Marray | You can use map , filter , join and etc | Widget library

First, in main() you have:

If you define a structure like:

Right now you are logging the element itself, you need to check for the data inside. Depending on how the information is stored you could possibly get the information with something such as

As the error says, the algorithm makes use of the FlexibleContexts extension [haskell.org]. Normally only constraints of the form C t, or C (q t1 t2 … tn) can be used, with C a typeclass and q, t and ti type variables. By enabling the FlexibleContexts, the constraints can also make use of type constructors.

The compiler detects that the type constraints use (MArray (STArray s) e0 m, MArray (STArray s) v m) as context, so with STArray as a type constructor, which is not allowed. The compiler detects this and raises an error that mentions:

You receive data in BCD format

The function forPrimM maps a function (e -> m e) over a mutable array.

You have it right there. The function you map over the array must be type-preserving. That's because the updates happen in-place.

Theoretically I suppose it's possible to re-use the storage of an Int array to store Double values, but that's not something I'd attempt except as a last-resort optimisation. In your case I'd suspect it's a much better idea to modify func12 so it can generate Double values by itself, perhaps you can make it (Unbox n, Num n) parametric?

Providing an array where a pointer is expected (as is the case in main) results in a pointer to the first element of the array. So we just need func1(2, mArray); in main.

In func1, you want to pass the pointer you received to func2, so you want func2(pos, mArray);. You don't want &mArray any more than you want &pos. You simply want to pass the value of the parameter variable (the address of the first element of main's mArray), not the address of the parameter variable.

Fixed:

For me, this api gives an error, so enter it manually

Does the activity register any broadcast receiver? The leaktrace shows LoadedApk.mReceivers which is an ArrayMap of receivers to receiver dispatcher and the activity is the receiver dispatcher.