From 5058b155076b004f4abf21be6cf657a3f2cc4d1b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sun, 20 Aug 2017 15:56:26 +0200
Subject: Add support for not cleaning generated version file

---
 build2/variable.ixx | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'build2/variable.ixx')

diff --git a/build2/variable.ixx b/build2/variable.ixx
index 8656a04..04cf6dc 100644
--- a/build2/variable.ixx
+++ b/build2/variable.ixx
@@ -193,6 +193,15 @@ namespace build2
   cast_false (const lookup& l) {return l && cast<T> (l);}
 
   template <typename T>
+  inline T
+  cast_true (const value& v) {return !v || cast<T> (v);}
+
+  template <typename T>
+  inline T
+  cast_true (const lookup& l) {return !l || cast<T> (l);}
+
+
+  template <typename T>
   inline void
   typify (value& v, const variable& var)
   {
-- 
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