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data1_value_mut

miniextendr_api::externalptr::altrep_helpers

Function data1_value_mut 

Source 
unsafe fn data1_value_mut<T: TypedExternal>(
    erased: ErasedExternalPtr,
) -> Option<&'static mut T>
Expand description

The T that erased holds, with no RefCell borrow.

§Safety

As for altrep_data1_mut. The 'static lifetime is sound for the callback: R’s GC protects the ALTREP object, and so its data1, while the callback runs.