ceph/src/boost/libs/spirit/test/support/istream_iterator_basic.cpp

   1 //  Copyright (c) 2016 Jeffrey E. Trull
   2 //
   3 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 // A series of simple tests for the istream_iterator
   7
   8 #include <boost/detail/lightweight_test.hpp>
   9
  10 #include <sstream>
  11
  12 #include <boost/spirit/include/support_istream_iterator.hpp>
  13
  14 int main()
  15 {
  16   std::stringstream ss("HELO\n");
  17   boost::spirit::istream_iterator it(ss);
  18
  19   // Check iterator concepts
  20   boost::spirit::istream_iterator it2(it);  // CopyConstructible
  21   BOOST_TEST( it2 == it );                  // EqualityComparable
  22   BOOST_TEST( *it2 == 'H' );
  23
  24   boost::spirit::istream_iterator end;      // DefaultConstructible
  25   BOOST_TEST( it != end );
  26   it = end;                                 // CopyAssignable
  27   BOOST_TEST( it == end );
  28
  29   std::swap(it, it2);                       // Swappable
  30   BOOST_TEST( it2 == end );
  31   BOOST_TEST( *it == 'H' );
  32
  33   ++it;
  34   BOOST_TEST( *it == 'E' );
  35   BOOST_TEST( *it++ == 'E' );
  36
  37   // "Incrementing a copy of a does not change the value read from a"
  38   boost::spirit::istream_iterator it3 = it;
  39   BOOST_TEST( *it == 'L' );
  40   BOOST_TEST( *it3 == 'L' );
  41   ++it;
  42   BOOST_TEST( *it == 'O' );
  43   BOOST_TEST( *it3 == 'L' );
  44
  45   it3 = it;
  46   // "a == b implies ++a == ++b"
  47   BOOST_TEST( ++it3 == ++it );
  48
  49   // Usage of const iterators
  50   boost::spirit::istream_iterator const itc = it;
  51   BOOST_TEST( itc == it );
  52   BOOST_TEST( *itc == *it );
  53   ++it;
  54   BOOST_TEST( itc != it );
  55
  56   // Skipping le/gt comparisons as unclear what they are for in forward iterators...
  57
  58   return boost::report_errors();
  59 }
  60 // Destructible