llvm dev - Aug 2018 - Custom allocator for DenseMap

Hi all,

I'm curious, is there a reason why DenseMap doesn't templatize a custom
Allocator? I'm
in the process of switching all my uses of std::unordered_map and a
custom-rolled hash
map implementation to StringMap and DenseMap. StringMap allows the
injection of an
allocator, but not DenseMap.

Aside from subclassing DenseMapBase and implementing grow/shrink
functionality similar
to DenseMap, is there a simpler solution to injecting custom allocation and
deallocation
into a DenseMap?

Thanks,
Prashanth
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