Re: [Haskell-cafe] Haskell integration with C/C++ (GSOC)

Am 05.04.2012 um 08:42 schrieb Brandon Allbery:

On Thu, Apr 5, 2012 at 01:53, Sutherland, Julian wrote: data Tree = Node Left Right | Leaf

Could be converted to a struct in C/C++:

struct Tree { struct Tree* left; struct Tree* right; };

Shouldn't this actually be a tagged union? Not that they exist as such in C/C++, but are easy enough to emulate (minus the extra type checking that real tagged unions such as even Pascal gives you):

Not necessarily. The above type is equivalent to type Tree = Maybe (Left, Right) (modulo strictness, of course) and the C/C++ convention is to represent Nothing by a NULL pointer.