1 files changed, 39 insertions, 0 deletions
diff --git a/boost/multiprecision/detail/big_lanczos.hpp b/boost/multiprecision/detail/big_lanczos.hpp
new file mode 100644
index 0000000000..03d3203ec8
--- /dev/null
+++ b/boost/multiprecision/detail/big_lanczos.hpp
@@ -0,0 +1,39 @@
+
+//  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_MP_BIG_LANCZOS
+#define BOOST_MP_BIG_LANCZOS
+
+#include <boost/math/bindings/detail/big_lanczos.hpp>
+
+namespace boost{ namespace math{
+
+namespace lanczos{
+
+template <class T, class Policy>
+struct lanczos;
+
+template<class Backend, boost::multiprecision::expression_template_option ExpressionTemplates, class Policy>
+struct lanczos<multiprecision::number<Backend, ExpressionTemplates>, Policy>
+{
+   typedef typename boost::math::policies::precision<multiprecision::number<Backend, ExpressionTemplates>, Policy>::type precision_type;
+   typedef typename mpl::if_c<
+      precision_type::value <= 73,
+      lanczos13UDT,
+      typename mpl::if_c<
+         precision_type::value <= 122,
+         lanczos22UDT,
+         undefined_lanczos
+      >::type
+   >::type type;
+};
+
+} // namespace lanczos
+
+}} // namespaces
+
+#endif
+