ubytes to ulong problem

[ponce]

On Saturday, 21 December 2013 at 22:29:59 UTC, ponce wrote:
> On Saturday, 21 December 2013 at 22:22:09 UTC, Charles Hixson 
> wrote:
>> I was planning to ask if there were a better way to do this, 
>> but instead I need to ask what's my mistake?
>> For some reason, if called with an uninitialized ubyte array, 
>> and an index of 0, it returns a value of 8, even though all 
>> the values in the array are 0.
>> The error has to be somewhere in the "ret = " statement, but I 
>> sure don't see it.
>>
>> /**    Convert 8 consecutive bytes sliced from a ubyte[] into 
>> a ulong
>> * @param    block    The array from which to slice.
>> * @param    n    The starting index within the block    */
>> ulong    ubytesToUlong(ubyte[] block, int n)
>> {    ulong    ret;
>>    assert (n >= 0);
>>    assert (n + 8 <= block.length);
>>    writefln ("n = %s", n);
>>    writefln ("block[0] = %s", cast(ulong)block[0]);
>>    writefln ("block[1] = %s", cast(ulong)block[1]);
>>    writefln ("block[2] = %s", cast(ulong)block[2]);
>>    writefln ("block[3] = %s", cast(ulong)block[3]);
>>    writefln ("block[4] = %s", cast(ulong)block[4]);
>>    writefln ("block[5] = %s", cast(ulong)block[5]);
>>    writefln ("block[6] = %s", cast(ulong)block[6]);
>>    writefln ("block[7] = %s", cast(ulong)block[7]);
>>    ret    =    cast(ulong)block[n] * 2^21
>>            +    cast(ulong)block[n+1] * 2^18
>>            +    cast(ulong)block[n+2] * 2^15
>>            +    cast(ulong)block[n+3] * 2^12
>>            +    cast(ulong)block[n+4] * 2^9
>>            +    cast(ulong)block[n+5] * 2^6
>>            +    cast(ulong)block[n+6] * 2^3
>>            +    cast(ulong)block[n+7] * 2^0;
>>    writefln ("ret = %s", ret);
>>    return    ret;
>> }

Use the exponentiation operator which is spelled: ^^