Re: Treating a slice as an InputRange

[Ali Çehreli via Digitalmars-d-learn]

On 11/15/2017 01:02 PM, Jonathan M Davis wrote:
> On Wednesday, November 15, 2017 20:53:39 unleashy via Digitalmars-d-learn
>> ubyte[] slice;
>> ...
>> int a = readInt(slice);
>> double b = readDouble(slice);
>>
>> Ends up failing, because readInt properly reads an int, but the
>> slice is not mutated "outside" of itself

That should work:

import std.range;

T read(T, Range)(auto ref Range range) if (isInputRange!Range) {
    range.popFront();
    return 42;
}

unittest {
    ubyte[] slice = [ 1, 2 ];
    read!int(slice);
    assert(slice == [2]);
}

void main() {
}

> If you specifically want a function to
> accept a range and mutate it without returning it, then it should 
take its
> argument by ref.

Agreed.

Ali