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View File Name : has_nan_coordinate.hpp

// Boost.Geometry

// Copyright (c) 2015-2020 Oracle and/or its affiliates.

// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle

// 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_HAS_NAN_COORDINATE_HPP
#define BOOST_GEOMETRY_UTIL_HAS_NAN_COORDINATE_HPP

#include <cstddef>
#include <type_traits>

#include <boost/geometry/core/access.hpp>
#include <boost/geometry/core/coordinate_dimension.hpp>
#include <boost/geometry/core/coordinate_type.hpp>

#include <boost/math/special_functions/fpclassify.hpp>


namespace boost { namespace geometry
{
    
#ifndef DOXYGEN_NO_DETAIL
namespace detail
{

struct isnan
{
    template <typename T>
    static inline bool apply(T const& t)
    {
        return boost::math::isnan(t);
    }
};

template
<
    typename Point,
    typename Predicate,
    bool Enable,
    std::size_t I = 0,
    std::size_t N = geometry::dimension<Point>::value
>
struct has_coordinate_with_property
{
    static bool apply(Point const& point)
    {
        return Predicate::apply(geometry::get<I>(point))
            || has_coordinate_with_property
                <
                    Point, Predicate, Enable, I+1, N
                >::apply(point);
    }
};

template <typename Point, typename Predicate, std::size_t I, std::size_t N>
struct has_coordinate_with_property<Point, Predicate, false, I, N>
{
    static inline bool apply(Point const&)
    {
        return false;
    }
};

template <typename Point, typename Predicate, std::size_t N>
struct has_coordinate_with_property<Point, Predicate, true, N, N>
{
    static bool apply(Point const& )
    {
        return false;
    }
};

} // namespace detail
#endif // DOXYGEN_NO_DETAIL

template <typename Point>
bool has_nan_coordinate(Point const& point)
{
    return detail::has_coordinate_with_property
        <
            Point,
            detail::isnan,
            std::is_floating_point
                <
                    typename coordinate_type<Point>::type
                >::value
        >::apply(point);
}

}} // namespace boost::geometry

#endif // BOOST_GEOMETRY_UTIL_HAS_NAN_COORDINATE_HPP