2 files changed, 44 insertions, 0 deletions

diff --git a/aoc/datastructures.py b/aoc/datastructures.py
new file mode 100644
index 0000000..c49f564
--- /dev/null
+++ b/aoc/datastructures.py
@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+from collections import namedtuple
+
+
+class Coordinate(namedtuple("Coordinate", ["x", "y"])):
+    def __sub__(self, other: "Coordinate"):
+        return Coordinate(self.x - other.x, self.y - other.y)
+
+    def __add__(self, other: "Coordinate"):
+        return Coordinate(self.x + other.x, self.y + other.y)
+
+    def manhattan_distance(self, other: "Coordinate"):
+        return abs(self.x - other.x) + abs(self.y - other.y)
+
+    @property
+    def polarity_x(self):
+        try:
+            return abs(self.x) / self.x
+        except ZeroDivisionError:
+            return 0
+
+    @property
+    def polarity_y(self):
+        try:
+            return abs(self.y) / self.y
+        except ZeroDivisionError:
+            return 0
diff --git a/aoc/decorators.py b/aoc/decorators.py
new file mode 100644
index 0000000..a31993a
--- /dev/null
+++ b/aoc/decorators.py
@@ -0,0 +1,17 @@
+# -*- coding: utf-8 -*-
+from functools import wraps
+from typing import Iterator, TypeVar, Callable
+
+T = TypeVar("T")
+
+
+def infinite_generator(func: Callable[[...], Iterator[T]]):
+    @wraps(func)
+    def wrapper(*args, **kwargs):
+        items = list(func(*args, **kwargs))
+
+        while True:
+            for item in items:
+                yield item
+
+    return wrapper