1 files changed, 34 insertions, 0 deletions
diff --git a/src/utils/opt.nim b/src/utils/opt.nim
new file mode 100644
index 00000000..21d79af2
--- /dev/null
+++ b/src/utils/opt.nim
@@ -0,0 +1,34 @@
+# Inspired by nim-results.
+
+type
+  Result*[T, E] = object
+    val: T
+    has: bool
+    when not (E is void):
+      ex: E
+
+  Opt*[T] = Result[T, void]
+
+template ok*[T, E](t: type Result[T, E], x: T): Result[T, E] =
+  Result[T, E](val: x, has: true)
+
+template ok*[T](x: T): auto =
+  ok(typeof(result), x)
+
+template ok*[T, E](res: var Result[T, E], x: T): Result[T, E] =
+  res.val = x
+  res.has = true
+
+template err*[T, E](t: type Result[T, E], e: E): Result[T, E] =
+  Result[T, E](ex: e)
+
+template err*[E](e: E): auto =
+  err(typeof(result), e)
+
+template err*[T, E](res: var Result[T, E], e: E) =
+  res.ex = e
+
+template isOk*(res: Result): bool = res.has
+template isErr*(res: Result): bool = not res.has
+template get*[T, E](res: Result[T, E]): T = res.val
+template error*[T, E](res: Result[T, E]): E = res.ex