90 lines
2.1 KiB
Plaintext
90 lines
2.1 KiB
Plaintext
|
////////////////////////////////////////////////////////////////////
|
||
|
|
//
|
||
|
|
// Copyright Vicente J. Botet Escriba 2010
|
||
|
|
//
|
||
|
|
// Distributed under 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/mpl for documentation.
|
||
|
|
//
|
||
|
|
////////////////////////////////////////////////////////////////////
|
||
|
|
#ifndef BOOST_MPL_ABS_HPP_INCLUDED
|
||
|
|
#define BOOST_MPL_ABS_HPP_INCLUDED
|
||
|
|
|
||
|
|
#include <boost/mpl/integral_c.hpp>
|
||
|
|
#include <boost/mpl/aux_/na_spec.hpp>
|
||
|
|
#include <boost/mpl/aux_/lambda_support.hpp>
|
||
|
|
#include <boost/mpl/aux_/config/integral.hpp>
|
||
|
|
#include <boost/mpl/aux_/config/static_constant.hpp>
|
||
|
|
|
||
|
|
#if !defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2) \
|
||
|
|
&& !defined(BOOST_MPL_PREPROCESSING_MODE) \
|
||
|
|
&& !defined(__CUDACC__) \
|
||
|
|
&& ( defined(BOOST_MSVC) \
|
||
|
|
|| BOOST_WORKAROUND(__EDG_VERSION__, <= 238) \
|
||
|
|
)
|
||
|
|
|
||
|
|
# define BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
namespace boost { namespace mpl {
|
||
|
|
|
||
|
|
template< typename Tag > struct abs_impl;
|
||
|
|
|
||
|
|
template< typename T > struct abs_tag
|
||
|
|
{
|
||
|
|
typedef typename T::tag type;
|
||
|
|
};
|
||
|
|
|
||
|
|
template<
|
||
|
|
typename BOOST_MPL_AUX_NA_PARAM(N)
|
||
|
|
>
|
||
|
|
struct abs
|
||
|
|
: abs_impl<
|
||
|
|
typename abs_tag<N>::type
|
||
|
|
>::template apply<N>::type
|
||
|
|
{
|
||
|
|
BOOST_MPL_AUX_LAMBDA_SUPPORT(1, abs, (N))
|
||
|
|
};
|
||
|
|
|
||
|
|
BOOST_MPL_AUX_NA_SPEC(1, abs)
|
||
|
|
|
||
|
|
template<
|
||
|
|
typename T
|
||
|
|
, T n1
|
||
|
|
>
|
||
|
|
struct abs_c
|
||
|
|
: abs<integral_c<T,n1> >
|
||
|
|
{
|
||
|
|
};
|
||
|
|
|
||
|
|
#if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2)
|
||
|
|
namespace aux {
|
||
|
|
template< typename T, T n > struct abs_wknd
|
||
|
|
{
|
||
|
|
BOOST_STATIC_CONSTANT(T, value = (n < 0 ? -n : n));
|
||
|
|
typedef integral_c<T,value> type;
|
||
|
|
};
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct abs_impl<integral_c_tag>
|
||
|
|
{
|
||
|
|
#if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2)
|
||
|
|
template< typename N > struct apply
|
||
|
|
: aux::abs_wknd< typename N::value_type, N::value >
|
||
|
|
#else
|
||
|
|
template< typename N > struct apply
|
||
|
|
: integral_c< typename N::value_type, ((N::value < 0) ? (-N::value) : N::value ) >
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
}}
|
||
|
|
|
||
|
|
#endif // BOOST_MPL_ABS_HPP_INCLUDED
|