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    <p>I'm currently playing around with the Boost.Enum proposal from the <a href="https://github.com/boost-vault/Miscellaneous" rel="noreferrer">Boost Vault</a> (filename <code>enum_rev4.6.zip</code>). Although it was never officially submitted for inclusion into Boost, it's useable as-is. (Documentation is lacking but is made up for by clear source code and good tests.)</p> <p>Boost.Enum lets you declare an enum like this:</p> <pre><code>BOOST_ENUM_VALUES(Level, const char*, (Abort)("unrecoverable problem") (Error)("recoverable problem") (Alert)("unexpected behavior") (Info) ("expected behavior") (Trace)("normal flow of execution") (Debug)("detailed object state listings") ) </code></pre> <p>And have it automatically expand to this:</p> <pre><code>class Level : public boost::detail::enum_base&lt;Level, string&gt; { public: enum domain { Abort, Error, Alert, Info, Trace, Debug, }; BOOST_STATIC_CONSTANT(index_type, size = 6); Level() {} Level(domain index) : boost::detail::enum_base&lt;Level, string&gt;(index) {} typedef boost::optional&lt;Level&gt; optional; static optional get_by_name(const char* str) { if(strcmp(str, "Abort") == 0) return optional(Abort); if(strcmp(str, "Error") == 0) return optional(Error); if(strcmp(str, "Alert") == 0) return optional(Alert); if(strcmp(str, "Info") == 0) return optional(Info); if(strcmp(str, "Trace") == 0) return optional(Trace); if(strcmp(str, "Debug") == 0) return optional(Debug); return optional(); } private: friend class boost::detail::enum_base&lt;Level, string&gt;; static const char* names(domain index) { switch(index) { case Abort: return "Abort"; case Error: return "Error"; case Alert: return "Alert"; case Info: return "Info"; case Trace: return "Trace"; case Debug: return "Debug"; default: return NULL; } } typedef boost::optional&lt;value_type&gt; optional_value; static optional_value values(domain index) { switch(index) { case Abort: return optional_value("unrecoverable problem"); case Error: return optional_value("recoverable problem"); case Alert: return optional_value("unexpected behavior"); case Info: return optional_value("expected behavior"); case Trace: return optional_value("normal flow of execution"); case Debug: return optional_value("detailed object state listings"); default: return optional_value(); } } }; </code></pre> <p>It satisfies all five of the priorities which you list.</p>
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    1. POWhich Typesafe Enum in C++ Are You Using?
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    1. USJosh Kelley
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    1. COwhy is this needed to solve a problem that dosn't exist??!! *head explodes*
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    2. CONo need for exploding heads; the complexity is nicely hidden behind macros and a clean interface. And standard C enums have several real problems: lack of type safety, no ability to query an enum type for its max size, lack of automatic conversion to/from strings.
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    3. COThis is what I was looking for, thanks! :)
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      1. USJoão Matos
 

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