[Boost-users] Placeholder Arguments

From: Joe McCay (joemccay_at_[hidden])
Date: 2005-04-17 17:13:42

     How do the placeholders actually get the arguments applied?  I
have read through parts of the metaprogramming book and the
documentation.  It's obvious to me how something like _1 (arg<1>)
selects its argument.  I haven't been able to figure out is how it
gets the arguments in the first place considering the Lambda
expression is not something like _1(5) in most of the examples I have
found.  My template skills are weak, and I am attempting to sharpen my
them (and
metaprogramming skills).

 Thank you in advance.
Sincerely,
Joseph L. McCay