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< serialize(std::ostream &os)
---
> serialize(CheckpointOut &cp) const
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< unserialize(Checkpoint *cp, const std::string §ion)
---
> unserialize(CheckpointIn &cp)
< serialize(std::ostream &os)
---
> serialize(CheckpointOut &cp) const
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< unserialize(Checkpoint *cp, const std::string §ion)
---
> unserialize(CheckpointIn &cp)