These functions manage sparse matrices.

A sparse matrix stores data objects in cells within a row / column tabular structure, where the majority of cells will be empty. The sparse matrix takes advantage of this emptiness by allocating memory only for non-empty cells and, in this implementation, storing them internally in linked lists.

For more information, you can look at the tutorial_matrixsparse_page.

Functions
Eina_Matrixsparse *	eina_matrixsparse_new (unsigned long rows, unsigned long cols, void(free_func)(void user_data, void cell_data), const void user_data)
	Creates a new Sparse Matrix.
void	eina_matrixsparse_free (Eina_Matrixsparse *m)
	Frees resources allocated for a Sparse Matrix.
void	eina_matrixsparse_size_get (const Eina_Matrixsparse m, unsigned long rows, unsigned long *cols)
	Gets the current size of a Sparse Matrix.
Eina_Bool	eina_matrixsparse_size_set (Eina_Matrixsparse *m, unsigned long rows, unsigned long cols)
	Resizes the Sparse Matrix.
Eina_Bool	eina_matrixsparse_cell_idx_get (const Eina_Matrixsparse m, unsigned long row, unsigned long col, Eina_Matrixsparse_Cell *cell)
	Gets the cell reference inside the Sparse Matrix.
void *	eina_matrixsparse_cell_data_get (const Eina_Matrixsparse_Cell *cell)
	Gets data associated with given cell reference.
void *	eina_matrixsparse_data_idx_get (const Eina_Matrixsparse *m, unsigned long row, unsigned long col)
	Gets data associated with given cell given its indexes.
Eina_Bool	eina_matrixsparse_cell_position_get (const Eina_Matrixsparse_Cell cell, unsigned long row, unsigned long *col)
	Gets the row and column position of the given cell.
Eina_Bool	eina_matrixsparse_cell_data_replace (Eina_Matrixsparse_Cell cell, const void data, void **p_old)
	Changes cell reference value without freeing the possibly existing old value.
Eina_Bool	eina_matrixsparse_cell_data_set (Eina_Matrixsparse_Cell cell, const void data)
	Changes cell value, freeing any previously existing value.
Eina_Bool	eina_matrixsparse_data_idx_replace (Eina_Matrixsparse m, unsigned long row, unsigned long col, const void data, void **p_old)
	Changes cell value at a given row and column position, without freeing previously existing values.
Eina_Bool	eina_matrixsparse_data_idx_set (Eina_Matrixsparse m, unsigned long row, unsigned long col, const void data)
	Changes cell value at a given row and column position, freeing any previously existing value.
Eina_Bool	eina_matrixsparse_row_idx_clear (Eina_Matrixsparse *m, unsigned long row)
	Clears (erases all cells) of a given row number.
Eina_Bool	eina_matrixsparse_column_idx_clear (Eina_Matrixsparse *m, unsigned long col)
	Clears (erases all cells) of column given its index.
Eina_Bool	eina_matrixsparse_cell_idx_clear (Eina_Matrixsparse *m, unsigned long row, unsigned long col)
	Clears (erases) cell at a given row, column position.
Eina_Bool	eina_matrixsparse_cell_clear (Eina_Matrixsparse_Cell *cell)
	Clears (erases) cell given its reference.
Eina_Iterator *	eina_matrixsparse_iterator_new (const Eina_Matrixsparse *m)
	Creates a new iterator over only the existing matrix cells.
Eina_Iterator *	eina_matrixsparse_iterator_complete_new (const Eina_Matrixsparse *m)
	Creates a new iterator over all matrix cells.
Typedefs
typedef struct _Eina_Matrixsparse	Eina_Matrixsparse
typedef struct _Eina_Matrixsparse_Row	Eina_Matrixsparse_Row
typedef struct _Eina_Matrixsparse_Cell	Eina_Matrixsparse_Cell

Typedef Documentation

Eina_Matrixsparse

Type for a generic sparse matrix.

Eina_Matrixsparse_Cell

Type for a generic sparse matrix cell, opaque for users.

Eina_Matrixsparse_Row

Type for a generic sparse matrix row, opaque for users.

Function Documentation

Eina_Bool eina_matrixsparse_cell_clear ( Eina_Matrixsparse_Cell * cell )

Clears (erases) cell given its reference.

Parameters:

[in,out] cell The cell reference; must not be NULL.

Returns:: EINA_TRUE on success, EINA_FALSE on failure.

Warning:: Cells, rows or columns are not reference counted and thus references to freed instances may become invalid.

Note:: This call might also free the column and/or row if this was the last remaining cell contained.

Since :: 2.3

void* eina_matrixsparse_cell_data_get ( const Eina_Matrixsparse_Cell * cell )

Gets data associated with given cell reference.

Parameters:

[in] cell Given cell reference, must not be NULL.

Returns:: Data associated with given cell.

See also:: eina_matrixsparse_cell_idx_get(); eina_matrixsparse_data_idx_get()

Since :: 2.3

Eina_Bool eina_matrixsparse_cell_data_replace	(	Eina_Matrixsparse_Cell *	cell,
		const void *	data,
		void **	p_old
	)

Changes cell reference value without freeing the possibly existing old value.

Parameters:

[in,out]	cell	The cell reference; must not be `NULL`.
[in]	data	New data to set.
[out]	p_old	Returns the old value intact (not freed).

Returns:: EINA_TRUE on success, EINA_FALSE otherwise (cell is NULL).

See also:: eina_matrixsparse_cell_data_set(); eina_matrixsparse_data_idx_replace()

Since :: 2.3

Eina_Bool eina_matrixsparse_cell_data_set	(	Eina_Matrixsparse_Cell *	cell,
		const void *	data
	)

Changes cell value, freeing any previously existing value.

Parameters:

[in,out]	cell	The cell reference; must not be `NULL`.
[in]	data	New data to set.

In contrast to eina_matrixsparse_cell_data_replace(), this function will call free_func() on the existing value, if one exists.

Returns:: EINA_TRUE on success, EINA_FALSE otherwise (cell is NULL).

See also:: eina_matrixsparse_cell_data_replace(); eina_matrixsparse_data_idx_set()

Since :: 2.3

Eina_Bool eina_matrixsparse_cell_idx_clear	(	Eina_Matrixsparse *	m,
		unsigned long	row,
		unsigned long	col
	)

Clears (erases) cell at a given row, column position.

Existing cell will be cleared with the free_func() given to eina_matrixsparse_new().

Parameters:

[in,out]	m	The sparse matrix to operate on.
[in]	row	The row number.
[in]	col	The column number.

Returns:: EINA_TRUE on success, EINA_FALSE on failure (such as requesting a row or column outside the matrix's defined size). It is considered successful if no cell existed at the otherwise valid position.

Warning:: Cells, rows or columns are not reference counted and thus references to freed instances may become invalid.

Note:: This call might also free the column and/or row if this was the last remaining cell contained.

Since :: 2.3

Eina_Bool eina_matrixsparse_cell_idx_get	(	const Eina_Matrixsparse *	m,
		unsigned long	row,
		unsigned long	col,
		Eina_Matrixsparse_Cell **	cell
	)

Gets the cell reference inside the Sparse Matrix.

Parameters:

[in]	m	The sparse matrix.
[in]	row	The new number of row to clear.
[in]	col	The new number of column to clear.
[out]	cell	Pointer to return cell reference, if any exists.

Returns:: 1 on success, 0 on failure. It is considered successful if did not exist but index is inside matrix size, in this case *cell == NULL

See also:: eina_matrixsparse_cell_data_get(); eina_matrixsparse_data_idx_get()

Since :: 2.3

Eina_Bool eina_matrixsparse_cell_position_get	(	const Eina_Matrixsparse_Cell *	cell,
		unsigned long *	row,
		unsigned long *	col
	)

Gets the row and column position of the given cell.

Parameters:

[in]	cell	The cell reference; must not be `NULL`.
[out]	row	The returned row number; may be `NULL`.
[out]	col	The returned column number; may be `NULL`.

Returns:: EINA_TRUE on success, EINA_FALSE otherwise (cell is NULL).

Since :: 2.3

Eina_Bool eina_matrixsparse_column_idx_clear	(	Eina_Matrixsparse *	m,
		unsigned long	col
	)

Clears (erases all cells) of column given its index.

Existing cells will be cleared with free_func() given to eina_matrixsparse_new().

Parameters:

[in,out]	m	The sparse matrix to operate on.
[in]	col	The column number to clear.

Returns:: EINA_TRUE on success, EINA_FALSE on failure (such as requesting a column outside the matrix's defined size). It is considered successful if the column had no cells filled.

Warning:: Cells, rows or columns are not reference counted and thus references to freed instances may become invalid.

Since :: 2.3

void* eina_matrixsparse_data_idx_get	(	const Eina_Matrixsparse *	m,
		unsigned long	row,
		unsigned long	col
	)

Gets data associated with given cell given its indexes.

Parameters:

[in]	m	The sparse matrix to operate on.
[in]	row	The row number.
[in]	col	The column number.

Returns:: Data associated with given cell or NULL if nothing is associated.

See also:: eina_matrixsparse_cell_idx_get(); eina_matrixsparse_cell_data_get()

Since :: 2.3

Eina_Bool eina_matrixsparse_data_idx_replace	(	Eina_Matrixsparse *	m,
		unsigned long	row,
		unsigned long	col,
		const void *	data,
		void **	p_old
	)

Changes cell value at a given row and column position, without freeing previously existing values.

Parameters:

[in,out]	m	The sparse matrix; must not be `NULL`.
[in]	row	The row number.
[in]	col	The column number.
[in]	data	New data to set.
[out]	p_old	The previous value, returned intact (not freed).

Returns:: EINA_TRUE on success, EINA_FALSE otherwise (m is NULL, or row, column indexes are not valid).

See also:: eina_matrixsparse_cell_data_replace(); eina_matrixsparse_data_idx_set()

Since :: 2.3

Eina_Bool eina_matrixsparse_data_idx_set	(	Eina_Matrixsparse *	m,
		unsigned long	row,
		unsigned long	col,
		const void *	data
	)

Changes cell value at a given row and column position, freeing any previously existing value.

Parameters:

[in,out]	m	The sparse matrix, must not be `NULL`.
[in]	row	The row number to set the value.
[in]	col	The column number to set the value.
[in]	data	New data to set.

In contrast to eina_matrixsparse_data_idx_replace(), this function will call free_func() on the existing value, if one exists.

Returns:: EINA_TRUE on success, EINA_FALSE otherwise (m is NULL, indexes are not valid).

See also:: eina_matrixsparse_cell_data_replace()

Since :: 2.3

void eina_matrixsparse_free ( Eina_Matrixsparse * m )

Frees resources allocated for a Sparse Matrix.

Parameters:

[in] m The Sparse Matrix instance to free; must not be NULL.

Since :: 2.3

Eina_Iterator* eina_matrixsparse_iterator_complete_new ( const Eina_Matrixsparse * m )

Creates a new iterator over all matrix cells.

In contrast to eina_matrixsparse_iterator_new(), this routine iterates across all row and column positions in the matrix, returning dummy cells with no data where there are empty holes.

Be aware that since this iterates over all potential elements of a Sparse Matrix, not just the elements with actual data, this can result in a very large number of function calls.

The iterator's data element will be the current cell reference. This cell's position and value can be retrieved with eina_matrixsparse_cell_position_get() and eina_matrixsparse_cell_data_get(). If the cell is empty then the reference will be a dummy/placeholder, thus setting value with eina_matrixsparse_cell_data_set() will leave the pointer unreferenced.

Parameters:

[in] m The Sparse Matrix reference; must not be NULL.

Returns:: A new iterator.

Warning:: If the matrix structure changes then the iterator becomes invalid! That is, if you add or remove cells this iterator behavior is undefined and your program may crash!

Since :: 2.3

Eina_Iterator* eina_matrixsparse_iterator_new ( const Eina_Matrixsparse * m )

Creates a new iterator over only the existing matrix cells.

This is a quick walk over the defined cells; the holes in the Sparse Matrix are skipped over, thus the returned entries will not have consecutive index numbers.

The iterator's data element will be the current cell reference. This cell's position and value can be retrieved with eina_matrixsparse_cell_position_get() and eina_matrixsparse_cell_data_get().

Parameters:

[in] m The Sparse Matrix reference; must not be NULL.

Returns:: A new iterator.

Warning:: If the matrix structure changes then the iterator becomes invalid! That is, if you add or remove cells this iterator behavior is undefined and your program may crash!

Since :: 2.3

Eina_Matrixsparse* eina_matrixsparse_new	(	unsigned long	rows,
		unsigned long	cols,
		void()(void user_data, void *cell_data)	free_func,
		const void *	user_data
	)

Creates a new Sparse Matrix.

Parameters:

[in]	rows	Number of rows in matrix. Operations with rows greater than this value will fail.
[in]	cols	Number of columns in matrix. Operations with columns greater than this value will fail.
[in]	free_func	Used to delete cell data contents, used by eina_matrixsparse_free(), eina_matrixsparse_size_set(), eina_matrixsparse_row_idx_clear(), eina_matrixsparse_column_idx_clear(), eina_matrixsparse_cell_idx_clear() and possible others.
[in]	user_data	Given to free_func as first parameter.

Returns:: Newly allocated matrix, or NULL if allocation failed.

Since :: 2.3

Eina_Bool eina_matrixsparse_row_idx_clear	(	Eina_Matrixsparse *	m,
		unsigned long	row
	)

Clears (erases all cells) of a given row number.

Parameters:

[in,out]	m	The sparse matrix to operate on.
[in]	row	The row number to clear.

Existing cells will be cleared with free_func() given to eina_matrixsparse_new().

Returns:: EINA_TRUE on success, EINA_FALSE on failure (such as requesting a row outside the matrix's defined size). It is considered successful if the row had no cells filled.

Warning:: Cells, rows or columns are not reference counted and thus references to freed instances may become invalid.

Since :: 2.3

void eina_matrixsparse_size_get	(	const Eina_Matrixsparse *	m,
		unsigned long *	rows,
		unsigned long *	cols
	)

Gets the current size of a Sparse Matrix.

The given parameters are guaranteed to be set if they're not NULL, even if this function fails (i.e.: m is not a valid matrix instance).

Parameters:

[in]	m	The sparse matrix to operate on.
[out]	rows	Returns the number of rows; may be `NULL`. If m is invalid, returned value is zero, otherwise it's a positive integer.
[out]	cols	Returns the number of columns; may be `NULL`. If m is invalid, returned value is zero, otherwise it's a positive integer.

Since :: 2.3

Eina_Bool eina_matrixsparse_size_set	(	Eina_Matrixsparse *	m,
		unsigned long	rows,
		unsigned long	cols
	)

Resizes the Sparse Matrix.

This will resize the sparse matrix, potentially freeing cells on rows and columns that will no longer exist.

Parameters:

[in,out]	m	The sparse matrix to operate on.
[in]	rows	The new number of rows; must be greater than zero.
[in]	cols	The new number of columns; must be greater than zero.

Returns:: EINA_TRUE on success, EINA_FALSE on failure.

Warning:: Cells, rows or columns are not reference counted and thus references to freed instances may become invalid.

Since :: 2.3

Functions

Typedefs

Typedef Documentation

Function Documentation