Re: [boost] [filesystem] Request for comments on proposed relative() function

2014-05-14 11:02 GMT+02:00 Rob Stewart :

On May 9, 2014 4:23:00 PM EDT, Daniel Pfeifer wrote:

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2014-05-08 21:02 GMT+02:00 Bjorn Reese :

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On 05/08/2014 07:19 PM, Beman Dawes wrote:

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Creates a path from the trailing elements of p that are relative to base.

It may be more user-friendly to add that base must be a prefix of p.

It might be even more user-friendly to allow this use case:

BOOST_TEST(fs::relative("/abc", "/abc/def") == path("../def"));

The first element in the range p, that's not in base, is the empty set, so p cannot be made relative to base in your example. If you reverse the arguments, then the result would be "def".

My bad. I inteded to write: BOOST_TEST(fs::relative("/abc", "/abc/def") == path("..")); BOOST_TEST(fs::relative("/abc/def", "/abc/ghi") == path("../def")); Here again, the first element in the range p, that's not in base, is the empty set. So you say that this is not possible? I see that the proposed implementation of fs::relative does not support it, but I am very interested in this functionality. -- Daniel