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    <p>I just learned today that there was one (somewhat) significant change between N1570 and the final C11 standard (ISO/IEC 9899:2011 (E)).</p> <p>In N1570, 6.3.2p3 says:</p> <blockquote> <p>Except when it is the operand of the <code>sizeof</code> operator, the <code>_Alignof</code> operator, or the unary <code>&amp;</code> operator, or is a string literal used to initialize an array, an expression that has type "array of <em>type</em>" is converted to an expression with type "pointer to <em>type</em>" that points to the initial element of the array object and is not an lvalue.</p> </blockquote> <p>The inclusion of <code>_Alignof</code> was an error, since the syntax of a <em>unary-expression</em> permits</p> <pre><code>_Alignof ( type-name ) </code></pre> <p>but not</p> <pre><code>_Alignof unary-expression </code></pre> <p>The released C11 standard corrects this error and reverts to the C99 wording:</p> <blockquote> <p>Except when it is the operand of the <code>sizeof</code> operator, or the unary <code>&amp;</code> operator, or is a string literal used to initialize an array, an expression that has type "array of <em>type</em>" is converted to an expression with type "pointer to <em>type</em>" that points to the initial element of the array object and is not an lvalue.</p> </blockquote> <p>More information: in a recent posting to comp.std.c about differences between N1570 and the released standard, Larry Jones, a member of the ISO C committee, wrote:</p> <blockquote> <p>There are a number of them, but most are just minor editorial tweaks, changes to boilerplate text, and shuffling things around to keep the powers that be happy. The biggest change was removing _Alignof from a bunch of places it shouldn't have been added (based on the erroneous notion that it takes either a type or an expression like sizeof does when it really only takes a type): 6.3.2.1p2, p3, p4, fn. 65; and 6.7.1 fn. 121.</p> </blockquote> <p>Message-ID: <code>&lt;rfg33a-u0q.ln1@jones.homeip.net&gt;</code></p> <p>Here's <a href="https://groups.google.com/forum/?fromgroups=#!topic/comp.std.c/v5hsWOu5vSw">the thread</a> as seen on groups.google.com.</p>
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