Re: Qi parse retval vs iterators

On Tue, Dec 5, 2017 at 3:09 AM, Seth <[email protected]> wrote:
> On 04-12-17 23:09, Michael Powell wrote:
>> I should think that if there were any remaining input that would be a
>> failure to match?
>
> You shouldn't. PEG grammars are left-to-right greedy. This is documented.

That's a qualified greedily if I understand the background, where
series are concerned, optional, one|zero-or-more.

That said, I get it. Thank you.

> I've said this before:
>
> On 30-11-17 00:40, Seth wrote:
>> Bonus tip: consider adding `>> qi::eoi` at the end of the parse
>> expression so you don't need to check whether all of the input has been
>> consumed (it must).
>
> And also this warning about partially matching:
>
> On 27-11-17 13:51, Seth wrote:
>>
>> A more complete example:
>>
>> https://stackoverflow.com/questions/47243884/boost-spirit-qi-validating-input-parser/47244585#47244585
>>
>> Which makes the point that you might want to `lexeme [
>> uint_parser<uint16_t, 10, 2, 5>() >> !(digit|'.') ]` to avoid
>> partially matching longer numbers.
>>
>

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