iterators/detail/has_one_element.hpp

0001 // Boost.Geometry
0002
0003 // Copyright (c) 2014-2021, Oracle and/or its affiliates.
0004 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
0005 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
0006
0007 // Licensed under the Boost Software License version 1.0.
0008 // http://www.boost.org/users/license.html
0009
0010 #ifndef BOOST_GEOMETRY_ITERATORS_DETAIL_HAS_ONE_ELEMENT_HPP
0011 #define BOOST_GEOMETRY_ITERATORS_DETAIL_HAS_ONE_ELEMENT_HPP
0012
0013
0014 namespace boost { namespace geometry { namespace detail
0015 {
0016
0017
0018 // free function to test if an iterator range has a single element
0019 template <typename Iterator>
0020 inline bool has_one_element(Iterator first, Iterator last)
0021 {
0022     return first != last && ++first == last;
0023 }
0024
0025
0026 }}} // namespace boost::geometry::detail
0027
0028
0029 #endif // BOOST_GEOMETRY_ITERATORS_DETAIL_HAS_ONE_ELEMENT_HPP