From: daniel.kruegler@googlemail.com   
      
   On 2013-06-27 02:46, marcel.loose@googlemail.com wrote:   
   > I was quite unhappy to find out that code I've written years ago   
   > suddenly fails to compile with the latest GCC (4.8). It compiles   
   > without warning (with -Wall and -Wextra) with GCC 4.7.3 as well as   
   > with Clang 3.2.   
   >   
   > Below is a completely stripped down version of the code. Is this   
   > illegal C++ code, or is this a bug in GCC 4.8?   
      
   The code looks invalid to me, see below why.   
      
   >    
   > template  class ObjectFactory;   
   >   
   > template   
   > class ObjectFactory { };   
   >   
   > struct Abstract { virtual ~Abstract() = 0; };   
   >   
   > struct Concrete : Abstract { };   
   >   
   > typedef ObjectFactory< Abstract(), int> MyFactory;   
   >    
   >   
   > When compiling with GCC 4.8 I get the following error:   
   >   
   > Eabstract-class-type.cc:10:33: error: ‘type name’ declared as   
   > function returning an abstract class type   
   >   typedef ObjectFactory< Abstract(), int> MyFactory;   
      
   The error looks appropriate to me. According to 10.4 [class.abstract],   
   p3:   
      
   "An abstract class shall not be used as a parameter type, as a   
   function return type, [..]"   
      
   This is clearly violated here.   
      
   HTH & Greetings from Bremen,   
      
   Daniel Krügler   
      
      
      
      
      
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