core/com.nokia.carbide.cpp.compiler.doc.user/html/c_compiler/c_macro_args.htm
author stechong
Wed, 20 Oct 2010 11:19:31 -0500
changeset 2165 2a7b5eccb0bc
parent 1641 2b3996fc09a1
permissions -rw-r--r--
Keeping PlatSim internal only.

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<title>A # Not Followed by a Macro Argument</title>
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<h3>A # Not Followed by a Macro Argument</h3>
<p>(ISO C, &sect;6.10.3) The C compiler can accept <span class="code">#</span> tokens that do not appear before arguments in macro definitions.</p>
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  <h5>Listing 1. Preprocessor Macros Using # Without an Argument</h5>
  <p>#define add1(x) #x #1 // OK, but probably not what you wanted:<br />
    // add1(abc) creates &quot;abc&quot;#1<br />
    #define add2(x) #x &quot;2&quot; // OK: add2(abc) creates &quot;abc2&quot;</p>
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<p>See also &ldquo;Checking for Standard C and Standard C++ Conformity&rdquo;.<br />
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