From 8e35f78ad1fca3da2e96a208cda8a6ca9aa88df4 Mon Sep 17 00:00:00 2001
From: Eddie James <eajames@linux.ibm.com>
Date: Thu, 30 Jun 2022 11:29:46 -0500
Subject: [PATCH] Set input stream base 0 for prefix-dependent parsing

In order to support hexadecimal and octal values by their prefix, set
the input stream base to zero.
---
 include/flags.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/flags.h b/include/flags.h
index 7dcd61b..c43465c 100644
--- a/include/flags.h
+++ b/include/flags.h
@@ -3,6 +3,7 @@
 
 #include <algorithm>
 #include <array>
+#include <iomanip>
 #include <optional>
 #include <sstream>
 #include <string>
@@ -95,7 +96,9 @@ template <class T>
 std::optional<T> get(const argument_map& options,
                      const std::string_view& option) {
   if (const auto view = get_value(options, option)) {
-    if (T value; std::istringstream(std::string(*view)) >> value) return value;
+    if (T value;
+        std::istringstream(std::string(*view)) >> std::setbase(0) >> value)
+      return value;
   }
   return std::nullopt;
 }
@@ -140,7 +143,7 @@ std::optional<T> get(const std::vector<std::string_view>& positional_arguments,
   if (positional_index < positional_arguments.size()) {
     if (T value; std::istringstream(
                      std::string(positional_arguments[positional_index])) >>
-                 value)
+                 std::setbase(0) >> value)
       return value;
   }
   return std::nullopt;