1 files changed, 8 insertions, 0 deletions
diff --git a/src/iter/utils.rs b/src/iter/utils.rs
new file mode 100644
index 0000000..c168c92
--- /dev/null
+++ b/src/iter/utils.rs
@@ -0,0 +1,8 @@
+pub fn pymod(a: isize, b: isize) -> isize {
+    let r = a % b;
+    // If r and b differ in sign, add b to wrap the result to the correct sign.
+    if (r > 0 && b < 0) || (r < 0 && b > 0) {
+        return r + b;
+    }
+    r
+}
+\ No newline at end of file