Subject: Re: [boost] hex/unhex()?
From: Olaf van der Spek (ml_at_[hidden])
Date: 2011-11-02 07:55:57
On Wed, Nov 2, 2011 at 12:54 PM, Hartmut Kaiser
>> On Wed, Nov 2, 2011 at 12:32 PM, Hartmut Kaiser <hartmut.kaiser_at_[hidden]>
>> > As Marshal pointed out, Spirit supports that easily:
>> > std::string input("61626f6465");
>> > std::string str;
>> > if (qi::parse(input.begin(), input.end(), qi::hex, str))
>> > assert(str == "abode");
>> Is there no range-based variant of parse()?
>> > and
>> > std::string str("abode");
>> > std::string output;
>> > if (karma::generate(back_inserter(output), karma::hex, str))
>> > assert(output == "61626f6465");
>> > If you want to avoid the cost of possible reallocations in output, just
>> call output.reserve(...) upfront. Otherwise both code snippets generate
>> code equivalent to hand written assembly and have been shown to be as fast
>> as it can get.
>> When would generate() fail (return false)?
>> AFAIK to hex can't fail and in that case a variant that returns
>> std::string would be nicer.
> Actually, please disregard what I wrote, it is complete nonsense. I misread
> your initial mail.
> Note to self: drink coffee before responding to email!
Why? Your functions seem quite close to the desired functionality.
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