wouldn't that be slower than just getting the bytes

You could use Spirit (Spirit2?) but would it be the most suitable? There are other, more low-entry options in boost:. StringAlgo (is useful but stops at strings, bit of regex). Regex can define regular expressions (e.g. your (a|b|c)* ) and then match/search/replace . Xpressive (REs and the ensuing semantic actions and user-defined assertions). Easy learning curve.It depends on what the problem is. edit: bojan has some remarks on Xpressive and its applicability to order book flow.

QuoteOriginally posted by: outrunQuoteOriginally posted by: CuchulainnYou could use Spirit (Spirit2?) but would it be the most suitable? There are other, more low-entry options in boost:. StringAlgo (is useful but stops at strings, bit of regex). Regex can define regular expressions (e.g. your (a|b|c)* ) and then match/search/replace . Xpressive (REs and the ensuing semantic actions and user-defined assertions). Easy learning curve.It depends on what the problem is. edit: bojan has some remarks on Xpressive and its applicability to order book flow.good edit!the messages look like this:10=3.14;11=hi;45=what?;80=1234;i.r.key=value;key=value;...the key is always an integer the value type dependent on the key (int, string, float)I'm now thinking on writing a simple state transition loop that extract key,value pairs and calls some function with thoseI knocked up a quick piece of code to do the k/v part of this stuff (the niceties of RTTI is student exercise, maybe boost any or Variant..)

QuoteI'll compare performance against a simple alternating '=' and ';' scanner, thanks!Btw: map.insert(make_pair(k,v)) is faster than map[k]=vChances are that Xpressive is faster than any other hand-crafted solution. After all, that's what these guys do.How much faster?

Here is a solution with spirit stolen from Hartmut.Can you take this in your comparison ?

Here's the third option using the StringAlgo

And here is the bare essentials (no print stuff): Corollary: StringAlgo is extremely useful.

Solution #4: If you want to have more control over the precise form of the regular expressions in your order book, you can use Regex. Here is some code (we can talk about V2 over a coffee )

dbl