For: Data QueryResult = NoResult | DatabaseError String | Results [String] A close approximation I can think of is: enum {NoResult, DatabaseError, Results}; struct QueryResult { int type; union { char* error_msg; struct { char** msgs; int len; } results; }; }; https://gist.github.com/1116058 is a simple use case of the code I suggested. I am not sure there is only 1 solution to this though. On Sat, Jul 30, 2011 at 1:45 PM, Christopher Howard < christopher.howard@frigidcode.com> wrote:
One of the things that I love about Haskell is the syntax for creating user defined types. E.g.:
Data QueryResult = NoResult | DatabaseError String | Results [String]
I can prototype an entire program around these self-made types and it is a lot of fun. Out of intellect curiosity, though: what would be the equivalent construction in C or C++? (Say, for the type defined above).
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