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allocators for all work, every data type used in a Bu::Heap must support the
equals operator and <= or >=, or you need to write your own comparison functor.
The heap works as both a min-heap and max-heap, just change out the functor used
for camparison, kinda' cool.
The print function I'll leave in for a little while, but not in the long run, it
just prints a dot graph to stdout.
Next up, the Ito version.
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I'm thinking the heap should add one layer to the binary tree each time it
grows, which means double+1 each time. The Bu::ItoHeap will be implemented as
soon as the rest of Bu::Heap is done.
Also, I finally added bu/util.h which is mainly handy template functions like
Bu::swap, Bu::min, Bu::max, and Bu::mid. A few more may be added.
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