Allocate a new revision walker to iterate through a repo.
This revision walker uses a custom memory pool and an internal
commit cache, so it is relatively expensive to allocate.
For maximum performance, this revision walker should be
reused for different walks.
This revision walker is *not* thread safe: it may only be
used to walk a repository on a single thread; however,
it is possible to have several revision walkers in
several different threads walking the same repository.
@param out_ pointer to the new revision walker
@param repo the repo to walk through
@return 0 or an error code
Allocate a new revision walker to iterate through a repo.
This revision walker uses a custom memory pool and an internal commit cache, so it is relatively expensive to allocate.
For maximum performance, this revision walker should be reused for different walks.
This revision walker is *not* thread safe: it may only be used to walk a repository on a single thread; however, it is possible to have several revision walkers in several different threads walking the same repository.
@param out_ pointer to the new revision walker @param repo the repo to walk through @return 0 or an error code