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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2014-2023, Oracle and/or its affiliates.
// Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
// Licensed under the Boost Software License version 1.0.
// http://www.boost.org/users/license.html
#ifndef BOOST_GEOMETRY_ALGORITHMS_POLICIES_PREDICATE_BASED_INTERRUPT_POLICY_HPP
#define BOOST_GEOMETRY_ALGORITHMS_POLICIES_PREDICATE_BASED_INTERRUPT_POLICY_HPP
#include <algorithm>
#include <boost/range/begin.hpp>
#include <boost/range/empty.hpp>
#include <boost/range/end.hpp>
namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace overlay
{
template
<
typename IsAcceptableTurnPredicate,
bool AllowEmptyTurnRange = true // by default, allow an empty turn range
>
struct stateless_predicate_based_interrupt_policy
{
static bool const enabled = true;
bool has_intersections; // set to true if there is at least one
// unacceptable turn
inline stateless_predicate_based_interrupt_policy()
: has_intersections(false)
{}
template <typename Range>
inline bool apply(Range const& range)
{
// if there is at least one unacceptable turn in the range, return true
bool const has_unacceptable_turn = std::any_of(boost::begin(range), boost::end(range),
[](auto const& turn) {
return ! IsAcceptableTurnPredicate::apply(turn);
});
has_intersections = has_unacceptable_turn
&& !(AllowEmptyTurnRange && boost::empty(range));
return has_intersections;
}
};
template
<
typename IsAcceptableTurnPredicate,
bool AllowEmptyTurnRange = true // by default, allow an empty turn range
>
struct predicate_based_interrupt_policy
{
static bool const enabled = true;
bool has_intersections; // set to true if there is at least one
// unacceptable turn
IsAcceptableTurnPredicate const& m_predicate;
inline
predicate_based_interrupt_policy(IsAcceptableTurnPredicate const& predicate)
: has_intersections(false)
, m_predicate(predicate)
{}
template <typename Range>
inline bool apply(Range const& range)
{
// if there is at least one unacceptable turn in the range, return true
bool const has_unacceptable_turn = std::any_of(boost::begin(range),
boost::end(range),
[&]( auto const& turn ) {
return ! m_predicate.apply(turn);
});
has_intersections = has_unacceptable_turn
&& !(AllowEmptyTurnRange && boost::empty(range));
return has_intersections;
}
};
}} // namespace detail::overlay
#endif // DOXYGEN_NO_DETAIL
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_POLICIES_PREDICATE_BASED_INTERRUPT_POLICY_HPP
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