From a1cec9e0df14f3c1a833e2a447b5324ff9c430d3 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 21 Jul 2015 16:21:07 +0200
Subject: Test module genesis

---
 build/rule | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

(limited to 'build/rule')

diff --git a/build/rule b/build/rule
index 5b0149b..ea0b5ae 100644
--- a/build/rule
+++ b/build/rule
@@ -23,9 +23,19 @@ namespace build
     // Can contain neither (both are NULL), one of, or both. If both
     // are NULL, then it is a "no match" indicator.
     //
-    prerequisite_type* prerequisite;
+    // Note that if the "payload" is stored in value instead of
+    // prerequisite, then target must not be NULL.
+    //
+    union
+    {
+      prerequisite_type* prerequisite;
+      bool value;
+    };
+
     target_type* target;
 
+    match_result (target_type& t, bool v): value (v), target (&t) {}
+
     match_result (std::nullptr_t v = nullptr): prerequisite (v), target (v) {}
     match_result (prerequisite_type& p): prerequisite (&p), target (nullptr) {}
     match_result (prerequisite_type* p): prerequisite (p), target (nullptr) {}
@@ -37,7 +47,7 @@ namespace build
     explicit
     operator bool () const
     {
-      return prerequisite != nullptr || target != nullptr;
+      return target != nullptr || prerequisite != nullptr;
     }
   };
 
@@ -65,6 +75,8 @@ namespace build
 
     static target_state
     perform_update (action, target&);
+
+    static file_rule instance;
   };
 
   class alias_rule: public rule
@@ -75,6 +87,8 @@ namespace build
 
     virtual recipe
     apply (action, target&, const match_result&) const;
+
+    static alias_rule instance;
   };
 
   class fsdir_rule: public rule
@@ -91,6 +105,8 @@ namespace build
 
     static target_state
     perform_clean (action, target&);
+
+    static fsdir_rule instance;
   };
 }
 
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