From 677eb1e1017630a1d1abbb528d28b90110990ef4 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 22 Jan 2024 12:02:41 +0200
Subject: Initial take

---
 libbuild2/variable.hxx | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'libbuild2/variable.hxx')

diff --git a/libbuild2/variable.hxx b/libbuild2/variable.hxx
index a91a7e0..eddf1ac 100644
--- a/libbuild2/variable.hxx
+++ b/libbuild2/variable.hxx
@@ -15,6 +15,8 @@
 #include <libbuild2/forward.hxx>
 #include <libbuild2/utility.hxx>
 
+#include <libbuild2/json.hxx>
+
 #include <libbuild2/context.hxx>
 #include <libbuild2/target-type.hxx>
 #include <libbuild2/diagnostics.hxx>
@@ -1179,6 +1181,24 @@ namespace build2
     static const map_value_type<K, V> value_type;
   };
 
+  // json
+  //
+  template <>
+  struct LIBBUILD2_SYMEXPORT value_traits<json_value>
+  {
+    static_assert (sizeof (json_value) <= value::size_, "insufficient space");
+
+    static json_value convert (names&&);
+    static void assign (value&, json_value&&);
+    static void append (value&, json_value&&);
+    static void prepend (value&, json_value&&);
+    static bool empty (const json_value&); // null or empty string|array|object
+
+    static const json_value empty_instance; // null
+    static const char* const type_name;
+    static const build2::value_type value_type;
+  };
+
   // Canned command line to be re-lexed (used in {Build,Test}scripts).
   //
   // Note that because the executable can be specific as a target or as
-- 
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