[boost] Re: [ANN] xpressive 0.9

From: Eric Niebler (eric_at_[hidden])
Date: 2004-09-06 00:23:12

Jonathan Turkanis wrote:
> "Eric Niebler" <eric_at_[hidden]> wrote:
>>2) s1 kind of looks like $1, which is the perl equivalent.
> 
> 
> I didn't think of 2). Did you put in in the docs?

No. Guess I should.

> FWIW, capital 'S' looks more
> like '$' to me. E.g.,
> 
>     '<' >> (S1= +_w) >> '>' >> -*_ >> "</" >> S1 >> '>'

This is true, but it runs contrary to Boost's naming conventions. ALL 
CAPS is for macros.

> 
>>That said, I'm open to suggestions for avoiding the name conflicts. I
>>would consider switching back to _1 _2 _3 if the technical problems were
>>overcome and if people liked it better.
> 
> 
> May I assume you have considered reusing the placeholders from boost::bind?
> There doesn't seem to be much operator overloading involving boost::arg<>.

I thought of that. Trouble is, xpressive's placeholders need to have an 
operator=, which must be a member. Besides, I rely on ADL to find 
xpressive's operators, and bind's placeholders are not in the correct 
namespace for my purposes.

-- 
Eric Niebler
Boost Consulting
www.boost-consulting.com