On Tue, Sep 29, 2009 at 11:00 AM, Neal Becker <ndbeck...@gmail.com> wrote:
> fixed_pt arrays need to apply the overflow_policy after operations > (overflow_policy could be clip, or throw exception). > > I thought __array_wrap__ would work for this, but it seems to not be called > when I need it. For example: > > In [13]: obj > Out[13]: fixed_pt_array([ 0, 32, 64, 96, 128]) > > In [14]: obj*100 < this should overflow > enter: [ 0 32 64 96 128] << on entry into __array_wrap > enter: [0 32 64 96 128] > exit: [ 0 32 64 96 128] > Out[14]: fixed_pt_array([ 0, 3200, 6400, 9600, 12800]) > > Apparantly, obj*100 is never passed to array_wrap. > > Is there another way I can do this? > > I believe array wrap has to be explicitly called after the fact. The problem is that you derived from ndarray, but fixed point isn't an ndarray because ndarray doesn't *have* fixed point. If you were to implement *using* ndarray you could catch everything in the operator calls. As a rule of thumb, inheritance is always the wrong thing to do ;) Chuck
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