2013/11/20 Bjorn Reese
On 11/19/2013 04:26 PM, Norbert Wenzel wrote:
I'm not sure if I understand your point correctly, but lexical_cast was
the one thing I used, which actually did work with string_ref. Though I didn't check if lexical_cast made any copies or other unnecessary stuff internally, but I think I got the correct results from lexical_cast.
You are right. lexical_cast does work with string_ref.
I overlooked the fact that lexical_cast works with both pointer+size and iterator_range ranges.
More specifically, I overlooked the fact that lexical_cast uses string_ref::operator<< to obtain the data (and I guess that this is why Boost.Spirit generally outperforms lexical_cast.)
There is a plan to add optimizations for string_ref to lexical_cast so there'll be minimal difference in performance. Boost.Spirit and Boost.LexicalCast differ not only in performance: lexical_cast is more precise when working with real numbers and uses std::locale during conversions to be able to process decimal and other separators in a locale dependent way. LexicalCast is also usable with user-defined types that have operator>> and operator<< overloads. So choose tool depending on your needs. -- Best regards, Antony Polukhin