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