How dub select versions?

[Mike Parker via Digitalmars-d-learn]

On Wednesday, 5 October 2016 at 08:01:33 UTC, Daniel Kozak wrote:
> I really does not understand how does DUB works. I have small 
> app which use vibe-d:core as dependency, and I use libasync as 
> subConfiguration. When I try to build my app it always try to 
> download libasync-0.7.9 instead of libasync-0.8.0. Why? I would 
> expect to select the latest one frum dub repository

If you look into the vide.d dub.sdl, you'll see the following 
listed in the "libasync" configuration [1]:

dependency "libasync" version="~>0.7.8"

The ~> constrains the dependency to the minor version number, 
meaning DUB will not try to use a version of the dependency that 
has a higher minor version. In this case, it means >=0.7.8 && 
<0.8.0. See [2] for details.



[1] 
https://github.com/rejectedsoftware/vibe.d/blob/master/dub.sdl#L76
[2] https://github.com/dlang/dub/wiki/Version-management