From 16e74b781e0fafeed0312c9fa0fd1ae03cf432ea Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 30 Sep 2019 15:10:24 +0200
Subject: Allow attributes in if-else, assert directive's conditions

---
 libbuild2/variable.hxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'libbuild2/variable.hxx')

diff --git a/libbuild2/variable.hxx b/libbuild2/variable.hxx
index 3eed61e..3cb3d7f 100644
--- a/libbuild2/variable.hxx
+++ b/libbuild2/variable.hxx
@@ -621,7 +621,8 @@ namespace build2
   //template <typename T> T convert (names&&); (declaration causes ambiguity)
 
   // Convert value to T. If value is already of type T, then simply cast it.
-  // Otherwise call convert(names) above.
+  // Otherwise call convert(names) above. If value is NULL, then throw
+  // invalid_argument (with an appropriate message).
   //
   template <typename T> T convert (value&&);
 
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