From 7b9eb752cad04aaadc4552d0f26d307b04af1869 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 7 Feb 2017 08:09:53 +0200
Subject: Pass const target& to recipes

---
 build2/algorithm.ixx | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

(limited to 'build2/algorithm.ixx')

diff --git a/build2/algorithm.ixx b/build2/algorithm.ixx
index cf234d8..0c171fd 100644
--- a/build2/algorithm.ixx
+++ b/build2/algorithm.ixx
@@ -173,7 +173,7 @@ namespace build2
   }
 
   inline target_state
-  execute_delegate (const recipe& r, action a, target& t)
+  execute_delegate (const recipe& r, action a, const target& t)
   {
     return r (a, t);
   }
@@ -181,13 +181,13 @@ namespace build2
   // If the first argument is NULL, then the result is treated as a boolean
   // value.
   //
-  pair<target*, target_state>
+  pair<const target*, target_state>
   execute_prerequisites (const target_type*,
-                         action, target&,
+                         action, const target&,
                          const timestamp&, const prerequisite_filter&);
 
   inline pair<bool, target_state>
-  execute_prerequisites (action a, target& t,
+  execute_prerequisites (action a, const target& t,
                          const timestamp& mt, const prerequisite_filter& pf)
   {
     auto p (execute_prerequisites (nullptr, a, t, mt, pf));
@@ -195,29 +195,29 @@ namespace build2
   }
 
   template <typename T>
-  inline pair<T*, target_state>
-  execute_prerequisites (action a, target& t,
+  inline pair<const T*, target_state>
+  execute_prerequisites (action a, const target& t,
                          const timestamp& mt, const prerequisite_filter& pf)
   {
     auto p (execute_prerequisites (T::static_type, a, t, mt, pf));
-    return make_pair (static_cast<T*> (p.first), p.second);
+    return make_pair (static_cast<const T*> (p.first), p.second);
   }
 
-  inline pair<target*, target_state>
+  inline pair<const target*, target_state>
   execute_prerequisites (const target_type& tt,
-                         action a, target& t,
+                         action a, const target& t,
                          const timestamp& mt, const prerequisite_filter& pf)
   {
     return execute_prerequisites (&tt, a, t, mt, pf);
   }
 
   template <typename T>
-  inline pair<T*, target_state>
+  inline pair<const T*, target_state>
   execute_prerequisites (const target_type& tt,
-                         action a, target& t,
+                         action a, const target& t,
                          const timestamp& mt, const prerequisite_filter& pf)
   {
     auto p (execute_prerequisites (tt, a, t, mt, pf));
-    return make_pair (static_cast<T*> (p.first), p.second);
+    return make_pair (static_cast<const T*> (p.first), p.second);
   }
 }
-- 
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