// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2014, Oracle and/or its affiliates.
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// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
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// Licensed under the Boost Software License version 1.0.
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// http://www.boost.org/users/license.html
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#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_CHECK_ITERATOR_RANGE_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_CHECK_ITERATOR_RANGE_HPP
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#include <boost/core/ignore_unused.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail
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{
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// Check whether (each element of) an iterator range satisfies a given
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// predicate.
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// The predicate must be implemented as having a static apply unary
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// method that returns a bool.
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// By default an empty range is accepted
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template <typename Predicate, bool AllowEmptyRange = true>
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struct check_iterator_range
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{
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template <typename InputIterator>
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static inline bool apply(InputIterator first, InputIterator beyond)
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{
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for (InputIterator it = first; it != beyond; ++it)
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{
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if (! Predicate::apply(*it))
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{
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return false;
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}
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}
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return AllowEmptyRange || first != beyond;
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}
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// version where we can pass a predicate object
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template <typename InputIterator>
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static inline bool apply(InputIterator first,
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InputIterator beyond,
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Predicate const& predicate)
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{
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// in case predicate's apply method is static, MSVC will
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// complain that predicate is not used
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boost::ignore_unused(predicate);
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for (InputIterator it = first; it != beyond; ++it)
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{
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if (! predicate.apply(*it))
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{
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return false;
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}
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}
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return AllowEmptyRange || first != beyond;
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}
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};
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} // namespace detail
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#endif // DOXYGEN_NO_DETAIL
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_CHECK_ITERATOR_RANGE_HPP
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