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hb-set

hb-set — Objects representing a set of integers

Types and Values

#define HB_SET_VALUE_INVALID
typedef hb_set_t

Includes

#include <hb.h>

Description

Set objects represent a mathematical set of integer values. They are used in non-shaping APIs to query certain sets of characters or glyphs, or other integer values.

Functions

hb_set_add ()

void
hb_set_add (hb_set_t *set,
            hb_codepoint_t codepoint);

Adds codepoint to set .

Parameters

set

A set

 

codepoint

The element to add to set

 

Since: 0.9.2


hb_set_add_range ()

void
hb_set_add_range (hb_set_t *set,
                  hb_codepoint_t first,
                  hb_codepoint_t last);

Adds all of the elements from first to last (inclusive) to set .

Parameters

set

A set

 

first

The first element to add to set

 

last

The final element to add to set

 

Since: 0.9.7


hb_set_allocation_successful ()

hb_bool_t
hb_set_allocation_successful (const hb_set_t *set);

Tests whether memory allocation for a set was successful.

Parameters

set

A set

 

Returns

true if allocation succeeded, false otherwise

Since: 0.9.2


hb_set_clear ()

void
hb_set_clear (hb_set_t *set);

Clears out the contents of a set.

Parameters

set

A set

 

Since: 0.9.2


hb_set_create ()

hb_set_t *
hb_set_create (void);

Creates a new, initially empty set.

[Xconstructor]

Returns

The new hb_set_t.

[transfer full]

Since: 0.9.2


hb_set_del ()

void
hb_set_del (hb_set_t *set,
            hb_codepoint_t codepoint);

Removes codepoint from set .

Parameters

set

A set

 

codepoint

Removes codepoint from set

 

Since: 0.9.2


hb_set_del_range ()

void
hb_set_del_range (hb_set_t *set,
                  hb_codepoint_t first,
                  hb_codepoint_t last);

Removes all of the elements from first to last (inclusive) from set .

Parameters

set

A set

 

first

The first element to remove from set

 

last

The final element to remove from set

 

Since: 0.9.7


hb_set_destroy ()

void
hb_set_destroy (hb_set_t *set);

Decreases the reference count on a set. When the reference count reaches zero, the set is destroyed, freeing all memory.

[skip]

Parameters

set

A set

 

Since: 0.9.2


hb_set_get_empty ()

hb_set_t *
hb_set_get_empty (void);

Fetches the singleton empty hb_set_t.

Returns

The empty hb_set_t.

[transfer full]

Since: 0.9.2


hb_set_get_max ()

hb_codepoint_t
hb_set_get_max (const hb_set_t *set);

Finds the largest element in the set.

Parameters

set

A set

 

Returns

maximum of set , or HB_SET_VALUE_INVALID if set is empty.

Since: 0.9.7


hb_set_get_min ()

hb_codepoint_t
hb_set_get_min (const hb_set_t *set);

Finds the smallest element in the set.

Parameters

set

A set

 

Returns

minimum of set , or HB_SET_VALUE_INVALID if set is empty.

Since: 0.9.7


hb_set_get_population ()

unsigned int
hb_set_get_population (const hb_set_t *set);

Returns the number of elements in the set.

Parameters

set

A set

 

Returns

The population of set

Since: 0.9.7


hb_set_get_user_data ()

void *
hb_set_get_user_data (hb_set_t *set,
                      hb_user_data_key_t *key);

Fetches the user data associated with the specified key, attached to the specified set.

[skip]

Parameters

set

A set

 

key

The user-data key to query

 

Returns

A pointer to the user data.

[transfer none]

Since: 0.9.2


hb_set_has ()

hb_bool_t
hb_set_has (const hb_set_t *set,
            hb_codepoint_t codepoint);

Tests whether codepoint belongs to set .

Parameters

set

A set

 

codepoint

The element to query

 

Returns

true if codepoint is in set , false otherwise

Since: 0.9.2


hb_set_intersect ()

void
hb_set_intersect (hb_set_t *set,
                  const hb_set_t *other);

Makes set the intersection of set and other .

Parameters

set

A set

 

other

Another set

 

Since: 0.9.2


hb_set_is_empty ()

hb_bool_t
hb_set_is_empty (const hb_set_t *set);

Tests whether a set is empty (contains no elements).

Parameters

set

a set.

 

Returns

true if set is empty

Since: 0.9.7


hb_set_is_equal ()

hb_bool_t
hb_set_is_equal (const hb_set_t *set,
                 const hb_set_t *other);

Tests whether set and other are equal (contain the same elements).

Parameters

set

A set

 

other

Another set

 

Returns

TRUE if the two sets are equal, FALSE otherwise.

Since: 0.9.7


hb_set_is_subset ()

hb_bool_t
hb_set_is_subset (const hb_set_t *set,
                  const hb_set_t *larger_set);

Tests whether set is a subset of larger_set .

Parameters

set

A set

 

larger_set

Another set

 

Returns

TRUE if the set is a subset of (or equal to) larger_set , FALSE otherwise.

Since: 1.8.1


hb_set_next ()

hb_bool_t
hb_set_next (const hb_set_t *set,
             hb_codepoint_t *codepoint);

Fetches the next element in set that is greater than current value of codepoint .

Set codepoint to HB_SET_VALUE_INVALID to get started.

Parameters

set

A set

 

codepoint

Input = Code point to query Output = Code point retrieved.

[inout]

Returns

true if there was a next value, false otherwise

Since: 0.9.2


hb_set_next_range ()

hb_bool_t
hb_set_next_range (const hb_set_t *set,
                   hb_codepoint_t *first,
                   hb_codepoint_t *last);

Fetches the next consecutive range of elements in set that are greater than current value of last .

Set last to HB_SET_VALUE_INVALID to get started.

Parameters

set

A set

 

first

The first code point in the range.

[out]

last

Input = The current last code point in the range Output = The last code point in the range.

[inout]

Returns

true if there was a next range, false otherwise

Since: 0.9.7


hb_set_previous ()

hb_bool_t
hb_set_previous (const hb_set_t *set,
                 hb_codepoint_t *codepoint);

Fetches the previous element in set that is lower than current value of codepoint .

Set codepoint to HB_SET_VALUE_INVALID to get started.

Parameters

set

A set

 

codepoint

Input = Code point to query Output = Code point retrieved.

[inout]

Returns

true if there was a previous value, false otherwise

Since: 1.8.0


hb_set_previous_range ()

hb_bool_t
hb_set_previous_range (const hb_set_t *set,
                       hb_codepoint_t *first,
                       hb_codepoint_t *last);

Fetches the previous consecutive range of elements in set that are greater than current value of last .

Set first to HB_SET_VALUE_INVALID to get started.

Parameters

set

A set

 

first

Input = The current first code point in the range Output = The first code point in the range.

[inout]

last

The last code point in the range.

[out]

Returns

true if there was a previous range, false otherwise

Since: 1.8.0


hb_set_reference ()

hb_set_t *
hb_set_reference (hb_set_t *set);

Increases the reference count on a set.

[skip]

Parameters

set

A set

 

Returns

The set.

[transfer full]

Since: 0.9.2


hb_set_set ()

void
hb_set_set (hb_set_t *set,
            const hb_set_t *other);

Makes the contents of set equal to the contents of other .

Parameters

set

A set

 

other

Another set

 

Since: 0.9.2


hb_set_set_user_data ()

hb_bool_t
hb_set_set_user_data (hb_set_t *set,
                      hb_user_data_key_t *key,
                      void *data,
                      hb_destroy_func_t destroy,
                      hb_bool_t replace);

Attaches a user-data key/data pair to the specified set.

[skip]

Parameters

set

A set

 

key

The user-data key to set

 

data

A pointer to the user data to set

 

destroy

A callback to call when data is not needed anymore.

[optional]

replace

Whether to replace an existing data with the same key

 

Returns

true if success, false otherwise

Since: 0.9.2


hb_set_subtract ()

void
hb_set_subtract (hb_set_t *set,
                 const hb_set_t *other);

Subtracts the contents of other from set .

Parameters

set

A set

 

other

Another set

 

Since: 0.9.2


hb_set_symmetric_difference ()

void
hb_set_symmetric_difference (hb_set_t *set,
                             const hb_set_t *other);

Makes set the symmetric difference of set and other .

Parameters

set

A set

 

other

Another set

 

Since: 0.9.2


hb_set_union ()

void
hb_set_union (hb_set_t *set,
              const hb_set_t *other);

Makes set the union of set and other .

Parameters

set

A set

 

other

Another set

 

Since: 0.9.2

Types and Values

HB_SET_VALUE_INVALID

#define HB_SET_VALUE_INVALID ((hb_codepoint_t) -1)

hb_set_t

typedef struct hb_set_t hb_set_t;

Data type for holding a set of integers. hb_set_t's are used to gather and contain glyph IDs, Unicode code points, and various other collections of discrete values.

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