Re: Question about function template(from Thinking in C++ book)

"Ben Voigt [C++ MVP]" <rbv@newsgroups.nospam>
Mon, 20 Jul 2009 11:05:17 -0500
"Igor Tandetnik" <> wrote in message

Pavel A. wrote:

Igor Tandetnik wrote:

Obviously, Iter is intended to be analogous to a double pointer - a
pointer into a collection of pointers to objects (perhaps smart
pointers). Something along the lines of:


But iterator can have a typecast operator to a single pointer,
so that double indirection won't be needed?

Yes, one could write drawAll to assume a single level of indirection, then
use something like

I wouldn't do this though, because you lose generality and mislead future
programmers reading the source. With the posted code, Iter can be any kind
of iterator or even a raw pointer. Using a single level of indirection with
raw pointers would be a disaster, polymorphism and pointer arithmetic don't

In order to use an indirect_iterator the code should be detemplatized or at
least the template parameter should be the target type not the iterator

With best wishes,
   Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925

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