From 73386de65fd49e7690da5203074a5ea603551db6 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 21 Feb 2024 14:21:23 +0200
Subject: Fix issue with json null representation in containers

---
 libbuild2/variable.txx | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'libbuild2/variable.txx')

diff --git a/libbuild2/variable.txx b/libbuild2/variable.txx
index 12a2667..0b831e9 100644
--- a/libbuild2/variable.txx
+++ b/libbuild2/variable.txx
@@ -1347,6 +1347,10 @@ namespace build2
   // value), but we don't yet have pair<> as value type so we let the generic
   // implementation return an untyped pair.
   //
+  // BTW, one negative consequence of returning untyped pair is that
+  // $first()/$second() don't return types values either, which is quite
+  // unfortunate for something like json_map.
+  //
   template <typename K, typename V>
   const map_value_type<K, V>
   value_traits<map<K, V>>::value_type = build2::value_type // VC14 wants =
-- 
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