ceph/src/boost/libs/range/test/compile_fail/adaptor/adjacent_filtered_concept4.cpp

   1 // Boost.Range library
   2 //
   3 // Copyright Neil Groves 2014. Use, modification and distribution is subject
   4 // to the Boost Software License, Version 1.0. (See accompanying file
   5 // LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8 // For more information, see http://www.boost.org/libs/range
   9 //
  10
  11 #include "mock_range.hpp"
  12 #include <boost/range/adaptor/adjacent_filtered.hpp>
  13
  14 namespace
  15 {
  16
  17 struct always_true
  18 {
  19     typedef bool result_type;
  20
  21     bool operator()(int, int) const
  22     {
  23         return true;
  24     }
  25 };
  26
  27 } // anonymous namespace
  28
  29 int main(int, const char**)
  30 {
  31     using boost::range::unit_test::mock_const_range;
  32     using boost::adaptors::adjacent_filter;
  33
  34     // This next line should fail when Boost.Range concept checking is
  35     // enabled since the adjacent_filtered adaptor takes at least a
  36     // ForwardRange.
  37     return adjacent_filter(
  38             mock_const_range<boost::single_pass_traversal_tag>(),
  39             always_true()).front();
  40 }