Rework postponed logic

Specifically, now postponed is only used by the execution mode logic
and rules should not return it directly.

1 files changed, 6 insertions, 4 deletions

diff --git a/build/algorithm b/build/algorithm
index 99e6c2b..af461dc 100644
--- a/build/algorithm
+++ b/build/algorithm
@@ -67,13 +67,15 @@ namespace build
   // Match and apply a rule to the action/target with ambiguity
   // detection. Increment the target's dependents count, which
   // means that you should call this function with the intent
-  // to also call execute(). In case of optimizations that
-  // would avoid calling execute(), decrement the dependents
-  // cound manually to compensate.
+  // to also call execute(). In case of optimizations that would
+  // avoid calling execute(), call unmatch() to indicate this.
   //
   void
   match (action, target&);
 
+  void
+  unmatch (action, target&);
+
   // Match (but do not apply) a rule to the action/target with
   // ambiguity detection. Note that this function does not touch
   // the dependents count.
@@ -84,7 +86,7 @@ namespace build
   // Match a "delegate rule" from withing another rules' apply()
   // function. Return recipe and recipe action (if any). Note
   // that unlike match(), this call doesn't increment the
-  // dependents count. See also execute_delegate().
+  // dependents count. See also the companion execute_delegate().
   //
   std::pair<recipe, action>
   match_delegate (action, target&);