Petr

Petr has asked 259 questions and find answers to 410 problems.

Stats

About

Petr questions

Why doesn't Scala's implicit class work when one of the type parameters should be Nothing?
How to make a tail-recursive method that can also refer to itself in a non-tail-recursive way
What type is used by std::allocate_shared to allocate memory?
How to set up a different pager and color mode in Mercurial?
How to define foldM using foldr/foldl (if it is possible)?
How to implement the inverse of "intercalate" (splitting a string into pieces on a character) using functions from "base"?
Are there monadic/applicative map (i.e. traverse/mapM) functions over ByteString or Text?
How are Scala's local lazy variables implemented?
How to interrupt asynchronous computations in Scala?
How would one create a proper polymorphic Functor instance failing on unsafeVacuous?

Petr answers

How do you `get` the current state from a a state monad that is part of a product monad?
How can I duplicate a git-svn cloned repository, so that git svn dcommit still works
How to make a tail-recursive method that can also refer to itself in a non-tail-recursive way
Loading Network.HTTP module in Haskell on GHC7.4.1
Parsing "SQL like" query strings
ERROR! unexpected parameter type in action: <class 'ansible.parsing.yaml.objects.AnsibleSequence'>
How to wait on multiple `MVar`s?
Scala Dynamics: Ability to add dynamic methods?
Performance of two alternative functions that compute least divisor
How to set up a different pager and color mode in Mercurial?