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diff --git a/boost/math/tools/big_constant.hpp b/boost/math/tools/big_constant.hpp
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+++ b/boost/math/tools/big_constant.hpp
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+
+//  Copyright (c) 2011 John Maddock
+//  Use, modification and distribution are subject to the
+//  Boost Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_MATH_TOOLS_BIG_CONSTANT_HPP
+#define BOOST_MATH_TOOLS_BIG_CONSTANT_HPP
+
+#include <boost/math/tools/config.hpp>
+#ifndef BOOST_MATH_NO_LEXICAL_CAST
+#include <boost/lexical_cast.hpp>
+#endif
+#include <boost/type_traits/is_convertible.hpp>
+
+namespace boost{ namespace math{ 
+
+namespace tools{
+
+template <class T>
+inline BOOST_CONSTEXPR_OR_CONST T make_big_value(long double v, const char*, mpl::true_ const&, mpl::false_ const&)
+{
+   return static_cast<T>(v);
+}
+template <class T>
+inline BOOST_CONSTEXPR_OR_CONST T make_big_value(long double v, const char*, mpl::true_ const&, mpl::true_ const&)
+{
+   return static_cast<T>(v);
+}
+#ifndef BOOST_MATH_NO_LEXICAL_CAST
+template <class T>
+inline T make_big_value(long double, const char* s, mpl::false_ const&, mpl::false_ const&)
+{
+   return boost::lexical_cast<T>(s);
+}
+#endif
+template <class T>
+inline BOOST_CONSTEXPR const char* make_big_value(long double, const char* s, mpl::false_ const&, mpl::true_ const&)
+{
+   return s;
+}
+
+//
+// For constants which might fit in a long double (if it's big enough):
+//
+#define BOOST_MATH_BIG_CONSTANT(T, D, x)\
+   boost::math::tools::make_big_value<T>(\
+      BOOST_JOIN(x, L), \
+      BOOST_STRINGIZE(x), \
+      mpl::bool_< (is_convertible<long double, T>::value) && \
+         ((D <= std::numeric_limits<long double>::digits) \
+          || is_floating_point<T>::value \
+          || (std::numeric_limits<T>::is_specialized && \
+             (std::numeric_limits<T>::digits10 <= std::numeric_limits<long double>::digits10))) >(), \
+      boost::is_convertible<const char*, T>())
+//
+// For constants too huge for any conceivable long double (and which generate compiler errors if we try and declare them as such):
+//
+#define BOOST_MATH_HUGE_CONSTANT(T, D, x)\
+   boost::math::tools::make_big_value<T>(0.0L, BOOST_STRINGIZE(x), \
+   mpl::bool_<is_floating_point<T>::value || (std::numeric_limits<T>::is_specialized && std::numeric_limits<T>::max_exponent <= std::numeric_limits<long double>::max_exponent && std::numeric_limits<T>::digits <= std::numeric_limits<long double>::digits)>(), \
+   boost::is_convertible<const char*, T>())
+
+}}} // namespaces
+
+#endif
+