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add zig arena use cases
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zig-arena-allocator.md
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zig-arena-allocator.md
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self.arena_allocator.deinit();
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}
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```
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## Use cases
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- A short-lived scratch space storing intermediate results in a function,
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which is reset before/just after the function returns.
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- Long-lived “subsystem” arena which is used to allocate return values for
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the caller.
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- A permanent arena which is never freed.