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< serialize(std::ostream &os)
---
> serialize(CheckpointOut &cp) const M5_ATTR_OVERRIDE
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< Base::serialize(os);
---
> Base::serialize(cp);
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< unserialize(Checkpoint *cp, const std::string &section)
---
> unserialize(CheckpointIn &cp) M5_ATTR_OVERRIDE
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< Base::unserialize(cp, section);
---
> Base::unserialize(cp);