From e70f0b4de81d24d22a29a2af03c669368fce6af2 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@gmail.com>
Date: Sat, 24 Nov 2018 20:38:48 +0100
Subject: wanda: initial commit

---
 src/optional.hpp | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 src/optional.hpp

(limited to 'src/optional.hpp')

diff --git a/src/optional.hpp b/src/optional.hpp
new file mode 100644
index 0000000..c178d59
--- /dev/null
+++ b/src/optional.hpp
@@ -0,0 +1,36 @@
+#ifndef WANDA_OPTIONAL_HPP
+#define WANDA_OPTIONAL_HPP
+
+#include <optional>
+
+namespace wanda::std_ext {
+
+struct failable {
+
+    constexpr static auto success() { return failable{false}; }
+    constexpr static auto failure() { return failable{true}; }
+
+    template<typename Handler>
+    constexpr auto operator ||(Handler handler) const {
+        if(m_failed) {
+            handler();
+        }
+    }
+
+private:
+    constexpr explicit failable(bool failed) : m_failed{failed} { };
+    bool const m_failed;
+};
+
+template<typename ObjectType, typename HandlerType>
+auto with(std::optional<ObjectType> && object, HandlerType handler) {
+  if(object) {
+    handler(object.value());
+    return failable::success();
+  }
+  return failable::failure();
+}
+
+}
+
+#endif
\ No newline at end of file
-- 
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