[Boost-users] [Filesystem] questions

Subject: [Boost-users] [Filesystem] questions
From: John Dlugosz (JDlugosz_at_[hidden])
Date: 2010-06-14 12:25:22

I'm trying to replace my use of native file-path manipulations with the Filesystem TR2 candidate library, in preparation to advocating the use of this library as proper style instead of home-grown wrappers everywhere.  However, I still have questions on some of the things I ran into in this simple usage:

1)  I call remove (p,ec); and get a compile-time error that no form takes two arguments.  Looking in the header, that seems to be the case.  The Filesystem Reference (<http://www.boost.org/doc/libs/1_43_0/libs/filesystem/doc/reference.html>) clearly shows an error code parameter.

I understand this module is tracking the standardization process.  So which is newer?  Should I be anticipating the code change to match the docs, or vice versa?

How do I find out if there was an error and report the details?  Note that I want to consider the case of the file not existing in the first place as OK.

2)  The documentation shows things like:
template <class Path> bool remove(const Path& p, system::error_code & ec = singular );
    *  if ec != singular, then ec.clear().

I can't find any definition for 'singular'.  What is it?  Besides acting as a flag to know if the argument was defaulted, it seems like it's doing some kind of one-shot behavior?

3) The basic_path constructor that takes two InputIterators: what kind of iterator is that?  It doesn't seem to want characters, but an iterator of parts like produced by the begin/end functions.  But the iterator's underlying type is not defined, so you can't make your own collection of "parts".  So why doesn't the constructor just take its own iterator type, but is a template?  What else could you give it?

The documentation is not clear.



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