boost/icl/type_traits/is_numeric.hpp

/*-----------------------------------------------------------------------------+
Copyright (c) 2010-2010: Joachim Faulhaber
+------------------------------------------------------------------------------+
   Distributed under the Boost Software License, Version 1.0.
      (See accompanying file LICENCE.txt or copy at
           http://www.boost.org/LICENSE_1_0.txt)
+-----------------------------------------------------------------------------*/
#ifndef BOOST_ICL_TYPE_TRAITS_IS_NUMERIC_HPP_JOFA_100322
#define BOOST_ICL_TYPE_TRAITS_IS_NUMERIC_HPP_JOFA_100322

#include <limits>
#include <complex>

namespace boost{ namespace icl
{

template <class Type> struct is_numeric
{
    typedef is_numeric type;
    BOOST_STATIC_CONSTANT(bool, value = (0 < std::numeric_limits<Type>::digits));
};

template <class Type> 
struct is_numeric<std::complex<Type> >
{
    typedef is_numeric type;
    BOOST_STATIC_CONSTANT(bool, value = true);
};

//--------------------------------------------------------------------------
template<class Type, bool Enable = false> struct numeric_minimum;

template<class Type> 
struct numeric_minimum<Type, false>
{
    static bool is_less_than(Type){ return true; }
    static bool is_less_than_or(Type, bool){ return true; }
};

template<class Type> 
struct numeric_minimum<Type, true>
{
    static bool is_less_than(Type value)
    { return (std::numeric_limits<Type>::min)() < value; }

    static bool is_less_than_or(Type value, bool cond)
    { return cond || is_less_than(value); }
};

}} // namespace boost icl

#endif

Boost C++ Libraries

boost/icl/type_traits/is_numeric.hpp