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POAre "anonymous structs" standard? And, really, what *are* they?
 

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  1. POAre "anonymous structs" standard? And, really, what *are* they?
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    <p>MSDN <a href="http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx" rel="noreferrer">reckons</a> that anonymous structs are non-standard in C++:</p> <blockquote> <p>A Microsoft C extension allows you to declare a structure variable within another structure without giving it a name. These nested structures are called anonymous structures. C++ does not allow anonymous structures.</p> <p>You can access the members of an anonymous structure as if they were members in the containing structure.</p> </blockquote> <p><a href="https://stackoverflow.com/questions/14187647/c-private-modifier-ignored-on-nested-anonymous-struct#comment19665939_14187647"><em>@K-ballo</em> agrees</a>.</p> <p>I'm told that this feature isn't necessarily the same as just creating an unnamed struct but I can't see a distinction in terms of standard wording.</p> <p>C++11 says:</p> <blockquote> <p><code>[C++11: 9/1]</code>: <em>[..]</em> A <em>class-specifier</em> whose <em>class-head</em> omits the <em>class-head-name</em> defines an unnamed class.</p> </blockquote> <p>and provides an entire grammatical construction for a type definition missing a name.</p> <p>C++03 lacks this explicit wording, but similarly indicates that the <code>identifier</code> in a type definition is optional, and makes reference to "unnamed classes" in <code>9.4.2/5</code> and <code>3.5/4</code>.</p> <ul> <li>So is MSDN wrong, and these things are all completely standard?</li> <li>Or is there some subtlety I'm missing between "unnamed structs/classes" and the same when used as members that prevents them from being covered by this C++03/C++11 functionality?</li> <li>Am I missing some fundamental difference between "unnamed struct" and "anonymous struct"? They look like synonyms to me.</li> </ul>
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    1. COYey I'm cited in your question! That's my knowledge with _C++03_, don't find anything that says it changed on _C++11_...
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    2. CO@K-ballo: BTW did you get a notification for that?
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    3. COSounds like two different things. In the case you refer to, there are structs which aren't instantiated with names, but rather like what's ok with unions. "anonymous structs" however, I interpret as structs with an anonymous type name. Such as: `struct { int x; } y;` which is fine. Am I missing something?
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