On Mon, 12 May 2014 20:12:41 +
Kai via Digitalmars-d-learn digitalmars-d-learn@puremagic.com wrote:
Hi I am trying to iterate over a mmfile (ubyte[]) and convert it
to uint
void main(){
MmFile inn = new MmFile(mmData.dat);
ubyte[] arr = cast(ubyte[])inn[];
for(ulong index = 0; indexarr.length; index+=4){
ulong stop = index+4;
uint num =
littleEndianToNative!uint(arr[index..stop]); }
if i try to compile this i get the following error:
Error: template std.bitmanip.littleEndianToNative cannot deduce
function from argument types !(uint)(ubyte[])
but if change the last line to:
uint num = littleEndianToNative!uint(arr[30..34]);
then it compiles and runs...
Am I doing something wrong with my variables index and stop?
cheers
The problem is that the compiler isn't smart enough to realize that
arr[index .. stop] is guaranteed to result in a array with a length of 4.
auto num = littleEndianToNative!uint(cast(ubyte[4])arr[index..stop]);
would work. On a side note, if you wanted to be safer, you should probably use
uint.sizeof everyewhere instead of 4. that would also make it easier to
convert it to a different integral type. Also, you should be using size_t, not
ulong for the indices. Array indices are size_t, and while that's ulong on a
64-bit system, it's uint on a 32-bit system, so your code won't compile on a
32-bit system.
- Jonathan M Davis
