From b79f7cae36fdc5e50019627c7af951d47936e2da Mon Sep 17 00:00:00 2001
From: Philipp Claves <claves@budelmann-elektronik.com>
Date: Thu, 9 Mar 2017 11:51:50 +0100
Subject: [PATCH] Interpret input starting with 0x as hex numbers in the
 default parser.

bool and string options remain unaffected.
---
 include/cxxopts.hpp | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/include/cxxopts.hpp b/include/cxxopts.hpp
index c33c06a..06b1896 100644
--- a/include/cxxopts.hpp
+++ b/include/cxxopts.hpp
@@ -404,9 +404,17 @@ namespace cxxopts
     parse_value(const std::string& text, T& value)
     {
       std::istringstream is(text);
-      if (!(is >> value))
-      {
-        throw argument_incorrect_type(text);
+      if (text.substr(0, 2) == "0x"){ //Hex number input
+        is.seekg(2);
+        if (!(is >> std::hex >> value))
+        {
+           throw argument_incorrect_type(text);
+        }
+      } else {
+        if (!(is >> value))
+        {
+           throw argument_incorrect_type(text);
+        }
       }
 
       if (is.rdbuf()->in_avail() != 0)