Added macros to iterate over matrix

This avoids having to write double for-loops again and again.

- 'matrix_loop' just replaces the loops and gives access to the indices i
and j
- 'matrix_foreach' initializes a double pointer to the current element
- 'matrix_foreach_idx' is combination of the two above

All for-loops that simply iterate over a matrix have been replaced.

1 files changed, 7 insertions, 0 deletions

diff --git a/matrix.h b/matrix.h
index 5ee5dc3..dc09ef6 100644
--- a/matrix.h
+++ b/matrix.h
@@ -4,6 +4,13 @@
 #include <stddef.h>
 
 #define matrix_at(mat, i, j) ((mat)->xs[(i) * (mat)->n + (j)])
+
+#define matrix_loop(mat, i, j) for (size_t i = 0; i < (mat)->m; i++) for (size_t j = 0; j < (mat)->m; j++)
+
+#define matrix_foreach(mat, it) for (double *it = (mat)->xs; it < (mat)->xs + ((mat)->m * (mat)->n); ++it)
+
+#define matrix_foreach_idx(mat, it, i, j) double *it = (mat)->xs; for (size_t i = 0; i < (mat)->m; i++) for (size_t j = 0; j < (mat)->n; j++, ++it)
+
 #define TRUE 1
 #define FALSE 0