[Boost-users] Program Options of Filesystem Path's - confused!

Subject: [Boost-users] Program Options of Filesystem Path's - confused!
From: John Dlugosz (JDlugosz_at_[hidden])
Date: 2010-08-13 13:11:58

OK, If I take a po:wvalue<std::wstring>()->notifier(&datadir_set)
the string gets passed to datadir_set, and within that function it implicitly converts the string to a fs::wpath instance to call set_me.  It works as expected.

        void set_me (const fs::wpath& p);

        void datadir_set (const std::wstring& s)
         {
         wcout << L"** set data dir to " << s << L".\n";
         set_me (s);
         }


However, if I declare the program option as
        po::wvalue<fs::wpath>()->notifier(&set_me)

then when it runs I get "invalid option value".  It apparently can't convert the argv token into a wpath?  But it's not a compile-time error so it thinks it knows how to, but gets an error actually doing it?

I have no trouble passing long string literals to the constructor, e.g. 
        fs::wpath f1 (L"C:\\here\\there.txt");

The program option takes "." on the command line just fine, so it's the specific value of the string it doesn't like!  I tried with Unix-style slashes, with no difference.

A little experimenting tells me that it doesn't like having spaces in the string!  Note that the quotes are understood by the run-time library that calls main, so the whole string (without surrounding quotes) is present in one element of argv.  It works just fine when taking the argument as a string.

This seems like a bug, somewhere.

--John






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