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![show/hide quicksearch [+]](../../images/find.png)
Resolver sets are used to look up specifications (and their dependencies) used in resolution. This set is abstract.
The find_all method must be implemented.  It returns all Resolver Specification objects matching the given DependencyRequest req.
 
               # File rubygems/resolver/set.rb, line 34
def find_all req
  raise NotImplementedError
end
             
            The prefetch method may be overridden, but this is not necessary.  This default implementation does nothing, which is suitable for sets where looking up a specification is cheap (such as installed gems).
When overridden, the prefetch method should look up specifications matching reqs.
 
               # File rubygems/resolver/set.rb, line 46
def prefetch reqs
end