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use_ref_optional_usize_with

react_sys

Function use_ref_optional_usize_with 

Source 
pub fn use_ref_optional_usize_with(
    get_initial_value: &mut (impl FnMut() -> Option<usize> + MaybeUnwindSafe),
) -> MutableRefObjectOptionalUsize
Expand description

Closure get_initial_value will be called immediately, thus it is safe to use reference here.

Closure get_initial_value will be called only once or never called