# Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world.

### boost/vmd/is_number.hpp


//  (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

#if !defined(BOOST_VMD_IS_NUMBER_HPP)
#define BOOST_VMD_IS_NUMBER_HPP

#include <boost/vmd/detail/setup.hpp>

#include <boost/vmd/detail/is_number.hpp>

/*

The succeeding comments in this file are in doxygen format.

*/

/** \file
*/

/** \def BOOST_VMD_IS_NUMBER(sequence)

\brief Tests whether a sequence is a Boost PP number.

The macro checks to see if a sequence is a Boost PP number.
A Boost PP number is a value from 0 to 256.

sequence = a possible number

returns = 1 if the sequence is a Boost PP number,
0 if it is not.

If the input is not a VMD data type this macro could lead to
a preprocessor error. This is because the macro
uses preprocessor concatenation to determine if the input
is a number once it is determined that the input does not