libs/iostreams/test/buffer_size_test.cpp

   1 // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
   2 // (C) Copyright 2004-2007 Jonathan Turkanis
   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 // See http://www.boost.org/libs/iostreams for documentation.
   7
   8 #include "detail/filters.hpp"  // Must come before operations.hpp for VC6.
   9 #include <boost/iostreams/categories.hpp>
  10 #include <boost/iostreams/constants.hpp>
  11 #include <boost/iostreams/device/null.hpp>
  12 #include <boost/iostreams/operations.hpp>
  13 #include <boost/test/test_tools.hpp>
  14 #include <boost/test/unit_test.hpp>
  15
  16 using namespace std;
  17 using namespace boost::iostreams;
  18 using namespace boost::iostreams::test;
  19 using boost::unit_test::test_suite;
  20
  21 struct optimally_buffered_filter {
  22     typedef char char_type;
  23     struct category
  24         : input_filter_tag,
  25           optimally_buffered_tag
  26         { };
  27     std::streamsize optimal_buffer_size() const
  28     { return default_filter_buffer_size + 1; }
  29 };
  30
  31 void buffer_size_test()
  32 {
  33     // Test   device buffer sizes.
  34
  35     BOOST_CHECK_MESSAGE(
  36       optimal_buffer_size(null_source()) == default_device_buffer_size,
  37       "wrong buffer size for sourcer"
  38     );
  39     BOOST_CHECK_MESSAGE(
  40       optimal_buffer_size(null_sink()) == default_device_buffer_size,
  41       "wrong buffer size for sink"
  42     );
  43
  44     // Test   filter buffer sizes.
  45
  46     BOOST_CHECK_MESSAGE(
  47       optimal_buffer_size(toupper_filter()) == default_filter_buffer_size,
  48       "wrong buffer size for input filter"
  49     );
  50     BOOST_CHECK_MESSAGE(
  51       optimal_buffer_size(tolower_filter()) == default_filter_buffer_size,
  52       "wrong buffer size for output filter"
  53     );
  54     BOOST_CHECK_MESSAGE(
  55       optimal_buffer_size(toupper_multichar_filter())
  56           ==
  57       default_filter_buffer_size,
  58       "wrong buffer size for multi-character input filter"
  59     );
  60     BOOST_CHECK_MESSAGE(
  61       optimal_buffer_size(tolower_multichar_filter())
  62           ==
  63       default_filter_buffer_size,
  64       "wrong buffer size for multi-character output filter"
  65     );
  66
  67     // Test   custom buffer size.
  68
  69     BOOST_CHECK_MESSAGE(
  70       optimal_buffer_size(optimally_buffered_filter())
  71           ==
  72       optimally_buffered_filter().optimal_buffer_size(),
  73       "wrong buffer size for multi-character output filter"
  74     );
  75 }
  76
  77 test_suite* init_unit_test_suite(int, char* [])
  78 {
  79     test_suite* test = BOOST_TEST_SUITE("buffer_size test");
  80     test->add(BOOST_TEST_CASE(&buffer_size_test));
  81     return test;
  82 }