From 9ac56c50f16cf884eefb0f3477e657b455ad14f8 Mon Sep 17 00:00:00 2001
From: Eugen Wissner <belka@caraus.de>
Date: Sun, 23 Sep 2018 06:58:26 +0200
Subject: [PATCH] typecons: Add option constructor function

---
 source/tanya/typecons.d | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/source/tanya/typecons.d b/source/tanya/typecons.d
index db1abfa..52fcbb2 100644
--- a/source/tanya/typecons.d
+++ b/source/tanya/typecons.d
@@ -178,6 +178,8 @@ template tuple(Names...)
  *
  * Params:
  *  T = Type of the encapsulated value.
+ *
+ * See_Also: $(D_PSYMBOL option).
  */
 struct Option(T)
 {
@@ -530,3 +532,30 @@ struct Option(T)
         assert(toHash.toHash() == 1U);
     }
 }
+
+/**
+ * Creates a new $(D_PSYMBOL Option).
+ *
+ * Params:
+ *  T     = Option type.
+ *  value = Initial value.
+ *
+ * See_Also: $(D_PSYMBOL Option).
+ */
+Option!T option(T)(auto ref T value)
+{
+    return Option!T(forward!value);
+}
+
+/// ditto
+Option!T option(T)()
+{
+    return Option!T();
+}
+
+///
+@nogc nothrow pure @safe unittest
+{
+    assert(option!int().isNothing);
+    assert(option(5) == 5);
+}