c21e7739   
   From: doomster@knuut.de   
      
   Jeremy Todd wrote:   
   > I need to compute the absolute value of the minimum signed int value   
   > for each signed integral type. This value isn't representable as a   
   > signed int, but it is representable as an unsigned int.   
   >   
   > This is easy when a larger signed type is available:   
   >   
   > int32_t min_int32 = std::numeric_limits::min();   
   > int64_t abs_min_int32= -int64_t(min_int32);   
   > uint32_t answer = uint32_t(abs_min_int32);   
   >   
   > I couldn't come up with an elegant solution when attempting this for   
   > the 64-bit type.   
      
      
   You could use the fact that "min == min/2 + (min - min/2)" and that the   
   absolute of the two summands can be represented as the according *int_t.   
      
   Uli   
      
      
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