- bool set_before(const ValueNode::Handle &a);
- ValueNode::Handle get_before()const;
- bool set_after(const ValueNode::Handle &a);
- ValueNode::Handle get_after()const;
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- bool set_swap_time(const ValueNode::Handle &x);
- ValueNode::Handle get_swap_time()const;
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- bool set_swap_length(const ValueNode::Handle &x);
- ValueNode::Handle get_swap_length()const;
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