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Accept custom memory allocators (std::allocator) #1017
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This is related to #94
The idea is that we do very few memory allocations as it is, but we could, optionally, allow the user to provide use with a memory allocator instance from which we would ask the memory.
Possibly, this could only be supported for C++17 compilers because the change in std::allocator between C++17 and pre-C++17 is rather major. Supporting the old API in addition to the new one would be unpleasant work. Of course, the feature could be extended to C++11 later, especially if there are willing programmers.
This is a relatively easy feature to add. We don't do allocations all over the place. We may have 4 or 5 memory allocations in the whole library.
cc @KubaO @TkTech