From 8c5688d77555091615dccd90ea1cf28b89c08d13 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 21 Jan 2016 17:54:40 +0200
Subject: Tighten/clarify interface

---
 build2/prerequisite | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'build2/prerequisite')

diff --git a/build2/prerequisite b/build2/prerequisite
index 345c84f..6ea7fe0 100644
--- a/build2/prerequisite
+++ b/build2/prerequisite
@@ -70,7 +70,7 @@ namespace build2
           target (nullptr) {}
 
   public:
-    const std::string* proj; // NULL if not project-qualified.
+    const std::string* const proj; // NULL if not project-qualified.
     const target_type_type& type;
     const dir_path dir;      // Normalized absolute or relative (to scope).
     const std::string name;
@@ -79,6 +79,10 @@ namespace build2
     target_type* target;     // NULL if not yet resolved. Note that this should
                              // always be the "primary target", not a member of
                              // a target group.
+
+    // Note that the returned key "tracks" the prerequisite; that is, any
+    // updates to the prerequisite's members will be reflected in the key.
+    //
     prerequisite_key
     key () const
     {
-- 
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