<div dir="ltr">Since enums in C are just named integers, they are all of the same type. So it would be the same as doing three functions with int as the argument.<br><br><br></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Fri, Aug 2, 2013 at 12:29 PM, Lizunov, Andrey E <span dir="ltr"><<a href="mailto:andrey.e.lizunov@intel.com" target="_blank">andrey.e.lizunov@intel.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span lang="EN-US">Hello,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">I was trying to use __attribute__((overloadable)) for functions accepting enumerated types but hadn’t succeeded so far.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Clang 3.1 and 3.2 failed to compile the following example.<u></u><u></u></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">/* clang -x c foo.cpp */<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">typedef enum __One {DUMMY_1} One;<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">typedef enum {DUMMY_2} Two;<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">enum Three {DUMMY_3};<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">__attribute__((overloadable)) void foo(One);<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">__attribute__((overloadable)) void foo(Two);<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">__attribute__((overloadable)) void foo(enum Three);<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">int main()<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">{<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US"> foo(DUMMY_1);<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US"> return 0;<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">}
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Providing me with the following error message:</span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">$ clang -x c foo.cpp<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">foo.cpp:22:3: error: call to 'foo' is ambiguous<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US"> foo(DUMMY_1);<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US"> ^~~<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">foo.cpp:16:36: note: candidate function<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">__attribute__((overloadable)) void foo(One);<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US"> ^<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">foo.cpp:17:36: note: candidate function<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">__attribute__((overloadable)) void foo(Two);<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US"> ^<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">foo.cpp:18:36: note: candidate function<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">__attribute__((overloadable)) void foo(enum Three);<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US"> ^<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span style="font-family:"Courier New"" lang="EN-US">1 error generated.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">While with “-x c++” both versions of Clang compiled it successfully (failed to link though).</span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">According to </span><a href="http://clang.llvm.org/docs/LanguageExtensions.html#function-overloading-in-c" target="_blank"><span lang="EN-US">http://clang.llvm.org/docs/LanguageExtensions.html#function-overloading-in-c</span></a><span lang="EN-US">
overloadable attribute is an analogue for C++ function overloading in C.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">So, is it a bug in the Clang or I didn’t understand/consider something?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Brush Script MT";color:#7030a0" lang="EN-US">BR,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Brush Script MT";color:#7030a0" lang="EN-US">Andrey Lizunov<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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