From: daniel.kruegler@googlemail.com   
      
   Am 17.09.2012 06:26, schrieb Gido:   
   > Is the following valid C++:   
   >   
   > int main() {   
   >       decltype(main()) i;   
   > }   
   >   
   > Is this guaranteed to resolve to "int i"?   
      
   I don't think so.   
      
   > I believe in general you can state decltype(function()) and it will   
   > yield the return type of the function. I am unsure because of   
   > main(); special rules might apply.   
   >   
   > 3.6.1.3 states "The function main shall not be used within a   
   > program".  But since the appearance in a decltype operand is not   
   > "usage", I would guess the code in the example above is correct.   
      
   Note that C++11 invented the term "odr-usage" as a significant   
   difference to "usage". The term "use" has no longer any special   
   meaning in the C++ Standard, so I would consider that by writing   
      
   decltype(main())   
      
   you are indeed "using" function main in the normal meaning of the   
   English language.   
      
   > GCC (4.7.0) with -pedantic however complains: "ISO C++ forbids   
   > taking address of function ‘::main’". This has me doubting the code.   
      
   While the diagnostics is very misleading, the error seems appropriate   
   to me.   
      
   HTH & Greetings from Bremen,   
      
   Daniel Krügler   
      
      
      
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