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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
// This file was modified by Oracle on 2017-2023.
// Modifications copyright (c) 2017-2023, Oracle and/or its affiliates.
// Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
// Contributed and/or modified by Adam Wulkiewicz, 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_STRATEGIES_COMPARE_HPP
#define BOOST_GEOMETRY_STRATEGIES_COMPARE_HPP
#include <algorithm>
#include <cstddef>
#include <functional>
#include <boost/geometry/core/access.hpp>
#include <boost/geometry/core/cs.hpp>
#include <boost/geometry/core/coordinate_type.hpp>
#include <boost/geometry/core/coordinate_dimension.hpp>
#include <boost/geometry/core/static_assert.hpp>
#include <boost/geometry/util/math.hpp>
namespace boost { namespace geometry
{
namespace strategy { namespace compare
{
struct less
{
template <typename T1, typename T2>
static inline bool apply(T1 const& l, T2 const& r)
{
return l < r;
}
};
struct greater
{
template <typename T1, typename T2>
static inline bool apply(T1 const& l, T2 const& r)
{
return l > r;
}
};
struct equal_to
{
template <typename T1, typename T2>
static inline bool apply(T1 const& , T2 const& )
{
return false;
}
};
struct equals_epsilon
{
template <typename T1, typename T2>
static inline bool apply(T1 const& l, T2 const& r)
{
return math::equals(l, r);
}
};
struct equals_exact
{
template <typename T1, typename T2>
static inline bool apply(T1 const& l, T2 const& r)
{
return l == r;
}
};
#ifndef DOXYGEN_NO_DETAIL
namespace detail
{
template
<
typename ComparePolicy,
typename EqualsPolicy,
std::size_t Dimension,
std::size_t DimensionCount
>
struct compare_loop
{
template <typename Point1, typename Point2>
static inline bool apply(Point1 const& left, Point2 const& right)
{
typename geometry::coordinate_type<Point1>::type const&
cleft = geometry::get<Dimension>(left);
typename geometry::coordinate_type<Point2>::type const&
cright = geometry::get<Dimension>(right);
if (EqualsPolicy::apply(cleft, cright))
{
return compare_loop
<
ComparePolicy,
EqualsPolicy,
Dimension + 1, DimensionCount
>::apply(left, right);
}
else
{
return ComparePolicy::apply(cleft, cright);
}
}
};
template
<
typename ComparePolicy,
typename EqualsPolicy,
std::size_t DimensionCount
>
struct compare_loop<ComparePolicy, EqualsPolicy, DimensionCount, DimensionCount>
{
template <typename Point1, typename Point2>
static inline bool apply(Point1 const& , Point2 const& )
{
// On coming here, points are equal.
// Return false for less/greater.
return false;
}
};
template
<
typename EqualsPolicy,
std::size_t DimensionCount
>
struct compare_loop<strategy::compare::equal_to, EqualsPolicy, DimensionCount, DimensionCount>
{
template <typename Point1, typename Point2>
static inline bool apply(Point1 const& , Point2 const& )
{
// On coming here, points are equal.
// Return true for equal_to.
return true;
}
};
} // namespace detail
#endif // DOXYGEN_NO_DETAIL
template
<
typename ComparePolicy,
typename EqualsPolicy,
int Dimension = -1
>
struct cartesian
{
template <typename Point1, typename Point2>
static inline bool apply(Point1 const& left, Point2 const& right)
{
return compare::detail::compare_loop
<
ComparePolicy, EqualsPolicy, Dimension, Dimension + 1
>::apply(left, right);
}
};
#ifndef DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
template
<
typename ComparePolicy,
typename EqualsPolicy
>
struct cartesian<ComparePolicy, EqualsPolicy, -1>
{
template <typename Point1, typename Point2>
static inline bool apply(Point1 const& left, Point2 const& right)
{
return compare::detail::compare_loop
<
ComparePolicy,
EqualsPolicy,
0,
((std::min)(geometry::dimension<Point1>::value,
geometry::dimension<Point2>::value))
>::apply(left, right);
}
};
#endif // DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
namespace services
{
template
<
typename ComparePolicy,
typename EqualsPolicy,
typename Point1,
typename Point2 = Point1,
int Dimension = -1,
typename CSTag1 = typename cs_tag<Point1>::type,
typename CSTag2 = typename cs_tag<Point2>::type
>
struct default_strategy
{
BOOST_GEOMETRY_STATIC_ASSERT_FALSE(
"Not implemented for these types.",
CSTag1, CSTag2);
};
template
<
typename ComparePolicy,
typename EqualsPolicy,
typename Point1,
typename Point2,
int Dimension
>
struct default_strategy<ComparePolicy, EqualsPolicy, Point1, Point2, Dimension, cartesian_tag, cartesian_tag>
{
typedef compare::cartesian<ComparePolicy, EqualsPolicy, Dimension> type;
};
} // namespace services
}} // namespace strategy compare
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_STRATEGIES_COMPARE_HPP
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