In 1.006, this seems to be allowed in a CTFE function:

int q = A[i..j].length;
c += q;

But not this:

c += A[i..j].length;

Kevin

Kevin Bealer wrote:
> In 1.006, this seems to be allowed in a CTFE function:
> 
> int q = A[i..j].length;
> c += q;
> 
> But not this:
> 
> c += A[i..j].length;

Both should work. Can you provide a complete example?

Walter Bright wrote:
> Kevin Bealer wrote:
>> In 1.006, this seems to be allowed in a CTFE function:
>>
>> int q = A[i..j].length;
>> c += q;
>>
>> But not this:
>>
>> c += A[i..j].length;
> 
> Both should work. Can you provide a complete example?

Sure; in the 'bar' function below, the 'v += A.length' fails, but the previous two lines work just fine as a replacement.  The failure is reported like this:

dmd -ofexa example.d
example.d(26): Error: cannot evaluate (bar)("a b c d") at compile time

Kevin


// -*- c++ -*-

import std.stdio;
import std.string;
import std.file;

// For DMD 1.006

int bar(char[] A)
{
    int v;

    for(int i = 0; i < A.length; i++) {
        if (A[i] != ' ') {
//          int q = A.length; // these work
//          v += q;
            v += A.length; // but this fails
        }
    }

    return v;
}

int main(char[][] args)
{
    const int foo = bar("a b c d");

    return 0;
}