Stewart, Robert wrote:
Dave Jenkins wrote:
"Stewart, Robert" wrote:
I was experimenting with Xpressive to see how it would compare with some custom, string-based numeric input parsing. The Xpressive code is over 175X slower than the custom code.
Each call to parse() is constructing the sregex variables. If you make them static or move them out of the loop, it should help a lot.
Thanks, but see my reply to Eric's. While that would help with the benchmark performance, the nature of the function I'm testing means I can't do that otherwise.
Really what you're saying is: "I can't/don't want to use xpressive in the ways that are *documented* to make it perform well. Why is it slow?" You already have your answer. -- Eric Niebler BoostPro Computing http://www.boostpro.com