From cbf8fd9cc9523901616de74f4252a49c3241190b Mon Sep 17 00:00:00 2001
From: John Maddock <john@johnmaddock.co.uk>
Date: Mon, 1 Jul 2013 18:14:14 +0000
Subject: [PATCH] Correct output of small-integer types. Fixes #8745.

[SVN r84928]
---
 include/boost/multiprecision/cpp_int.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/boost/multiprecision/cpp_int.hpp b/include/boost/multiprecision/cpp_int.hpp
index 54536a49..1475c7b8 100644
--- a/include/boost/multiprecision/cpp_int.hpp
+++ b/include/boost/multiprecision/cpp_int.hpp
@@ -1427,11 +1427,12 @@ public:
 private:
    std::string do_get_trivial_string(std::ios_base::fmtflags f, const mpl::false_&)const
    {
+      typedef typename mpl::if_c<sizeof(*this->limbs()) == 1, unsigned, typename base_type::local_limb_type>::type io_type;
       if(this->sign() && (((f & std::ios_base::hex) == std::ios_base::hex) || ((f & std::ios_base::oct) == std::ios_base::oct)))
          BOOST_THROW_EXCEPTION(std::runtime_error("Base 8 or 16 printing of negative numbers is not supported."));
       std::stringstream ss;
       ss.flags(f & ~std::ios_base::showpos);
-      ss << *this->limbs();
+      ss << static_cast<io_type>(*this->limbs());
       std::string result;
       if(this->sign())
          result += '-';