[Issue 9061] BigInt | BigInt, BigInt & int

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=9061



--- Comment #5 from bearophile_hugs at eml.cc 2013-11-07 08:30:43 PST ---
(In reply to comment #4)

> While working on this today, I noticed an unpleasant detail. What should be the
> result of this:
> 
> import std.bigint: BigInt;
> 
> void main() {
>     BigInt a = "0xB16_B16_B16_B16_B16_B16_B16_B16_B16";
>     BigInt b = 4;
>     BigInt c = a & ~b; // Unset bit 3
>     assert(c == BigInt("0xB16_B16_B16_B16_B16_B16_B16_B16_B12");
> }
> 
> And if the comment is correct, then this is wrong:
> 
> import std.bigint : BigInt;
> 
> void main() {
>     BigInt a = "0xB16_B16_B16_B16_B16_B16_B16_B16_B16";
>     BigInt b = 4;
>     BigInt c = a & b; // Separate bit 3
>     assert(c == 4);
> }
> 
> I would argue that the latter behavior is better, and a separate function may
> be required for the former.
> 
> Also, how should ~b work, if at all?

This is what Python 2.6.5 answers to your questions:

>>> a = 0xB16B16B16B16B16B16B16B16B16
>>> b = 4
>>> c = a & ~b
>>> c == 0xB16B16B16B16B16B16B16B16B12
True


>>> a = 0xB16B16B16B16B16B16B16B16B16
>>> b = 4
>>> c = a & b
>>> c
4L
>>> ~b
-5

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