diff --git a/example/example_test.cpp b/example/example_test.cpp
new file mode 100755
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+++ b/example/example_test.cpp
@@ -0,0 +1,497 @@
+// (C) Copyright Jonathan Turkanis 2005.
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
+
+// See http://www.boost.org/libs/iostreams for documentation.
+
+#include <ios>  // failure.
+#include <map>
+#include <boost/iostreams/filter/test.hpp>
+#include <boost/mpl/vector.hpp>
+#include <boost/test/test_tools.hpp>
+#include <boost/test/unit_test.hpp>
+#include "./dictionary_filter.hpp"
+//#include "./finite_state_filter.hpp"
+#include "./line_wrapping_filter.hpp"
+#include "./shell_comments_filter.hpp"
+#include "./tab_expanding_filter.hpp"
+#include "./unix2dos_filter.hpp"
+
+using boost::unit_test::test_suite;
+namespace io = boost::iostreams;
+namespace ex = boost::iostreams::example;
+
+#include <boost/iostreams/copy.hpp>
+#include <boost/iostreams/device/file.hpp>
+#include <boost/iostreams/filtering_stream.hpp>
+#include <boost/range/iterator_range.hpp>
+#include <iostream>
+                    
+//------------------dictionary_filter test------------------------------------//
+
+void dictionary_filter_test()
+{
+    using namespace std;
+
+    io::example::dictionary d;
+
+    // See http://english2american.com.
+    d.add("answerphone",  "answering machine");
+    d.add("bloke",        "guy");
+    d.add("gearbox",      "transmission");
+    d.add("ironmonger",   "hardware shop");
+    d.add("loo",          "restroom");
+    d.add("lorry",        "truck");
+    d.add("rubber",       "eraser");
+    d.add("spanner",      "monkey wrench");
+    d.add("telly",        "TV");
+    d.add("tyre",         "tire");
+    d.add("waistcoat",    "vest");
+    d.add("windscreen",   "windshield");
+
+    const std::string input =
+        "I had a message on my answerphone from the bloke at the car "
+        "dealership that the windscreen and tyre on my lorry were replaced. "
+        "However, the gearbox would not be ready until tomorrow since the "
+        "spanner that they needed was broken and they had to go to the "
+        "ironmonger to buy a replacement. Since my lorry was not ready, "
+        "I decided to take the bus downtown and buy a new waistcoat. I "
+        "also stopped at the liquor store to buy some wine. I came home "
+        "and watched the telly and drank my wine. I also worked on a "
+        "crossword puzzle. Fortunately I had a pencil with a new rubber. "
+        "During that evening I made frequent trips to the loo due to my "
+        "excessive drinking.";
+
+    const std::string output =
+        "I had a message on my answering machine from the guy at the car "
+        "dealership that the windshield and tire on my truck were replaced. "
+        "However, the transmission would not be ready until tomorrow since "
+        "the monkey wrench that they needed was broken and they had to go to "
+        "the hardware shop to buy a replacement. Since my truck was not ready, "
+        "I decided to take the bus downtown and buy a new vest. I also stopped "
+        "at the liquor store to buy some wine. I came home and watched the TV "
+        "and drank my wine. I also worked on a crossword puzzle. Fortunately I "
+        "had a pencil with a new eraser. During that evening I made frequent "
+        "trips to the restroom due to my excessive drinking.";
+
+    BOOST_CHECK(
+        io::test_input_filter( io::example::dictionary_stdio_filter(d),
+                               input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_output_filter( io::example::dictionary_stdio_filter(d),
+                                input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_input_filter( io::example::dictionary_input_filter(d),
+                               input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_output_filter( io::example::dictionary_output_filter(d),
+                                input, output )
+    );
+}
+
+//------------------finite_state_filter test----------------------------------//
+
+//struct dos2unix_filter 
+//    : ex::finite_state_filter_base<dos2unix_filter, char>
+//{
+//    typedef dos2unix_filter  self;
+//    typedef char             char_type;
+//
+//    static const int initial_state = 0;
+//    static const int found_cr = 1;
+//
+//    void on_cr(char) { }
+//    void on_any(char c) { push(c); }
+//    void on_error(char) 
+//    { 
+//        throw std::ios_base::failure("bad input");
+//    }
+//
+//    typedef boost::mpl::vector<
+//                rule<initial_state, ex::is< '\r' >, found_cr,      &self::on_cr>,
+//                rule<initial_state, ex::is< '\n' >, initial_state, &self::on_error>,
+//                rule<found_cr,      ex::is< '\n' >, initial_state, &self::on_any>,
+//                rule<found_cr,      ex::is_any,     initial_state, &self::on_error>
+//            > transition_table;
+//};
+//
+//void finite_state_filter_test()
+//{
+//    using namespace std;
+//
+//    const std::string input = 
+//        "When I was one-and-twenty\n"	
+//        "I heard a wise man say,\n"	
+//        "'Give crowns and pounds and guineas\n"	
+//        "But not your heart away;\n"	
+//        "\n"
+//        "Give pearls away and rubies\n"
+//        "But keep your fancy free.'\n"	
+//        "But I was one-and-twenty,\n"	
+//        "No use to talk to me.\n"	
+//        "\n" 
+//        "When I was one-and-twenty\n"	
+//        "I heard him say again,\n"
+//        "'The heart out of the bosom\n"	
+//        "Was never given in vain;\n"	
+//        "'Tis paid with sighs a plenty\n"
+//        "And sold for endless rue.'\n"
+//        "And I am two-and-twenty,\n"
+//        "And oh, 'tis true, 'tis true.";
+//
+//    const std::string output =
+//        "When I was one-and-twenty\r\n"	
+//        "I heard a wise man say,\r\n"	
+//        "'Give crowns and pounds and guineas\r\n"	
+//        "But not your heart away;\r\n"	
+//        "\r\n"
+//        "Give pearls away and rubies\r\n"
+//        "But keep your fancy free.'\r\n"	
+//        "But I was one-and-twenty,\r\n"	
+//        "No use to talk to me.\r\n"	
+//        "\r\n" 
+//        "When I was one-and-twenty\r\n"	
+//        "I heard him say again,\r\n"
+//        "'The heart out of the bosom\r\n"	
+//        "Was never given in vain;\r\n"	
+//        "'Tis paid with sighs a plenty\r\n"
+//        "And sold for endless rue.'\r\n"
+//        "And I am two-and-twenty,\r\n"
+//        "And oh, 'tis true, 'tis true.";
+//
+//    typedef ex::finite_state_stdio_filter<dos2unix_filter> dos2unix_stdio_filter;
+//
+//    BOOST_CHECK(
+//        io::test_input_filter(dos2unix_stdio_filter(), input, output)
+//    );
+//
+//    //BOOST_CHECK(
+//    //    io::test_output_filter( io::example::finite_state_stdio_filter(),
+//    //                            input, output )
+//    //);
+//
+//    //BOOST_CHECK(
+//    //    io::test_input_filter( io::example::finite_state_input_filter(),
+//    //                           input, output )
+//    //);
+//
+//    //BOOST_CHECK(
+//    //    io::test_output_filter( io::example::finite_state_output_filter(),
+//    //                            input, output )
+//    //);
+//}
+                    
+//------------------line_wrapping_filter test---------------------------------//
+
+void line_wrapping_filter_test()
+{
+    using namespace std;
+
+    const std::string input =
+        "I had a message on my answerphone from the bloke at the car \n"
+        "dealership that the windscreen and tyre on my lorry were replaced. \n"
+        "However, the gearbox would not be ready until tomorrow since the \n"
+        "spanner that they needed was broken and they had to go to the \n"
+        "ironmonger to buy a replacement. Since my lorry was not ready, \n"
+        "I decided to take the bus downtown and buy a new waistcoat. I \n"
+        "also stopped at the liquor store to buy some wine. I came home \n"
+        "and watched the telly and drank my wine. I also worked on a \n"
+        "crossword puzzle. Fortunately I had a pencil with a new rubber. \n"
+        "During that evening I made frequent trips to the loo due to my \n"
+        "excessive drinking.";
+
+    const std::string output =
+        "I had a message on my answerphone from t\n"
+        "he bloke at the car \n"
+        "dealership that the windscreen and tyre \n"
+        "on my lorry were replaced. \n"
+        "However, the gearbox would not be ready \n"
+        "until tomorrow since the \n"
+        "spanner that they needed was broken and \n"
+        "they had to go to the \n"
+        "ironmonger to buy a replacement. Since m\n"
+        "y lorry was not ready, \n"
+        "I decided to take the bus downtown and b\n"
+        "uy a new waistcoat. I \n"
+        "also stopped at the liquor store to buy \n"
+        "some wine. I came home \n"
+        "and watched the telly and drank my wine.\n"
+        " I also worked on a \n"
+        "crossword puzzle. Fortunately I had a pe\n"
+        "ncil with a new rubber. \n"
+        "During that evening I made frequent trip\n"
+        "s to the loo due to my \n"
+        "excessive drinking.";
+
+    BOOST_CHECK(
+        io::test_input_filter( io::example::line_wrapping_stdio_filter(40),
+                               input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_output_filter( io::example::line_wrapping_stdio_filter(40),
+                                input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_input_filter( io::example::line_wrapping_input_filter(40),
+                               input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_output_filter( io::example::line_wrapping_output_filter(40),
+                                input, output )
+    );
+}
+
+//------------------shell_comments_filter test--------------------------------//
+
+void shell_comments_filter_test()
+{
+    using namespace std;
+
+    const std::string input = // From <libs/filesystem/build/Jamfile>.
+        "lib boost_filesystem\n"
+        "     : ../src/$(SOURCES).cpp\n"
+        "     : # build requirements\n"
+        "       [ common-names ] # magic for install and auto-link features\n"
+        "       <include>$(BOOST_ROOT) <sysinclude>$(BOOST_ROOT)\n"
+        "       <no-warn>exception.cpp <no-warn>operations_posix_windows.cpp\n"
+        "     : debug release  # build variants\n"
+        "     ;\n"
+        "\n"
+        "dll boost_filesystem\n"
+        "     : ../src/$(SOURCES).cpp\n"
+        "     : # build requirements\n"
+        "       [ common-names ]  # magic for install and auto-link features\n"
+        "       <define>BOOST_FILESYSTEM_DYN_LINK=1  # tell source we're building dll's\n"
+        "       <runtime-link>dynamic  # build only for dynamic runtimes\n"
+        "       <include>$(BOOST_ROOT) <sysinclude>$(BOOST_ROOT)\n"
+        "       <no-warn>exception.cpp <no-warn>operations_posix_windows.cpp\n"
+        "     : debug release  # build variants\n"
+        "     ;";
+
+    const std::string output =
+        "lib boost_filesystem\n"
+        "     : ../src/$(SOURCES).cpp\n"
+        "     : \n"
+        "       [ common-names ] \n"
+        "       <include>$(BOOST_ROOT) <sysinclude>$(BOOST_ROOT)\n"
+        "       <no-warn>exception.cpp <no-warn>operations_posix_windows.cpp\n"
+        "     : debug release  \n"
+        "     ;\n"
+        "\n"
+        "dll boost_filesystem\n"
+        "     : ../src/$(SOURCES).cpp\n"
+        "     : \n"
+        "       [ common-names ]  \n"
+        "       <define>BOOST_FILESYSTEM_DYN_LINK=1  \n"
+        "       <runtime-link>dynamic  \n"
+        "       <include>$(BOOST_ROOT) <sysinclude>$(BOOST_ROOT)\n"
+        "       <no-warn>exception.cpp <no-warn>operations_posix_windows.cpp\n"
+        "     : debug release  \n"
+        "     ;";
+
+    BOOST_CHECK(
+        io::test_input_filter( io::example::shell_comments_stdio_filter(),
+                               input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_output_filter( io::example::shell_comments_stdio_filter(),
+                                input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_input_filter( io::example::shell_comments_input_filter(),
+                               input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_output_filter( io::example::shell_comments_output_filter(),
+                                input, output )
+    );
+}
+
+//------------------tab_expanding_filter test---------------------------------//
+
+void tab_expanding_filter_test()
+{
+    using namespace std;
+
+    const std::string input =
+        "class tab_expanding_stdio_filter : public stdio_filter {\n"
+        "public:\n"
+        "\texplicit tab_expanding_stdio_filter(int\ttab_size = 8)\n"
+        "\t\t: tab_size_(tab_size), col_no_(0)\n"
+        "\t{\n"
+        "\t\tassert(tab_size\t> 0);\n"
+        "\t}\n"
+        "private:\n"
+        "\tvoid do_filter()\n"
+        "\t{\n"
+        "\t\tint\tc;\n"
+        "\t\twhile ((c = std::cin.get()) != EOF) {\n"
+        "\t\t\tif (c == '\\t') {\n"
+        "\t\t\t\tint\tspaces = tab_size_ - (col_no_ %\ttab_size_);\n"
+        "\t\t\t\tfor\t(; spaces >\t0; --spaces)\n"
+        "\t\t\t\t\tput_char(' ');\n"
+        "\t\t\t} else {\n"
+        "\t\t\t\tput_char(c);\n"
+        "\t\t\t}\n"
+        "\t\t}\n"
+        "\t}\n"
+        "\tvoid do_close()\t{ col_no_ =\t0; }\n"
+        "\tvoid put_char(int c)\n"
+        "\t{\n"
+        "\t\tstd::cout.put(c);\n"
+        "\t\tif (c == '\\n') {\n"
+        "\t\t\tcol_no_\t= 0;\n"
+        "\t\t} else {\n"
+        "\t\t\t++col_no_;\n"
+        "\t\t}\n"
+        "\t}\n"
+        "\tint\t tab_size_;\n"
+        "\tint\t col_no_;\n"
+        "};";
+
+    const std::string output =
+        "class tab_expanding_stdio_filter : public stdio_filter {\n"
+        "public:\n"
+        "    explicit tab_expanding_stdio_filter(int tab_size = 8)\n"
+        "        : tab_size_(tab_size), col_no_(0)\n"
+        "    {\n"
+        "        assert(tab_size > 0);\n"
+        "    }\n"
+        "private:\n"
+        "    void do_filter()\n"
+        "    {\n"
+        "        int c;\n"
+        "        while ((c = std::cin.get()) != EOF) {\n"
+        "            if (c == '\\t') {\n"
+        "                int spaces = tab_size_ - (col_no_ % tab_size_);\n"
+        "                for (; spaces > 0; --spaces)\n"
+        "                    put_char(' ');\n"
+        "            } else {\n"
+        "                put_char(c);\n"
+        "            }\n"
+        "        }\n"
+        "    }\n"
+        "    void do_close() { col_no_ = 0; }\n"
+        "    void put_char(int c)\n"
+        "    {\n"
+        "        std::cout.put(c);\n"
+        "        if (c == '\\n') {\n"
+        "            col_no_ = 0;\n"
+        "        } else {\n"
+        "            ++col_no_;\n"
+        "        }\n"
+        "    }\n"
+        "    int  tab_size_;\n"
+        "    int  col_no_;\n"
+        "};";
+
+    BOOST_CHECK(
+        io::test_input_filter( io::example::tab_expanding_stdio_filter(4),
+                               input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_output_filter( io::example::tab_expanding_stdio_filter(4),
+                                input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_input_filter( io::example::tab_expanding_input_filter(4),
+                               input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_output_filter( io::example::tab_expanding_output_filter(4),
+                                input, output )
+    );
+}
+
+//------------------unix2dos_filter test--------------------------------------//
+
+void unix2dos_filter_test()
+{
+    using namespace std;
+
+    const std::string input = 
+        "When I was one-and-twenty\n"	
+        "I heard a wise man say,\n"	
+        "'Give crowns and pounds and guineas\n"	
+        "But not your heart away;\n"	
+        "\n"
+        "Give pearls away and rubies\n"
+        "But keep your fancy free.'\n"	
+        "But I was one-and-twenty,\n"	
+        "No use to talk to me.\n"	
+        "\n" 
+        "When I was one-and-twenty\n"	
+        "I heard him say again,\n"
+        "'The heart out of the bosom\n"	
+        "Was never given in vain;\n"	
+        "'Tis paid with sighs a plenty\n"
+        "And sold for endless rue.'\n"
+        "And I am two-and-twenty,\n"
+        "And oh, 'tis true, 'tis true.";
+
+    const std::string output =
+        "When I was one-and-twenty\r\n"	
+        "I heard a wise man say,\r\n"	
+        "'Give crowns and pounds and guineas\r\n"	
+        "But not your heart away;\r\n"	
+        "\r\n"
+        "Give pearls away and rubies\r\n"
+        "But keep your fancy free.'\r\n"	
+        "But I was one-and-twenty,\r\n"	
+        "No use to talk to me.\r\n"	
+        "\r\n" 
+        "When I was one-and-twenty\r\n"	
+        "I heard him say again,\r\n"
+        "'The heart out of the bosom\r\n"	
+        "Was never given in vain;\r\n"	
+        "'Tis paid with sighs a plenty\r\n"
+        "And sold for endless rue.'\r\n"
+        "And I am two-and-twenty,\r\n"
+        "And oh, 'tis true, 'tis true.";
+
+    BOOST_CHECK(
+        io::test_input_filter( io::example::unix2dos_stdio_filter(),
+                               input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_output_filter( io::example::unix2dos_stdio_filter(),
+                                input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_input_filter( io::example::unix2dos_input_filter(),
+                               input, output )
+    );
+
+    BOOST_CHECK(
+        io::test_output_filter( io::example::unix2dos_output_filter(),
+                                input, output )
+    );
+}
+
+test_suite* init_unit_test_suite(int, char* []) 
+{
+    test_suite* test BOOST_TEST_SUITE("example test");
+    test->add(BOOST_TEST_CASE(&dictionary_filter_test));
+    test->add(BOOST_TEST_CASE(&tab_expanding_filter_test));
+    test->add(BOOST_TEST_CASE(&line_wrapping_filter_test));
+    test->add(BOOST_TEST_CASE(&shell_comments_filter_test));
+    test->add(BOOST_TEST_CASE(&unix2dos_filter_test));
+    return test;
+}