Manage C-instance with GC

Questions & Answers
1

One might get a C structure A, and its constructor make_A() and destructor free_A(A*). In ffi, we can bind them by ffi/unsafe, but how to let GC handle A's instance and tell GC calls free_A when unused?

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2

See ffi/unsafe/alloc.

For an example use, see the libcairo bindings.

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