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+//  (C) Copyright John Maddock 2007. 
+//  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).
+//
+//  See http://www.boost.org/libs/type_traits for most recent version including documentation.
+
+#ifndef BOOST_TT_IS_COMPLEX_HPP
+#define BOOST_TT_IS_COMPLEX_HPP
+
+#include <complex>
+#include <boost/type_traits/integral_constant.hpp>
+
+namespace boost {
+
+   template <class T> struct is_complex : public false_type {};
+   template <class T> struct is_complex<const T > : public is_complex<T>{};
+   template <class T> struct is_complex<volatile const T > : public is_complex<T>{};
+   template <class T> struct is_complex<volatile T > : public is_complex<T>{};
+   template <class T> struct is_complex<std::complex<T> > : public true_type{};
+
+} // namespace boost
+
+#endif //BOOST_TT_IS_COMPLEX_HPP