From b7f5d7565a19efbfebd72f2877444c552e4230c8 Mon Sep 17 00:00:00 2001
From: Aqua-sama <aqua@iserlohn-fortress.net>
Date: Fri, 12 Mar 2021 16:44:02 +0200
Subject: libk: add Result<T, E> class

---
 libk/result.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 libk/result.h

(limited to 'libk/result.h')

diff --git a/libk/result.h b/libk/result.h
new file mode 100644
index 0000000..8077baf
--- /dev/null
+++ b/libk/result.h
@@ -0,0 +1,23 @@
+#pragma once
+#include <types.h>
+
+// TODO T&& constructor
+// TODO T&& Result::take() with consumed semantics
+
+template <typename T, error_enum_t E>
+class Result {
+public:
+  explicit constexpr Result(T t) : is_ok(true), data{.t = t} {};
+  explicit constexpr Result(E e) : is_ok(false), data{.e = e} {};
+
+  constexpr operator bool() const { return is_ok; }
+  constexpr E error() const { return is_ok ? E::NoError : data.e; }
+  constexpr T value() const { return is_ok ? data.t : T{}; }
+
+private:
+  const bool is_ok;
+  union {
+    T t;
+    E e;
+  } data;
+};
-- 
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