EvalStateWeak

nix_bindings_expr::eval_state

Struct EvalStateWeak 

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pub struct EvalStateWeak { /* private fields */ }
Expand description

A Weak reference to an EvalState.

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impl EvalStateWeak

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pub fn upgrade(&self) -> Option<EvalState>

Upgrade the weak reference to a proper EvalState.

If no normal reference to the EvalState is around anymore elsewhere, this fails by returning None.

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