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93 lines
2.8 KiB
C++
93 lines
2.8 KiB
C++
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// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2014-2015 Samuel Debionne, Grenoble, France.
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// This file was modified by Oracle on 2015.
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// Modifications copyright (c) 2015, Oracle and/or its affiliates.
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// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (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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#ifndef BOOST_GEOMETRY_UTIL_COMBINE_IF_HPP
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#define BOOST_GEOMETRY_UTIL_COMBINE_IF_HPP
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#include <boost/mpl/fold.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/bind.hpp>
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#include <boost/mpl/set.hpp>
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#include <boost/mpl/insert.hpp>
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#include <boost/mpl/placeholders.hpp>
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namespace boost { namespace geometry
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{
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namespace util
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{
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/*!
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\brief Meta-function to generate all the combination of pairs of types
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from a given sequence Sequence except those that does not satisfy the
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predicate Pred
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\ingroup utility
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\par Example
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\code
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typedef boost::mpl::vector<boost::mpl::int_<0>, boost::mpl::int_<1> > types;
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typedef combine_if<types, types, always<true_> >::type combinations;
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typedef boost::mpl::vector<
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pair<boost::mpl::int_<1>, boost::mpl::int_<1> >,
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pair<boost::mpl::int_<1>, boost::mpl::int_<0> >,
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pair<boost::mpl::int_<0>, boost::mpl::int_<1> >,
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pair<boost::mpl::int_<0>, boost::mpl::int_<0> >
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> result_types;
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BOOST_MPL_ASSERT(( boost::mpl::equal<combinations, result_types> ));
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\endcode
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*/
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template <typename Sequence1, typename Sequence2, typename Pred>
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struct combine_if
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{
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struct combine
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{
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template <typename Result, typename T>
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struct apply
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{
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typedef typename boost::mpl::fold<Sequence2, Result,
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boost::mpl::if_
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<
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boost::mpl::bind
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<
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typename boost::mpl::lambda<Pred>::type,
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T,
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boost::mpl::_2
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>,
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boost::mpl::insert
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<
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boost::mpl::_1, boost::mpl::pair<T, boost::mpl::_2>
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>,
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boost::mpl::_1
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>
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>::type type;
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};
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};
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typedef typename boost::mpl::fold
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<
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Sequence1, boost::mpl::set0<>, combine
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>::type type;
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};
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} // namespace util
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_UTIL_COMBINE_IF_HPP
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