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diff --git a/boost/vmd/assert_is_number.hpp b/boost/vmd/assert_is_number.hpp
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+++ b/boost/vmd/assert_is_number.hpp
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+
+//  (C) Copyright Edward Diener 2011-2015
+//  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).
+
+#if !defined(BOOST_VMD_ASSERT_IS_NUMBER_HPP)
+#define BOOST_VMD_ASSERT_IS_NUMBER_HPP
+
+#include <boost/vmd/detail/setup.hpp>
+
+#if BOOST_PP_VARIADICS
+
+/*
+
+  The succeeding comments in this file are in doxygen format.
+
+*/
+
+/** \file
+*/
+
+/** \def BOOST_VMD_ASSERT_IS_NUMBER(sequence)
+
+    \brief Asserts that the sequence is a number.
+
+    The macro checks that the parameter is a number.
+    If it is not a number, it forces a compiler error.
+    
+    The macro normally checks for a number only in 
+    debug mode. However an end-user can force the macro 
+    to check or not check by defining the macro 
+    BOOST_VMD_ASSERT_DATA to 1 or 0 respectively.
+
+    sequence = a possible number.
+
+    returns  = Normally the macro returns nothing. 
+    
+               If the sequence is a number, nothing is 
+               output.
+              
+               For VC++, because there is no sure way of forcing  
+               a compiler error from within a macro without producing
+               output, if the sequence is not a number the 
+               macro forces a compiler error by outputting invalid C++.
+              
+               For all other compilers a compiler error is forced 
+               without producing output if the sequence is not a 
+               number.
+    
+*/
+
+#if !BOOST_VMD_ASSERT_DATA
+
+#define BOOST_VMD_ASSERT_IS_NUMBER(sequence)
+
+#else
+
+#include <boost/vmd/assert.hpp>
+#include <boost/vmd/is_number.hpp>
+
+#define BOOST_VMD_ASSERT_IS_NUMBER(sequence) \
+    BOOST_VMD_ASSERT \
+          ( \
+          BOOST_VMD_IS_NUMBER(sequence), \
+          BOOST_VMD_IS_NUMBER_ASSERT_ERROR \
+          ) \
+/**/
+
+#endif // !BOOST_VMD_ASSERT_DATA
+
+#endif /* BOOST_PP_VARIADICS */
+#endif /* BOOST_VMD_ASSERT_IS_NUMBER_HPP */