From b0c6b33f205f625fe6cc368a8cc10f2b9282781a Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Mon, 5 Aug 2013 20:54:19 +1000
Subject: [PATCH] Add to_json for bool, nullptr, string

---
 json.cpp.rl | 24 ++++++++++++++++++++++++
 json.hpp    |  2 +-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/json.cpp.rl b/json.cpp.rl
index 3f5f2bd5..b2881e04 100644
--- a/json.cpp.rl
+++ b/json.cpp.rl
@@ -557,3 +557,27 @@ json::null::write (std::ostream &os) const {
 ostream&
 json::operator <<(ostream &os, const json::node &n)
     { return n.write (os); }
+
+
+//-----------------------------------------------------------------------------
+// to_json
+
+namespace json {
+    template <>
+    std::unique_ptr<node>
+    io<bool>::serialise (const bool &b) {
+        return std::unique_ptr<node> (new boolean (b));
+    }
+
+    template <>
+    std::unique_ptr<node>
+    io<nullptr_t>::serialise (const nullptr_t &) {
+        return std::unique_ptr<node> (new null ());
+    }
+
+    template <>
+    std::unique_ptr<node>
+    io<std::string>::serialise (const std::string &s) {
+        return std::unique_ptr<node> (new string (s));
+    }
+}
diff --git a/json.hpp b/json.hpp
index b86476e9..56385619 100644
--- a/json.hpp
+++ b/json.hpp
@@ -286,7 +286,7 @@ namespace json {
 
 
 template <typename T, class ...Args>
-json::node&& to_json (const T &t, Args&&... args) {
+std::unique_ptr<json::node> to_json (const T &t, Args&&... args) {
     return json::io<T>::serialise (t, std::forward<Args>(args)...);
 }