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