From 54d90ffbf325a421d625621a597d9ca4e357bc58 Mon Sep 17 00:00:00 2001
From: John Wellbelove <smartgit@wellbelove.co.uk>
Date: Sat, 18 Jun 2016 07:06:06 +0100
Subject: [PATCH] Changed definitions for 'char' for is_signed and is_unsigned
 to handle instances where char can be unsigned.

---
 src/type_traits.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/type_traits.h b/src/type_traits.h
index b67c55e8..bef809ae 100644
--- a/src/type_traits.h
+++ b/src/type_traits.h
@@ -152,7 +152,7 @@ namespace etl
   /// is_signed
   ///\ingroup type_traits
   template <typename T> struct is_signed : false_type {};
-  template <> struct is_signed<char> : true_type {};
+  template <> struct is_signed<char> : integral_constant<bool, (char(255) < 0)> {};
   template <> struct is_signed<wchar_t> : public etl::integral_constant<bool, static_cast<bool>(wchar_t(-1) < wchar_t(0))> {};
   template <> struct is_signed<signed char> : true_type {};
   template <> struct is_signed<short> : true_type {};
@@ -170,6 +170,7 @@ namespace etl
   ///\ingroup type_traits
   template <typename T> struct is_unsigned : false_type {};
   template <> struct is_unsigned<bool> : true_type {};
+  template <> struct is_unsigned<char> : integral_constant<bool, (char(255) > 0)> {};
   template <> struct is_unsigned<unsigned char> : true_type {};
   template <> struct is_unsigned<wchar_t> : public etl::integral_constant<bool, (wchar_t(-1) > wchar_t(0))> {};
   template <> struct is_unsigned<unsigned short> : true_type {};