From 70af0087d8efb3f2f7dc9ffdf2568419913f16da Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 30 Jun 2015 15:07:03 +0200
Subject: Group "see through" iteration, take 1

---
 build/target.ixx | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

(limited to 'build/target.ixx')

diff --git a/build/target.ixx b/build/target.ixx
index 837769e..b6bf509 100644
--- a/build/target.ixx
+++ b/build/target.ixx
@@ -2,12 +2,73 @@
 // copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
+#include <build/scope>
+
 namespace build
 {
+  // prerequisite_ref
+  //
   inline bool prerequisite_ref::
   belongs (const target& t) const
   {
     const auto& p (t.prerequisites);
     return !(p.empty () || this < &p.front () || this > &p.back ());
   }
+
+  // prerequisite_member
+  //
+  inline prerequisite& prerequisite_member::
+  as_prerequisite (tracer& trace) const
+  {
+    if (target == nullptr)
+      return prerequisite;
+
+    // The use of the group's prerequisite scope is debatable.
+    //
+    scope& s (prerequisite.get ().scope);
+    return s.prerequisites.insert (key ().tk, s, trace).first;
+  }
+
+  // prerequisite_members
+  //
+  group_view
+  resolve_group_members (action, target_group&); // <build/algorithm>
+
+  template <typename T>
+  inline auto prerequisite_members_range<T>::iterator::
+  operator++ () -> iterator&
+  {
+    if (g_.count != 0)
+    {
+      // Member iteration.
+      //
+      if (++j_ == g_.count)
+      {
+        // Switch back to prerequisite iteration.
+        //
+        g_.count = 0;
+        ++i_;
+      }
+    }
+    else
+    {
+      // Prerequisite iteration.
+      //
+      if (i_->get ().template is_a<target_group> ())
+      {
+        // Switch to member iteration.
+        //
+        target_group& g (static_cast<target_group&> (search (*i_)));
+        j_ = 0;
+        g_ = resolve_group_members (a_, g);
+
+        if (g_.count == 0)
+          ++i_; // Empty group.
+      }
+      else
+        ++i_;
+    }
+
+    return *this;
+  }
 }
-- 
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