[boost] Re: FOREACH / C++ "for" proposal

From: Thorsten Ottosen (nesotto_at_[hidden])
Date: 2005-05-10 13:15:58

"Dave Harris" <brangdon_at_[hidden]> wrote in message 
news:memo.753692_at_cix.compulink.co.uk...
| In-Reply-To: <427F7635.4010303_at_[hidden]>
| sstrasser_at_[hidden] (Stefan Strasser) wrote (abridged):
| > you might be interested in this document from the new c++0x mailing:
| >
| > http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1796.html
| >
| > for the naming discussion, proposed syntax is for(int i : vec)
| > (personally I don't care if it's called BOOST_FOREACH or BOOST_FOR)
|
| I don't mind if it is BOOST_FOR_EACH or BOOST_FOR :-)
|
|
| > I've questioned in the past if it is expected behaviour to do
| > "hoisting". the proposal does.
|
| Although it doesn't seem to say whether "vec" is hoisted, and the given
| translation suggests that it isn't. I imagine that is an oversight in the
| presentation rather than the intended semantics. Interestingly he gives an
| example of an adaptor which could potentially be evaluated multiple times.

which example are you referring to?

| The proposal says:
|
|   The user is required to include the standard header <iterator>
|   in which the default version of begin()/end() is defined
|
| which seems wrong to me. #include<vector> ought to be enough to use for
| with std::vector, if it's a built-in facility.

chances are that <vector> will include <iterator> anyway.

-Thorsten