From 4372f041bb7401c3adc2d5710566b13f64722102 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 27 Feb 2015 16:57:34 +0200
Subject: Variable assignment, appending support

---
 build/scope | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

(limited to 'build/scope')

diff --git a/build/scope b/build/scope
index 6d96b0a..2746ff8 100644
--- a/build/scope
+++ b/build/scope
@@ -20,8 +20,17 @@ namespace build
     const path_type&
     path () const {return i_->first;} // Absolute and normalized.
 
-    scope&
-    parent () const {return *parent_;}
+    scope*
+    parent () const {return parent_;}
+
+    // Variable lookup.
+    //
+  public:
+    value*
+    operator[] (const variable&);
+
+    value*
+    operator[] (const std::string& name);
 
   private:
     friend class scope_map;
@@ -45,7 +54,7 @@ namespace build
     scope* parent_;
   };
 
-  class scope_map: path_map<scope>
+  class scope_map: public path_map<scope>
   {
   public:
     // Note that we assume the first insertion into the map is that
-- 
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