BLI_utildefines_iter.h File Reference

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Macros
#define	BLI_FOREACH_SPARSE_RANGE(src, dst, i)

Detailed Description

General looping helpers, use BLI_FOREACH prefix.

Definition in file BLI_utildefines_iter.h.

Macro Definition Documentation

BLI_FOREACH_SPARSE_RANGE

#define BLI_FOREACH_SPARSE_RANGE	(		src,
			dst,
			i )

Value:

  for (int _src = (src), \
           _src2 = _src * 2, \
           _dst2 = (dst) * 2, \
           _error = _dst2 - _src, \
           i = 0, \
           _delta; \
       ((void)(_delta = divide_floor_i(_error, _dst2)), (void)(i -= _delta), (i < _src)); \
       _error -= (_delta * _dst2) + _src2)

Even value distribution.

src must be larger than dst, dst defines the number of iterations, their values are evenly spaced.

The following pairs represent (src, dst) arguments and the values they loop over.

(19, 4) ->    [2, 7, 11. 16]
(100, 5) ->   [9, 29, 49, 69, 89]
(100, 3) ->   [16, 49, 83]
(100, 100) -> [0..99]

Note

this is mainly useful for numbers that might not divide evenly into each other.

Definition at line 28 of file BLI_utildefines_iter.h.

Referenced by BM_edgeloop_expand().