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POHow do I make a recursive boost::variant which works with gcc 4.6?
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  1. POHow do I make a recursive boost::variant which works with gcc 4.6?
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    copied!<p>I am decoding bencode, and have some code which works well with gcc 4.4. But having recently upgraded to gcc 4.6 this code no longer builds:</p> <pre><code>#ifndef BENCODE_VALUETYPES_H #define BENCODE_VALUETYPES_H #include &lt;boost/variant.hpp&gt; #include &lt;string&gt; #include &lt;vector&gt; #include &lt;map&gt; namespace bencode { typedef boost::make_recursive_variant&lt; int, std::string, std::vector&lt;boost::recursive_variant_&gt;, std::map&lt;std::string, boost::recursive_variant_&gt; &gt;::type Value; typedef std::map&lt;std::string, Value&gt; ValueDictionary; typedef std::vector&lt;Value&gt; ValueVector; }; #endif </code></pre> <p>g++ gives this error message:</p> <pre><code>/usr/include/c++/4.6/bits/stl_pair.h: In instantiation of 'std::pair&lt;const std::basic_string&lt;char&gt;, boost::recursive_variant_&gt;': Decoder.cpp:97:39: instantiated from here /usr/include/c++/4.6/bits/stl_pair.h:93:11: error: 'std::pair&lt;_T1, _T2&gt;::second' has incomplete type /usr/include/boost/variant/variant_fwd.hpp:232:12: error: forward declaration of 'struct boost::recursive_variant_' </code></pre> <p>The <a href="http://www.boost.org/doc/libs/1_48_0/doc/html/variant/tutorial.html#variant.tutorial.recursive" rel="nofollow">documentation</a> for the latest boost version (1.48 at the moment) states that "due to standard conformance issues in several compilers, make_recursive_variant is not universally supported", and that you should use the recursive_wrapper instead. But I am having problem making the change: does anyone know what this should look like using the wrapper?</p>
 

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