updated boost on windows

winx64/include/boost/math/tools/detail/is_const_iterable.hpp

@@ -0,0 +1,40 @@
+//  (C) Copyright John Maddock 2018.
+//  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_IS_CONST_ITERABLE_HPP
+#define BOOST_MATH_TOOLS_IS_CONST_ITERABLE_HPP
+
+#if !defined(BOOST_NO_CXX14_VARIABLE_TEMPLATES) && !defined(BOOST_NO_CXX11_DECLTYPE) && !defined(BOOST_NO_CXX11_SFINAE_EXPR)
+
+#define BOOST_MATH_HAS_IS_CONST_ITERABLE
+
+#include <boost/type_traits/is_detected.hpp>
+#include <utility>
+
+namespace boost {
+   namespace math {
+      namespace tools {
+         namespace detail {
+
+            template<class T>
+            using begin_t = decltype(std::declval<const T&>().begin());
+            template<class T>
+            using end_t = decltype(std::declval<const T&>().end());
+            template<class T>
+            using const_iterator_t = typename T::const_iterator;
+
+            template <class T>
+            struct is_const_iterable
+               : public boost::integral_constant<bool,
+               boost::is_detected<begin_t, T>::value
+               && boost::is_detected<end_t, T>::value
+               && boost::is_detected<const_iterator_t, T>::value
+               > {};
+
+} } } }
+
+#endif
+
+#endif // BOOST_MATH_TOOLS_IS_CONST_ITERABLE_HPP