From: marc.glisse@googlemail.com   
      
   fmatthew5876  wrote:   
      
   > typedef _Foo<   
   > sizeof(void*) < sizeof(uint64_t)   
   > ? SlowBar   
   > : FastBar> Foo;   
      
   ?: is for expressions. For types, use std::conditional (or boost::if_c).   
      
      
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