From: daniel.kruegler@googlemail.com   
      
   On 2012-09-24 06:25, fmatthew5876 wrote:   
   > I want to implement an optimization at compile time based on whether   
   > the size of a pointer is large enough to store an object. Without   
   > trying to explain it, I'll just show some code.   
      
   [..]   
      
   > typedef _Foo<   
   > sizeof(void*) < sizeof(uint64_t)   
   > ? SlowBar   
   > : FastBar> Foo;   
   >   
   > The compiler complains about the ternary operator in the typedef.   
      
   The complain makes sense. There is no conditional operator for types   
   (What would be the common type?). In this case the most simple solution   
   is to use the std::conditional type trait:   
      
   typedef _Foo<   
   std::conditional::type> Foo;   
      
   HTH & Greetings from Bremen,   
      
   Daniel Krügler   
      
      
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