On 14/02/2018 2:02 PM, Adrian Matoga wrote:
On Wednesday, 14 February 2018 at 10:57:26 UTC, rikki cattermole wrote:
See lines:
- Input!IR temp = input;
- input = temp;

           bool commentLine() {
        Input!IR temp = input;

        if (!temp.empty) {
            input = temp;
            return true;
        } else
            return false;

`temp = input.save` is exactly what you want here, which means forward range is required. Your example won't work for range objects with reference semantics.

Ah I must be thinking of ranges that support indexing.

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