You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and dots ('.'), can be up to 35 characters long. Letters must be lowercase.
89 lines
2.1 KiB
89 lines
2.1 KiB
//////////////////////////////////////////////////////////////////// |
|
// |
|
// 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_SIGN_HPP_INCLUDED |
|
#define BOOST_MPL_SIGN_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/eti.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(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 sign_impl; |
|
|
|
template< typename T > struct sign_tag |
|
{ |
|
typedef typename T::tag type; |
|
}; |
|
|
|
template< |
|
typename BOOST_MPL_AUX_NA_PARAM(N) |
|
> |
|
struct sign |
|
: sign_impl< |
|
typename sign_tag<N>::type |
|
>::template apply<N>::type |
|
{ |
|
BOOST_MPL_AUX_LAMBDA_SUPPORT(1, sign, (N)) |
|
}; |
|
|
|
BOOST_MPL_AUX_NA_SPEC(1, sign) |
|
|
|
template< |
|
typename T |
|
, T n1 |
|
> |
|
struct sign_c |
|
: sign<integral_c<T,n1> > |
|
{ |
|
}; |
|
|
|
#if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2) |
|
namespace aux { |
|
template< typename T, T n > struct sign_wknd |
|
{ |
|
BOOST_STATIC_CONSTANT(T, value = (n == 0 ? 0 : (n < 0 ? -1 : 1))); |
|
typedef integral_c<T,value> type; |
|
}; |
|
} |
|
#endif |
|
|
|
template<> |
|
struct sign_impl<integral_c_tag> |
|
{ |
|
#if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2) |
|
template< typename N > struct apply |
|
: aux::sign_wknd< typename N::value_type, N::value > |
|
#else |
|
template< typename N > struct apply |
|
: integral_c< typename N::value_type, (N::value == 0 ? 0 : (N::value < 0 ? -1 : 1)) > |
|
#endif |
|
{ |
|
}; |
|
}; |
|
|
|
}} |
|
|
|
#endif // BOOST_MPL_SIGN_HPP_INCLUDED
|
|
|