Dynamic arrays allocation size

Steven Schveighoffer schveiguy at yahoo.com
Tue Mar 26 11:35:30 PDT 2013


>> (And Issue 4835 is about compile-time constants. CFFE is already plenty  
>> slow, mostly because of memory allocations. Detecting overflow in  
>> constants is not going to significantly slow down compilation, and it  
>> has no effect on the runtime. Even GCC 4.3.4 performs such compile-time  
>> tests.)
>
> If CTFE did something different than real code, that would be a  
> problem.  Again, you should be able to construct the needed types with a  
> struct, to use in both CTFE and real code.

Let me clarify that constants that are combined by default (even without  
optimizations enabled), like the OP's example of 1024 * 1024 * 1024,  
should be able to emit an error at compile time on overflow, or  
automatically upgrade the type, I agree with that.

-Steve


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