From 323e774380995c04ae705e29ae0e51d62246333d Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 9 Nov 2017 17:06:35 +0200
Subject: Add support for for-loop

The semantics is similar to the C++11 range-based for:

list = 1 2 3
for i: $list
  print $i

Note that there is no scoping of any kind for the loop variable ('i' in
the above example).

See tests/loop/for.test for some examples/ideas.

In the future the plan is to also support more general while-loop as well
as break and continue.
---
 build2/variable.txx | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'build2/variable.txx')

diff --git a/build2/variable.txx b/build2/variable.txx
index f75ffd6..aebbe1a 100644
--- a/build2/variable.txx
+++ b/build2/variable.txx
@@ -395,6 +395,7 @@ namespace build2
     nullptr,                          // Patched above.
     sizeof (vector<T>),
     nullptr,                          // No base.
+    &value_traits<T>::value_type,
     &default_dtor<vector<T>>,
     &default_copy_ctor<vector<T>>,
     &default_copy_assign<vector<T>>,
@@ -563,6 +564,7 @@ namespace build2
     nullptr,             // Patched above.
     sizeof (map<K, V>),
     nullptr,             // No base.
+    nullptr,             // No element.
     &default_dtor<map<K, V>>,
     &default_copy_ctor<map<K, V>>,
     &default_copy_assign<map<K, V>>,
-- 
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