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Function std.experimental.allocator.building_blocks.free_tree.FreeTree.allocate

Allocates n bytes of memory. First consults the free tree, and returns from it if a suitably sized block is found. Otherwise, the parent allocator is tried. If allocation from the parent succeeds, the allocated block is returned. Otherwise, the free tree tries an alternate strategy: If ParentAllocator defines deallocate, FreeTree releases all of its contents and tries again.

void[] allocate (
  size_t n


Splitting and coalescing should be implemented if ParentAllocator does not defined deallocate.