From bb4f9e6498ba715911f83e0dc221a5b1b86baf51 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 24 Jul 2015 10:32:50 +0200
Subject: Further test module development

---
 build/variable | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'build/variable')

diff --git a/build/variable b/build/variable
index 9009080..368b2f8 100644
--- a/build/variable
+++ b/build/variable
@@ -175,6 +175,9 @@ namespace build
     value_proxy (): map (nullptr), p (nullptr) {}
     value_proxy (value_ptr* p, const variable_map* m): map (m), p (p) {}
 
+    template <typename T>
+    value_proxy (value_ptr& p, const T& x): map (&x.vars), p (&p) {}
+
     void
     rebind (const value_proxy& x) {map = x.map; p = x.p;}
 
@@ -204,6 +207,15 @@ namespace build
   as<const list_value&> () const {return as<list_value&> ();}
 
   template <>
+  inline const name* value_proxy::
+  as<const name*> () const
+  {
+    const auto& lv (as<const list_value&> ());
+    assert (lv.size () < 2);
+    return lv.empty () ? nullptr : &lv.front ();
+  }
+
+  template <>
   std::string& value_proxy::
   as<std::string&> () const;
 
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