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    <p>You can use Hartmut Kaiser's <code>attribute_of_qi_component</code> metafunction from <a href="http://article.gmane.org/gmane.comp.parsers.spirit.general/18387" rel="nofollow">here</a>. This internally uses what ildjarn suggested for individual parsers, and in addition to that, also works with expressions such as <code>qi::int_ &gt;&gt; qi::lexeme[ qi::as_string[+qi::char_] ]</code> below.</p> <pre><code>#define BOOST_TEST_MODULE attr_of_qi_parsers #include &lt;boost/test/included/unit_test.hpp&gt; #include &lt;boost/spirit/include/qi.hpp&gt; #include &lt;string&gt; #include &lt;utility&gt; #include &lt;boost/fusion/include/adapted.hpp&gt; namespace qi = boost::spirit::qi; typedef std::pair&lt;int,int&gt; pair_type; typedef boost::fusion::vector2&lt;int,std::string&gt; vector_int_string; struct data { data(){} data(int m1, int m2): member1(m1), member2(m2) {} int member1; int member2; }; std::ostream&amp; operator&lt;&lt;(std::ostream&amp; os, const data&amp; d) { os &lt;&lt; "{ 1st: " &lt;&lt; d.member1 &lt;&lt; ", 2nd: " &lt;&lt; d.member2 &lt;&lt; " }"; return os; } bool operator==(const data&amp; lhs, const data&amp; rhs) { return lhs.member1 == rhs.member1 &amp;&amp; lhs.member2 == rhs.member2; } BOOST_FUSION_ADAPT_STRUCT(data, (int, member1) (int, member2) ) //BOOST_CHECK_EQUAL requires that the arguments have defined operator&lt;&lt; //You can either use in the global namespace BOOST_TEST_DONT_PRINT_LOG_VALUE(pair_type); //or define operator&lt;&lt; in the namespace std. This is technically illegal but it works //namespace std //{ // std::ostream&amp; operator&lt;&lt;(std::ostream&amp; os, const std::pair&lt;int,int&gt;&amp; p) // { // os &lt;&lt; "&lt;" &lt;&lt; p.first &lt;&lt; "," &lt;&lt; p.second &lt;&lt; "&gt;"; // return os; // } //} namespace tests { template &lt;typename Expr, typename Iterator = boost::spirit::unused_type&gt; struct attribute_of_qi_component { typedef typename boost::spirit::result_of::compile&lt; qi::domain, Expr &gt;::type parser_expression_type; typedef typename boost::spirit::traits::attribute_of&lt; parser_expression_type, boost::spirit::unused_type, Iterator &gt;::type type; }; template &lt;typename P&gt; typename attribute_of_qi_component&lt;P&gt;::type parse(P const&amp; p, const std::string&amp; input) { std::string::const_iterator f = input.begin(); std::string::const_iterator l = input.end(); typename attribute_of_qi_component&lt;P&gt;::type parsed; qi::phrase_parse(f, l, p, boost::spirit::ascii::space, parsed); return parsed; } BOOST_AUTO_TEST_CASE(int_parser) { BOOST_CHECK_EQUAL(parse(qi::int_, "23" ), 23); } BOOST_AUTO_TEST_CASE(int_and_string_parser) { BOOST_CHECK_EQUAL(parse(qi::int_ &gt;&gt; qi::lexeme[ qi::as_string[+qi::char_] ], "23 is a number"), vector_int_string(23,"is a number")); } BOOST_AUTO_TEST_CASE(pair_rule_parser){ qi::rule&lt;std::string::const_iterator,pair_type(),boost::spirit::ascii::space_type&gt; pair_rule = qi::int_ &gt;&gt; ',' &gt;&gt; qi::int_; BOOST_CHECK_EQUAL(parse(pair_rule,"1, 2"), std::make_pair(1,2)); } BOOST_AUTO_TEST_CASE(data_rule_parser){ qi::rule&lt;std::string::const_iterator,data(),boost::spirit::ascii::space_type&gt; data_rule = qi::int_ &gt;&gt; ',' &gt;&gt; qi::int_; BOOST_CHECK_EQUAL(parse(data_rule,"2, 4"), data(2,4)); } }//end of tests namespace </code></pre>
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