ceph/src/boost/libs/geometry/include/boost/geometry/iterators/has_one_element.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2014, Oracle and/or its affiliates.
   4
   5 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
   6
   7 // Licensed under the Boost Software License version 1.0.
   8 // http://www.boost.org/users/license.html
   9
  10 #ifndef BOOST_GEOMETRY_ITERATORS_HAS_ONE_ELEMENT_HPP
  11 #define BOOST_GEOMETRY_ITERATORS_HAS_ONE_ELEMENT_HPP
  12
  13
  14 namespace boost { namespace geometry
  15 {
  16
  17
  18 // free function to test if an iterator range has a single element
  19 template <typename Iterator>
  20 inline bool has_one_element(Iterator first, Iterator beyond)
  21 {
  22     return first != beyond && ++first == beyond;
  23 }
  24
  25
  26 }} // namespace boost::geometry
  27
  28
  29 #endif // BOOST_GEOMETRY_ITERATORS_HAS_ONE_ELEMENT_HPP