8 This is a [link parser parser].
12 It accepts one character in the range `a-z`, `A-Z` or `0-9`. The
13 result of the parser is the accepted character.
17 #include <boost/metaparse/alphanum.hpp>
19 [h1 Expression semantics]
21 The following are equivalent:
29 #include <boost/metaparse/alphanum.hpp>
30 #include <boost/metaparse/start.hpp>
31 #include <boost/metaparse/string.hpp>
32 #include <boost/metaparse/is_error.hpp>
33 #include <boost/metaparse/get_result.hpp>
35 using namespace boost::metaparse;
38 !is_error<alphanum::apply<BOOST_METAPARSE_STRING("0"), start>>::type::value,
39 "alphanum should accept a digit"
43 !is_error<alphanum::apply<BOOST_METAPARSE_STRING("x"), start>>::type::value,
44 "alphanum should accept a character"
49 alphanum::apply<BOOST_METAPARSE_STRING("x"), start>
50 >::type::value == 'x',
51 "the result of parsing should be the character value"
55 is_error<alphanum::apply<BOOST_METAPARSE_STRING(","), start>>::type::value,
56 "alphanum should reject a comma"