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Add SharedAllocatorList #6465

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Add SharedAllocatorList #6465

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13 changes: 13 additions & 0 deletions changelog/shared-allocator-list.dd
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Added the `SharedAllocatorList`, as the thread-safe version of the regular `AllocatorList`.

The new $(REF SharedAllocatorList, std,experimental,allocator,building_blocks,allocator_list) has the same semantics as the regular `AllocatorList`.
Just as the regular `AllocatorList`, if the `BookkeepingAllocator` is `NullAllocator`, the `SharedAllocatorList` will switch to `ouroboros` mode,
allocationg memory for its own metadata.

---
SharedAllocatorList!((n) => SharedAscendingPageAllocator(max(n, numPages * pageSize)), NullAllocator) a;
auto b = a.allocate(100);
assert(b.length == 100);

assert(a.deallocate(b));
---
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