Re: [boost] Filesystem Library: Formal Review

From: Beman Dawes (bdawes_at_[hidden])
Date: 2002-09-18 09:51:57

At 04:07 AM 9/18/2002, Vladimir Prus wrote:

 >Speaking terms of posix paths, I want
 >
 >     join("/home/ghost", "a/b") = "/home/ghost/a/b"
 >     join("/home/ghost", "/a/b") = "/a/b"

Sounds like you want the [make_]absolute() function we have been discussing 
in another thread. The order of the arguments is reversed, but other than 
that the functionality seems the same.

 >     int main()
 >     {
 >         fs::path p1("/home/ghost", fs::system_specific),
 >                  p2("/a/b/c", fs::system_specific),
                    p3("a/b/c");
           cout << absolute(p2, p1).file_path() << "\n";
           cout << absolute(p3, p1).file_path() << "\n";
 >         cout << (p1 << p2).file_path() << "\n";
 >     }

The output should be:

    /a/b/c
    /home/ghost/a/b/c
    /home/ghost/a/b/c

Note that last one demonstrates a deliberate feature rather than a bug. To 
make that clearer, the following has been added to the append docs:

   Rationale: It is not considered an error for rhs to include a
   system-specific-root because it might relative, and thus valid.
   For example, on Windows, the follow must succeed:

     path p( "c:", system_specific );
     p <<= path( "/foo", system_specific );
     assert( p.generic_path() == "c:/foo" );

--Beman