From: Eric Niebler (eric_at_[hidden])
Date: 2008-03-16 20:49:18
Robert Dailey wrote:
>> Eric Niebler wrote:
>> using xpressive::ref;
>> string output = regex_replace(input, rx, ref(replacements)[_]);
>> Here, "_" gets substituted with a sub_match representing the current
>> match. You can also use s1, s2, etc., to access the other sub-matches.
> How is "[_]" legal C++ syntax?
It's magic. Actually, it's a lambda expression. xpressive::ref() creates
a lazy reference, operator creates an object representing a lazy index
operation, etc.. Check out http://tinyurl.com/36qfn6 for other things
you can do with lambda expressions in xpressive 2.0 (which *will* be
part of 1.35).
-- Eric Niebler Boost Consulting www.boost-consulting.com
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