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89 lines
2.1 KiB
89 lines
2.1 KiB
//////////////////////////////////////////////////////////////////// |
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// |
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// Copyright Vicente J. Botet Escriba 2010 |
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// |
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// Distributed under the Boost Software License, Version 1.0. |
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// (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// |
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// See http://www.boost.org/libs/mpl for documentation. |
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// |
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//////////////////////////////////////////////////////////////////// |
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#ifndef BOOST_MPL_ABS_HPP_INCLUDED |
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#define BOOST_MPL_ABS_HPP_INCLUDED |
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#include <boost/mpl/integral_c.hpp> |
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#include <boost/mpl/aux_/na_spec.hpp> |
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#include <boost/mpl/aux_/lambda_support.hpp> |
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#include <boost/mpl/aux_/config/eti.hpp> |
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#include <boost/mpl/aux_/config/integral.hpp> |
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#include <boost/mpl/aux_/config/static_constant.hpp> |
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#if !defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2) \ |
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&& !defined(BOOST_MPL_PREPROCESSING_MODE) \ |
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&& ( defined(BOOST_MSVC) \ |
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|| BOOST_WORKAROUND(__EDG_VERSION__, <= 238) \ |
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) |
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# define BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2 |
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#endif |
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namespace boost { namespace mpl { |
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template< typename Tag > struct abs_impl; |
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template< typename T > struct abs_tag |
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{ |
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typedef typename T::tag type; |
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}; |
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template< |
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typename BOOST_MPL_AUX_NA_PARAM(N) |
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> |
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struct abs |
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: abs_impl< |
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typename abs_tag<N>::type |
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>::template apply<N>::type |
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{ |
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BOOST_MPL_AUX_LAMBDA_SUPPORT(1, abs, (N)) |
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}; |
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BOOST_MPL_AUX_NA_SPEC(1, abs) |
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template< |
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typename T |
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, T n1 |
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> |
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struct abs_c |
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: abs<integral_c<T,n1> > |
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{ |
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}; |
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#if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2) |
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namespace aux { |
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template< typename T, T n > struct abs_wknd |
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{ |
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BOOST_STATIC_CONSTANT(T, value = (n < 0 ? -n : n)); |
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typedef integral_c<T,value> type; |
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}; |
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} |
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#endif |
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template<> |
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struct abs_impl<integral_c_tag> |
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{ |
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#if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2) |
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template< typename N > struct apply |
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: aux::abs_wknd< typename N::value_type, N::value > |
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#else |
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template< typename N > struct apply |
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: integral_c< typename N::value_type, ((N::value < 0) ? (-N::value) : N::value ) > |
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#endif |
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{ |
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}; |
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}; |
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}} |
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#endif // BOOST_MPL_ABS_HPP_INCLUDED
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