convert char[4] to uint at compile time

Denis Koroskin 2korden at gmail.com
Tue Dec 23 02:16:28 PST 2008


On Tue, 23 Dec 2008 11:07:08 +0300, Janderson <ask at me.com> wrote:

> Moritz Warning wrote:
>> On Tue, 16 Dec 2008 19:54:11 +0000, BCS wrote:
>>
>>> Reply to Moritz,
>>>
>>>> Hi,
>>>>
>>>> I have problems to convert a char[4] to an uint at compile time. All
>>>> variations (I've tried) of using an enum crashes dmd:
>>>>
>>>> union pp { char[4] str; uint num; }
>>>> const uint x = pp("abcd").num
>>>> This does also doesn't work:
>>>>
>>>> const uint x = cast(uint) x"aa aa aa aa";
>>>>
>>>> Any ideas?
>>>>
>>>>
>>> template Go (char[4] arg)
>>> {
>>>     const uint Go = (arg[0] << 24) | (arg[1] << 16) | (arg[2] << 8) |
>>>     arg[3];
>>> }
>>>
>>> import std.stdio;
>>> void main()
>>> {
>>>    writef("%x\n", Go!("Good"));
>>> }
>>  Thanks!
>> That workaround should do it.
>>  Maybe it will be possible to just do cast(uint) "abcd" in the future.  
>> :>
>
> That would only cast the pointer.  It should be something like :  
> cast(uint)(*"abcs") or *cast(uint*) "abcs".
>
> -Joel

And what about endianness? You can't have a feature in a language that gives different results in different environment.


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