From 3e1d2603e63cb500c3a95533f7ff6c12033a9f09 Mon Sep 17 00:00:00 2001
From: Vladimir Prus <vladimir.prus@gmail.com>
Date: Fri, 21 Jul 2017 18:30:47 +0300
Subject: [PATCH] Fix out-of-range error

Closes #31.
---
 include/boost/program_options/errors.hpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/boost/program_options/errors.hpp b/include/boost/program_options/errors.hpp
index 97a69e4..2df4096 100644
--- a/include/boost/program_options/errors.hpp
+++ b/include/boost/program_options/errors.hpp
@@ -26,7 +26,12 @@ namespace boost { namespace program_options {
     inline std::string strip_prefixes(const std::string& text)
     {
         // "--foo-bar" -> "foo-bar"
-        return text.substr(text.find_first_not_of("-/"));
+        std::string::size_type i = text.find_first_not_of("-/");
+        if (i == std::string::npos) {
+            return text;
+        } else {
+            return text.substr(i);
+        }
     }
 
     /** Base class for all errors in the library. */