From 56492ce9c3addf43d8138da458849b9b190462f5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Th=C3=A9o=20Delrieu?= <theo@tanker.io>
Date: Sat, 22 Oct 2016 19:04:59 +0200
Subject: [PATCH] fix compilation on vs2015 (taken from MS-ranges)

---
 src/json.hpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/json.hpp b/src/json.hpp
index 0e14ec8d5..7a8d76ae0 100644
--- a/src/json.hpp
+++ b/src/json.hpp
@@ -146,6 +146,9 @@ struct has_mapped_type
         std::is_integral<decltype(detect(std::declval<T>()))>::value;
 };
 
+void to_json();
+void from_json();
+
 struct to_json_fn
 {
   private: