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POC++ compiler gives pages of warnings when using boost::xpressive
 

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  1. POC++ compiler gives pages of warnings when using boost::xpressive
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    <p>I get a long list of compile warnings when trying to use <code>boost::xpressive</code>; specifically when I use <code>sregex_compiler</code>'s <code>compile()</code> function.</p> <p>I followed the <a href="http://www.boost.org/doc/libs/1_43_0/doc/html/xpressive/user_s_guide.html#boost_xpressive.user_s_guide.quick_start" rel="nofollow">documentation</a> and put together this small program:</p> <pre><code>#include &lt;iostream&gt; #include &lt;boost/xpressive/xpressive.hpp&gt; using namespace std; int main (int argc, char **argv) { bool matchResult; boost::xpressive::sregex_compiler compiler; boost::xpressive::sregex re; string str("hello world"); re = compiler.compile("hello"); // &lt;-- this line causes warnings matchResult = boost::xpressive::regex_search(str, re); cout &lt;&lt; "match result = " &lt;&lt; matchResult &lt;&lt; endl; return 0; } </code></pre> <p>When I compile, I get this long stack of warnings:</p> <pre><code>$ g++ -I /usr/local/include -o simple xpressive_simple.cc /usr/local/include/boost/xpressive/detail/core/matcher/alternate_matcher.hpp: In instantiation of 'boost::xpressive::detail::alternate_matcher&lt;boost::xpressive::detail::alternates_vector&lt;__gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt; &gt;, boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt;': /usr/local/include/boost/xpressive/regex_compiler.hpp:284: instantiated from 'boost::xpressive::detail::sequence&lt;BidiIter&gt; boost::xpressive::regex_compiler&lt;BidiIter, RegexTraits, CompilerTraits&gt;::parse_alternates(FwdIter&amp;, FwdIter) [with FwdIter = const char*, BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, RegexTraits = boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, CompilerTraits = boost::xpressive::compiler_traits&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt;]' /usr/local/include/boost/xpressive/regex_compiler.hpp:212: instantiated from 'boost::xpressive::basic_regex&lt;BidiIter&gt; boost::xpressive::regex_compiler&lt;BidiIter, RegexTraits, CompilerTraits&gt;::compile_(FwdIter, FwdIter, boost::xpressive::regex_constants::syntax_option_type, std::forward_iterator_tag) [with FwdIter = const char*, BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, RegexTraits = boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, CompilerTraits = boost::xpressive::compiler_traits&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt;]' /usr/local/include/boost/xpressive/regex_compiler.hpp:120: instantiated from 'boost::xpressive::basic_regex&lt;BidiIter&gt; boost::xpressive::regex_compiler&lt;BidiIter, RegexTraits, CompilerTraits&gt;::compile(InputIter, InputIter, boost::xpressive::regex_constants::syntax_option_type) [with InputIter = const char*, BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, RegexTraits = boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, CompilerTraits = boost::xpressive::compiler_traits&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt;]' /usr/local/include/boost/xpressive/regex_compiler.hpp:139: instantiated from 'boost::xpressive::basic_regex&lt;BidiIter&gt; boost::xpressive::regex_compiler&lt;BidiIter, RegexTraits, CompilerTraits&gt;::compile(const typename boost::iterator_value&lt;Iterator&gt;::type*, boost::xpressive::regex_constants::syntax_option_type) [with BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, RegexTraits = boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, CompilerTraits = boost::xpressive::compiler_traits&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt;]' xpressive_simple.cc:13: instantiated from here /usr/local/include/boost/xpressive/detail/core/matcher/alternate_matcher.hpp:88: warning: comparison between 'enum boost::xpressive::detail::alternates_vector&lt;__gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt; &gt;::&lt;anonymous&gt;' and 'enum mpl_::size_t&lt;1073741822ul&gt;::&lt;anonymous&gt;' /usr/local/include/boost/numeric/conversion/detail/meta.hpp: In instantiation of 'boost::numeric::convdetail::equal_to&lt;mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_unsigned&gt;, mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_signed&gt; &gt;': /usr/local/include/boost/mpl/if.hpp:67: instantiated from 'boost::mpl::if_&lt;boost::numeric::convdetail::equal_to&lt;mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_unsigned&gt;, mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_signed&gt; &gt;, boost::mpl::identity&lt;boost::numeric::convdetail::subranged_SameSign&lt;unsigned char, int&gt; &gt;, boost::mpl::eval_if&lt;boost::numeric::convdetail::equal_to&lt;mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_unsigned&gt;, mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_unsigned&gt; &gt;, boost::mpl::identity&lt;boost::numeric::convdetail::subranged_Sig2Unsig&lt;unsigned char, int&gt; &gt;, boost::mpl::if_&lt;boost::numeric::convdetail::equal_to&lt;mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_unsigned&gt;, mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, unsigned_to_signed&gt; &gt;, boost::numeric::convdetail::subranged_Unsig2Sig&lt;unsigned char, int&gt;, boost::numeric::convdetail::subranged_SameSign&lt;unsigned char, int&gt; &gt; &gt; &gt;' /usr/local/include/boost/mpl/eval_if.hpp:37: instantiated from 'boost::mpl::eval_if&lt;boost::numeric::convdetail::equal_to&lt;mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_unsigned&gt;, mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_signed&gt; &gt;, boost::mpl::identity&lt;boost::numeric::convdetail::subranged_SameSign&lt;unsigned char, int&gt; &gt;, boost::mpl::eval_if&lt;boost::numeric::convdetail::equal_to&lt;mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_unsigned&gt;, mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_unsigned&gt; &gt;, boost::mpl::identity&lt;boost::numeric::convdetail::subranged_Sig2Unsig&lt;unsigned char, int&gt; &gt;, boost::mpl::if_&lt;boost::numeric::convdetail::equal_to&lt;mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_unsigned&gt;, mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, unsigned_to_signed&gt; &gt;, boost::numeric::convdetail::subranged_Unsig2Sig&lt;unsigned char, int&gt;, boost::numeric::convdetail::subranged_SameSign&lt;unsigned char, int&gt; &gt; &gt; &gt;' /usr/local/include/boost/numeric/conversion/detail/meta.hpp:82: instantiated from 'boost::numeric::convdetail::ct_switch4&lt;mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_unsigned&gt;, mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_signed&gt;, mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_unsigned&gt;, mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, unsigned_to_signed&gt;, boost::numeric::convdetail::subranged_SameSign&lt;unsigned char, int&gt;, boost::numeric::convdetail::subranged_Sig2Unsig&lt;unsigned char, int&gt;, boost::numeric::convdetail::subranged_Unsig2Sig&lt;unsigned char, int&gt;, boost::numeric::convdetail::subranged_SameSign&lt;unsigned char, int&gt; &gt;' /usr/local/include/boost/numeric/conversion/detail/sign_mixture.hpp:63: instantiated from 'boost::numeric::convdetail::for_sign_mixture&lt;mpl_::integral_c&lt;boost::numeric::sign_mixture_enum, signed_to_unsigned&gt;, boost::numeric::convdetail::subranged_SameSign&lt;unsigned char, int&gt;, boost::numeric::convdetail::subranged_Sig2Unsig&lt;unsigned char, int&gt;, boost::numeric::convdetail::subranged_Unsig2Sig&lt;unsigned char, int&gt;, boost::numeric::convdetail::subranged_SameSign&lt;unsigned char, int&gt; &gt;' /usr/local/include/boost/numeric/conversion/detail/is_subranged.hpp:164: instantiated from 'boost::numeric::convdetail::get_subranged_Int2Int&lt;unsigned char, int&gt;' /usr/local/include/boost/numeric/conversion/detail/is_subranged.hpp:186: instantiated from 'boost::numeric::convdetail::get_subranged_BuiltIn2BuiltIn&lt;unsigned char, int&gt;' /usr/local/include/boost/numeric/conversion/detail/is_subranged.hpp:208: instantiated from 'boost::numeric::convdetail::get_subranged&lt;unsigned char, int&gt;' /usr/local/include/boost/numeric/conversion/detail/is_subranged.hpp:227: instantiated from 'boost::numeric::convdetail::get_is_subranged&lt;unsigned char, int&gt;' /usr/local/include/boost/numeric/conversion/detail/conversion_traits.hpp:37: instantiated from 'boost::numeric::convdetail::non_trivial_traits_impl&lt;unsigned char, int&gt;' /usr/local/include/boost/numeric/conversion/conversion_traits.hpp:23: instantiated from 'boost::numeric::conversion_traits&lt;unsigned char, int&gt;' /usr/local/include/boost/xpressive/detail/dynamic/parse_charset.hpp:85: instantiated from 'boost::xpressive::detail::escape_value&lt;typename boost::iterator_value&lt;Iterator&gt;::type, typename CompilerTraits::regex_traits::char_class_type&gt; boost::xpressive::detail::parse_escape(FwdIter&amp;, FwdIter, CompilerTraits&amp;) [with FwdIter = const char*, CompilerTraits = boost::xpressive::compiler_traits&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt;]' /usr/local/include/boost/xpressive/regex_compiler.hpp:726: instantiated from 'boost::xpressive::detail::escape_value&lt;typename boost::iterator_value&lt;Iterator&gt;::type, typename RegexTraits::char_class_type&gt; boost::xpressive::regex_compiler&lt;BidiIter, RegexTraits, CompilerTraits&gt;::parse_escape(FwdIter&amp;, FwdIter) [with FwdIter = const char*, BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, RegexTraits = boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, CompilerTraits = boost::xpressive::compiler_traits&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt;]' /usr/local/include/boost/xpressive/regex_compiler.hpp:522: instantiated from 'boost::xpressive::detail::sequence&lt;BidiIter&gt; boost::xpressive::regex_compiler&lt;BidiIter, RegexTraits, CompilerTraits&gt;::parse_atom(FwdIter&amp;, FwdIter) [with FwdIter = const char*, BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, RegexTraits = boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, CompilerTraits = boost::xpressive::compiler_traits&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt;]' /usr/local/include/boost/xpressive/regex_compiler.hpp:589: instantiated from 'boost::xpressive::detail::sequence&lt;BidiIter&gt; boost::xpressive::regex_compiler&lt;BidiIter, RegexTraits, CompilerTraits&gt;::parse_quant(FwdIter&amp;, FwdIter) [with FwdIter = const char*, BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, RegexTraits = boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, CompilerTraits = boost::xpressive::compiler_traits&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt;]' /usr/local/include/boost/xpressive/regex_compiler.hpp:622: instantiated from 'boost::xpressive::detail::sequence&lt;BidiIter&gt; boost::xpressive::regex_compiler&lt;BidiIter, RegexTraits, CompilerTraits&gt;::parse_sequence(FwdIter&amp;, FwdIter) [with FwdIter = const char*, BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, RegexTraits = boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, CompilerTraits = boost::xpressive::compiler_traits&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt;]' /usr/local/include/boost/xpressive/regex_compiler.hpp:281: instantiated from 'boost::xpressive::detail::sequence&lt;BidiIter&gt; boost::xpressive::regex_compiler&lt;BidiIter, RegexTraits, CompilerTraits&gt;::parse_alternates(FwdIter&amp;, FwdIter) [with FwdIter = const char*, BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, RegexTraits = boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, CompilerTraits = boost::xpressive::compiler_traits&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt;]' /usr/local/include/boost/xpressive/regex_compiler.hpp:212: instantiated from 'boost::xpressive::basic_regex&lt;BidiIter&gt; boost::xpressive::regex_compiler&lt;BidiIter, RegexTraits, CompilerTraits&gt;::compile_(FwdIter, FwdIter, boost::xpressive::regex_constants::syntax_option_type, std::forward_iterator_tag) [with FwdIter = const char*, BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, RegexTraits = boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, CompilerTraits = boost::xpressive::compiler_traits&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt;]' /usr/local/include/boost/xpressive/regex_compiler.hpp:120: instantiated from 'boost::xpressive::basic_regex&lt;BidiIter&gt; boost::xpressive::regex_compiler&lt;BidiIter, RegexTraits, CompilerTraits&gt;::compile(InputIter, InputIter, boost::xpressive::regex_constants::syntax_option_type) [with InputIter = const char*, BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, RegexTraits = boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, CompilerTraits = boost::xpressive::compiler_traits&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt;]' &lt;snipped&gt; /usr/local/include/boost/xpressive/detail/core/matcher/simple_repeat_matcher.hpp:90: instantiated from 'bool boost::xpressive::detail::simple_repeat_matcher&lt;Xpr, Greedy&gt;::match(boost::xpressive::detail::match_state&lt;BidiIter&gt;&amp;, const Next&amp;) const [with BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, Next = boost::xpressive::detail::matchable_ex&lt;__gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt; &gt;, Xpr = boost::xpressive::detail::matcher_wrapper&lt;boost::xpressive::detail::charset_matcher&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, mpl_::bool_&lt;true&gt;, boost::xpressive::detail::basic_chset&lt;char&gt; &gt; &gt;, Greedy = mpl_::bool_&lt;true&gt;]' /usr/local/include/boost/xpressive/detail/dynamic/dynamic.hpp:80: instantiated from 'bool boost::xpressive::detail::dynamic_xpression&lt;Matcher, BidiIter&gt;::match(boost::xpressive::detail::match_state&lt;BidiIter&gt;&amp;) const [with Matcher = boost::xpressive::detail::simple_repeat_matcher&lt;boost::xpressive::detail::matcher_wrapper&lt;boost::xpressive::detail::charset_matcher&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, mpl_::bool_&lt;true&gt;, boost::xpressive::detail::basic_chset&lt;char&gt; &gt; &gt;, mpl_::bool_&lt;true&gt; &gt;, BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;]' xpressive_simple.cc:18: instantiated from here /usr/local/include/boost/xpressive/detail/core/matcher/simple_repeat_matcher.hpp:97: warning: comparison between 'enum boost::xpressive::detail::quant_style&lt;quant_fixed_width, 1ul, true&gt;::&lt;anonymous&gt;' and 'enum mpl_::size_t&lt;1073741822ul&gt;::&lt;anonymous&gt;' /usr/local/include/boost/xpressive/detail/core/matcher/simple_repeat_matcher.hpp: In member function 'bool boost::xpressive::detail::simple_repeat_matcher&lt;Xpr, Greedy&gt;::match_(boost::xpressive::detail::match_state&lt;BidiIter&gt;&amp;, const Next&amp;, boost::xpressive::detail::greedy_slow_tag) const [with BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, Next = boost::xpressive::detail::matchable_ex&lt;__gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt; &gt;, Xpr = boost::xpressive::detail::matcher_wrapper&lt;boost::xpressive::detail::charset_matcher&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, mpl_::bool_&lt;false&gt;, boost::xpressive::detail::basic_chset&lt;char&gt; &gt; &gt;, Greedy = mpl_::bool_&lt;true&gt;]': /usr/local/include/boost/xpressive/detail/core/matcher/simple_repeat_matcher.hpp:90: instantiated from 'bool boost::xpressive::detail::simple_repeat_matcher&lt;Xpr, Greedy&gt;::match(boost::xpressive::detail::match_state&lt;BidiIter&gt;&amp;, const Next&amp;) const [with BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, Next = boost::xpressive::detail::matchable_ex&lt;__gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt; &gt;, Xpr = boost::xpressive::detail::matcher_wrapper&lt;boost::xpressive::detail::charset_matcher&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, mpl_::bool_&lt;false&gt;, boost::xpressive::detail::basic_chset&lt;char&gt; &gt; &gt;, Greedy = mpl_::bool_&lt;true&gt;]' /usr/local/include/boost/xpressive/detail/dynamic/dynamic.hpp:80: instantiated from 'bool boost::xpressive::detail::dynamic_xpression&lt;Matcher, BidiIter&gt;::match(boost::xpressive::detail::match_state&lt;BidiIter&gt;&amp;) const [with Matcher = boost::xpressive::detail::simple_repeat_matcher&lt;boost::xpressive::detail::matcher_wrapper&lt;boost::xpressive::detail::charset_matcher&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, mpl_::bool_&lt;false&gt;, boost::xpressive::detail::basic_chset&lt;char&gt; &gt; &gt;, mpl_::bool_&lt;true&gt; &gt;, BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;]' xpressive_simple.cc:18: instantiated from here /usr/local/include/boost/xpressive/detail/core/matcher/simple_repeat_matcher.hpp:97: warning: comparison between 'enum boost::xpressive::detail::quant_style&lt;quant_fixed_width, 1ul, true&gt;::&lt;anonymous&gt;' and 'enum mpl_::size_t&lt;1073741822ul&gt;::&lt;anonymous&gt;' /usr/local/include/boost/xpressive/detail/core/matcher/simple_repeat_matcher.hpp: In member function 'bool boost::xpressive::detail::simple_repeat_matcher&lt;Xpr, Greedy&gt;::match_(boost::xpressive::detail::match_state&lt;BidiIter&gt;&amp;, const Next&amp;, boost::xpressive::detail::greedy_slow_tag) const [with BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, Next = boost::xpressive::detail::matchable_ex&lt;__gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt; &gt;, Xpr = boost::xpressive::detail::matcher_wrapper&lt;boost::xpressive::detail::charset_matcher&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, mpl_::bool_&lt;true&gt;, boost::xpressive::detail::compound_charset&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt; &gt; &gt;, Greedy = mpl_::bool_&lt;true&gt;]': /usr/local/include/boost/xpressive/detail/core/matcher/simple_repeat_matcher.hpp:90: instantiated from 'bool boost::xpressive::detail::simple_repeat_matcher&lt;Xpr, Greedy&gt;::match(boost::xpressive::detail::match_state&lt;BidiIter&gt;&amp;, const Next&amp;) const [with BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, Next = boost::xpressive::detail::matchable_ex&lt;__gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt; &gt;, Xpr = boost::xpressive::detail::matcher_wrapper&lt;boost::xpressive::detail::charset_matcher&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, mpl_::bool_&lt;true&gt;, boost::xpressive::detail::compound_charset&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt; &gt; &gt;, Greedy = mpl_::bool_&lt;true&gt;]' /usr/local/include/boost/xpressive/detail/dynamic/dynamic.hpp:80: instantiated from 'bool boost::xpressive::detail::dynamic_xpression&lt;Matcher, BidiIter&gt;::match(boost::xpressive::detail::match_state&lt;BidiIter&gt;&amp;) const [with Matcher = boost::xpressive::detail::simple_repeat_matcher&lt;boost::xpressive::detail::matcher_wrapper&lt;boost::xpressive::detail::charset_matcher&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, mpl_::bool_&lt;true&gt;, boost::xpressive::detail::compound_charset&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt; &gt; &gt;, mpl_::bool_&lt;true&gt; &gt;, BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;]' xpressive_simple.cc:18: instantiated from here /usr/local/include/boost/xpressive/detail/core/matcher/simple_repeat_matcher.hpp:97: warning: comparison between 'enum boost::xpressive::detail::quant_style&lt;quant_fixed_width, 1ul, true&gt;::&lt;anonymous&gt;' and 'enum mpl_::size_t&lt;1073741822ul&gt;::&lt;anonymous&gt;' /usr/local/include/boost/xpressive/detail/core/matcher/simple_repeat_matcher.hpp: In member function 'bool boost::xpressive::detail::simple_repeat_matcher&lt;Xpr, Greedy&gt;::match_(boost::xpressive::detail::match_state&lt;BidiIter&gt;&amp;, const Next&amp;, boost::xpressive::detail::greedy_slow_tag) const [with BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, Next = boost::xpressive::detail::matchable_ex&lt;__gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt; &gt;, Xpr = boost::xpressive::detail::matcher_wrapper&lt;boost::xpressive::detail::charset_matcher&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, mpl_::bool_&lt;false&gt;, boost::xpressive::detail::compound_charset&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt; &gt; &gt;, Greedy = mpl_::bool_&lt;true&gt;]': /usr/local/include/boost/xpressive/detail/core/matcher/simple_repeat_matcher.hpp:90: instantiated from 'bool boost::xpressive::detail::simple_repeat_matcher&lt;Xpr, Greedy&gt;::match(boost::xpressive::detail::match_state&lt;BidiIter&gt;&amp;, const Next&amp;) const [with BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, Next = boost::xpressive::detail::matchable_ex&lt;__gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt; &gt;, Xpr = boost::xpressive::detail::matcher_wrapper&lt;boost::xpressive::detail::charset_matcher&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, mpl_::bool_&lt;false&gt;, boost::xpressive::detail::compound_charset&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt; &gt; &gt;, Greedy = mpl_::bool_&lt;true&gt;]' /usr/local/include/boost/xpressive/detail/dynamic/dynamic.hpp:80: instantiated from 'bool boost::xpressive::detail::dynamic_xpression&lt;Matcher, BidiIter&gt;::match(boost::xpressive::detail::match_state&lt;BidiIter&gt;&amp;) const [with Matcher = boost::xpressive::detail::simple_repeat_matcher&lt;boost::xpressive::detail::matcher_wrapper&lt;boost::xpressive::detail::charset_matcher&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt;, mpl_::bool_&lt;false&gt;, boost::xpressive::detail::compound_charset&lt;boost::xpressive::regex_traits&lt;char, boost::xpressive::cpp_regex_traits&lt;char&gt; &gt; &gt; &gt; &gt;, mpl_::bool_&lt;true&gt; &gt;, BidiIter = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;]' xpressive_simple.cc:18: instantiated from here /usr/local/include/boost/xpressive/detail/core/matcher/simple_repeat_matcher.hpp:97: warning: comparison between 'enum boost::xpressive::detail::quant_style&lt;quant_fixed_width, 1ul, true&gt;::&lt;anonymous&gt;' and 'enum mpl_::size_t&lt;1073741822ul&gt;::&lt;anonymous&gt;' </code></pre> <p>What am I doing in the program that's causing these warnings to show up?</p> <p>Edit: I'm using boost version 1.43 and g++ version 4.2.1.</p>
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      1. POC++ compiler gives pages of warnings when using boost::xpressive
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    1. COI am afraid that it seems more an Xpressive error that an error on your part. Which version of Boost are you using ?
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    2. COTry using Clang. It's errors are at least readable, and without the endless instantiated from lists of GCC...
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