From 67b36b32e19e17db9b1e5c72deb8db7202a0f41b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 9 Aug 2018 09:36:23 +0200
Subject: Add support for returning optional<T> from (buildfile) function
 implementations

---
 build2/variable.hxx | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'build2/variable.hxx')

diff --git a/build2/variable.hxx b/build2/variable.hxx
index 401cc77..7a0e531 100644
--- a/build2/variable.hxx
+++ b/build2/variable.hxx
@@ -250,10 +250,17 @@ namespace build2
     explicit
     value (names); // Create untyped value.
 
+    explicit
+    value (optional<names>);
+
     template <typename T>
     explicit
     value (T); // Create value of value_traits<T>::value_type type.
 
+    template <typename T>
+    explicit
+    value (optional<T>);
+
     // Note: preserves type.
     //
     value&
-- 
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