[Haskell-cafe] Interfacing C++ iterators does not work as expected

Huynh Huu Long long.upcase at googlemail.com
Mon May 2 21:35:51 CEST 2011


I tried to access C++ iterators from Haskell via the FFI. There are two
example programs attached, in Haskell as well as in C++. Both utilise the
same iterator wrapper example.cpp, but when running the Haskell program it
prints an empty list, where it should print the contents of some vector. The
C++ program meanwhile runs fine though. What does not seem to work is this

finished (std::vector<int>::iterator *begin, std::vector<int>::iterator
    return *begin == *end;

In Haskellland, "finished :: Ptr Iterator -> Ptr Iterator -> IO Bool" always
returns IO True. Is this a bug lurking in my program or is it a GHC issue?

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