comes before b, and a positive value if b comes before a. |
GSequence * g_sequence_new (GDestroyNotify data_destroy);
Creates a new GSequence. The data_destroy function, if non-NULL will
be called on all items when the sequence is destroyed and on items that
are removed from the sequence.
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a GDestroyNotify function, or NULL
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Returns : |
a new GSequence |
Since 2.14
void g_sequence_free (GSequence *seq);
Frees the memory allocated for seq. If seq has a data destroy
function associated with it, that function is called on all items in
seq.
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a GSequence |
Since 2.14
gint g_sequence_get_length (GSequence *seq);
Returns the length of seq
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a GSequence |
Returns : |
the length of seq
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Since 2.14
void g_sequence_foreach (GSequence *seq,GFunc func,gpointer user_data);
Calls func for each item in the sequence passing user_data
to the function.
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a GSequence |
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the function to call for each item in seq
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user data passed to func
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Since 2.14
void g_sequence_foreach_range (GSequenceIter *begin,GSequenceIter *end,GFunc func,gpointer user_data);
Calls func for each item in the range (begin, end) passing
user_data to the function.
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a GSequenceIter |
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a GSequenceIter |
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a GFunc |
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user data passed to func
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Since 2.14
void g_sequence_sort (GSequence *seq,GCompareDataFunc cmp_func,gpointer cmp_data);
Sorts seq using cmp_func.
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a GSequence |
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the GCompareDataFunc used to sort seq. This function is
passed two items of seq and should return 0 if they are equal,
a negative value fi the first comes before the second, and a
positive value if the second comes before the first. |
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user data passed to cmp_func
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Since 2.14
void g_sequence_sort_iter (GSequence *seq,GSequenceIterCompareFunc cmp_func,gpointer cmp_data);
Like g_sequence_sort(), but uses a GSequenceIterCompareFunc instead
of a GCompareDataFunc as the compare function
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a GSequence |
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the GSequenceItercompare used to compare iterators in the
sequence. It is called with two iterators pointing into seq. It should
return 0 if the iterators are equal, a negative value if the first
iterator comes before the second, and a positive value if the second
iterator comes before the first. |
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user data passed to cmp_func
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Since 2.14
GSequenceIter * g_sequence_get_begin_iter (GSequence *seq);
Returns the begin iterator for seq.
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a GSequence |
Returns : |
the begin iterator for seq. |
Since 2.14
GSequenceIter * g_sequence_get_end_iter (GSequence *seq);
Returns the end iterator for seg
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a GSequence |
Returns : |
the end iterator for seq
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Since 2.14
GSequenceIter * g_sequence_get_iter_at_pos (GSequence *seq,gint pos);
Returns the iterator at position pos. If pos is negative or larger
than the number of items in seq, the end iterator is returned.
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a GSequence |
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a position in seq, or -1 for the end. |
Returns : |
The GSequenceIter at position pos
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Since 2.14
GSequenceIter * g_sequence_append (GSequence *seq,gpointer data);
Adds a new item to the end of seq.
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a GSequencePointer |
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the data for the new item |
Returns : |
an iterator pointing to the new item |
Since 2.14
GSequenceIter * g_sequence_prepend (GSequence *seq,gpointer data);
Adds a new item to the front of seq
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a GSequence |
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the data for the new item |
Returns : |
an iterator pointing to the new item |
Since 2.14
GSequenceIter * g_sequence_insert_before (GSequenceIter *iter,gpointer data);
Inserts a new item just before the item pointed to by iter.
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a GSequenceIter |
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the data for the new item |
Returns : |
an iterator pointing to the new item |
Since 2.14
void g_sequence_move (GSequenceIter *src,GSequenceIter *dest);
Moves the item pointed to by src to the position indicated by dest.
After calling this function dest will point to the position immediately
after src. It is allowed for src and dest to point into different
sequences.
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a GSequenceIter pointing to the item to move |
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a GSequenceIter pointing to the position to which the item is moved. |
Since 2.14
void g_sequence_swap (GSequenceIter *a,GSequenceIter *b);
Swaps the items pointed to by a and b. It is allowed for a and b
to point into difference sequences.
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a GSequenceIter |
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a GSequenceIter |
Since 2.14
GSequenceIter * g_sequence_insert_sorted (GSequence *seq,gpointer data,GCompareDataFunc cmp_func,gpointer cmp_data);
Inserts data into sequence using func to determine the new position.
The sequence must already be sorted according to cmp_func; otherwise the
new position of data is undefined.
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a GSequence |
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the data to insert |
|
the GCompareDataFunc used to compare items in the sequence. It
is called with two items of the seq and user_data. It should
return 0 if the items are equal, a negative value if the first
item comes before the second, and a positive value if the second
item comes before the first. |
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user data passed to cmp_func. |
Returns : |
a GSequenceIter pointing to the new item. |
Since 2.14
GSequenceIter * g_sequence_insert_sorted_iter (GSequence *seq,gpointer data,GSequenceIterCompareFunc iter_cmp,gpointer cmp_data);
Like g_sequence_insert_sorted(), but uses
a GSequenceIterCompareFunc instead of a GCompareDataFunc as
the compare function.
|
a GSequence |
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data for the new item |
|
the GSequenceItercompare used to compare iterators in the
sequence. It is called with two iterators pointing into seq. It should
return 0 if the iterators are equal, a negative value if the first
iterator comes before the second, and a positive value if the second
iterator comes before the first. |
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user data passed to cmp_func
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Returns : |
a GSequenceIter pointing to the new item |
Since 2.14
void g_sequence_sort_changed (GSequenceIter *iter,GCompareDataFunc cmp_func,gpointer cmp_data);
Moves the data pointed to a new position as indicated by cmp_func. This
function should be called for items in a sequence already sorted according
to cmp_func whenever some aspect of an item changes so that cmp_func
may return different values for that item.
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A GSequenceIter |
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the GCompareDataFunc used to compare items in the sequence. It
is called with two items of the seq and user_data. It should
return 0 if the items are equal, a negative value if the first
item comes before the second, and a positive value if the second
item comes before the first. |
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user data passed to cmp_func. |
Since 2.14
void g_sequence_sort_changed_iter (GSequenceIter *iter,GSequenceIterCompareFunc iter_cmp,gpointer cmp_data);
Like g_sequence_sort_changed(), but uses
a GSequenceIterCompareFunc instead of a GCompareDataFunc as
the compare function.
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a GSequenceIter |
|
the GSequenceItercompare used to compare iterators in the
sequence. It is called with two iterators pointing into seq. It should
return 0 if the iterators are equal, a negative value if the first
iterator comes before the second, and a positive value if the second
iterator comes before the first. |
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user data passed to cmp_func
|
Since 2.14
void g_sequence_remove (GSequenceIter *iter);
Removes the item pointed to by iter. It is an error to pass the
end iterator to this function.
If the sequnce has a data destroy function associated with it, this function is called on the data for the removed item.
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a GSequenceIter |
Since 2.14
void g_sequence_remove_range (GSequenceIter *begin,GSequenceIter *end);
Removes all items in the (begin, end) range.
If the sequence has a data destroy function associated with it, this function is called on the data for the removed items.
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a GSequenceIter |
|
a GSequenceIter |
Since 2.14
void g_sequence_move_range (GSequenceIter *dest,GSequenceIter *begin,GSequenceIter *end);
Inserts the (begin, end) range at the destination pointed to by ptr.
The begin and end iters must point into the same sequence. It is
allowed for dest to point to a different sequence than the one pointed
into by begin and end.
If dest is NULL, the range indicated by begin and end is
removed from the sequence. If dest iter points to a place within
the (begin, end) range, the range does not move.
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a GSequenceIter |
|
a GSequenceIter |
|
a GSequenceIter |
Since 2.14
GSequenceIter * g_sequence_search (GSequence *seq,gpointer data,GCompareDataFunc cmp_func,gpointer cmp_data);
Returns an iterator pointing to the position where data would
be inserted according to cmp_func and cmp_data.
|
a GSequence |
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data for the new item |
|
the GCompareDataFunc used to compare items in the sequence. It
is called with two items of the seq and user_data. It should
return 0 if the items are equal, a negative value if the first
item comes before the second, and a positive value if the second
item comes before the first. |
|
user data passed to cmp_func. |
Returns : |
an GSequenceIter pointing to the position where data
would have been inserted according to cmp_func and cmp_data. |
Since 2.14
GSequenceIter * g_sequence_search_iter (GSequence *seq,gpointer data,GSequenceIterCompareFunc iter_cmp,gpointer cmp_data);
Like g_sequence_search(), but uses
a GSequenceIterCompareFunc instead of a GCompareDataFunc as
the compare function.
|
a GSequence |
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data for the new item |
|
the GSequenceIterCompare function used to compare iterators
in the sequence. It is called with two iterators pointing into seq.
It should return 0 if the iterators are equal, a negative value if the
first iterator comes before the second, and a positive value if the
second iterator comes before the first. |
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user data passed to iter_cmp
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Returns : |
a GSequenceIter pointing to the position in seq
where data would have been inserted according to iter_cmp and cmp_data. |
Since 2.14
gpointer g_sequence_get (GSequenceIter *iter);
Returns the data that iter points to.
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a GSequenceIter |
Returns : |
the data that iter points to |
Since 2.14
void g_sequence_set (GSequenceIter *iter,gpointer data);
Changes the data for the item pointed to by iter to be data. If
the sequence has a data destroy function associated with it, that
function is called on the existing data that iter pointed to.
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a GSequenceIter |
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new data for the item |
Since 2.14
gboolean g_sequence_iter_is_begin (GSequenceIter *iter);
Returns whether iter is the begin iterator
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a GSequenceIter |
Returns : |
whether iter is the begin iterator |
Since 2.14
gboolean g_sequence_iter_is_end (GSequenceIter *iter);
Returns whether iter is the end iterator
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a GSequenceIter |
Returns : |
Whether iter is the end iterator. |
Since 2.14
GSequenceIter * g_sequence_iter_next (GSequenceIter *iter);
Returns an iterator pointing to the next position after iter. If
iter is the end iterator, the end iterator is returned.
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a GSequenceIter |
Returns : |
a GSequenceIter pointing to the next position after iter. |
Since 2.14
GSequenceIter * g_sequence_iter_prev (GSequenceIter *iter);
Returns an iterator pointing to the previous position before iter. If
iter is the begin iterator, the begin iterator is returned.
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a GSequenceIter |
Returns : |
a GSequenceIter pointing to the previous position before
iter. |
Since 2.14
gint g_sequence_iter_get_position (GSequenceIter *iter);
Returns the position of iter
|
a GSequenceIter |
Returns : |
the position of iter
|
Since 2.14
GSequenceIter * g_sequence_iter_move (GSequenceIter *iter,gint delta);
Returns the GSequenceIter which is delta positions away from iter.
If iter is closer than -delta positions to the beginning of the sequence,
the begin iterator is returned. If iter is closer than delta positions
to the end of the sequence, the end iterator is returned.
|
a GSequenceIter |
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A positive or negative number indicating how many positions away
from iter the returned GSequenceIter will be. |
Returns : |
a GSequenceIter which is delta positions away from iter. |
Since 2.14
GSequence * g_sequence_iter_get_sequence (GSequenceIter *iter);
Returns the GSequence that iter points into.
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a GSequenceIter |
Returns : |
the GSequence that iter points into. |
Since 2.14
gint g_sequence_iter_compare (GSequenceIter *a,GSequenceIter *b);
Returns a negative number if a comes before b, 0 if they are equal,
and a positive number if a comes after b.
The a and b iterators must point into the same sequence.
|
a GSequenceIter |
|
a GSequenceIter |
Returns : |
A negative number if a comes before b, 0 if they are
equal, and a positive number if a comes after b. |
Since 2.14
GSequenceIter * g_sequence_range_get_midpoint (GSequenceIter *begin,GSequenceIter *end);
Finds an iterator somewhere in the range (begin, end). This
iterator will be close to the middle of the range, but is not
guaranteed to be exactly in the middle.
The begin and end iterators must both point to the same sequence and
begin must come before or be equal to end in the sequence.
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a GSequenceIter |
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a GSequenceIter |
Returns : |
A GSequenceIter pointing somewhere in the
(begin, end) range. |
Since 2.14