From 6e91cb7cdb0c4f000a79d20d8578890d56bcdc84 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 22 Jan 2021 08:39:10 +0200
Subject: Add support for optional pair halves in variable values

---
 libbuild2/variable.cxx | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'libbuild2/variable.cxx')

diff --git a/libbuild2/variable.cxx b/libbuild2/variable.cxx
index f5476b5..47703da 100644
--- a/libbuild2/variable.cxx
+++ b/libbuild2/variable.cxx
@@ -1832,8 +1832,20 @@ namespace build2
   value_traits<vector<pair<string, string>>>;
 
   template struct LIBBUILD2_DEFEXPORT
+  value_traits<vector<pair<string, optional<string>>>>;
+
+  template struct LIBBUILD2_DEFEXPORT
+  value_traits<vector<pair<optional<string>, string>>>;
+
+  template struct LIBBUILD2_DEFEXPORT
   value_traits<std::map<string, string>>;
 
   template struct LIBBUILD2_DEFEXPORT
+  value_traits<std::map<string, optional<string>>>;
+
+  template struct LIBBUILD2_DEFEXPORT
+  value_traits<std::map<optional<string>, string>>;
+
+  template struct LIBBUILD2_DEFEXPORT
   value_traits<std::map<project_name, dir_path>>;
 }
-- 
cgit v1.1