Function try_with_global_context 

pub fn try_with_global_context<C: 'static, R>(
    f: impl FnOnce(&mut C) -> Result<R>,
) -> Result<Option<R>>

Like with_global_context but returns Ok(None) when context is missing.

Examples

use ad_tensors_rs::try_with_global_context;

let value = try_with_global_context::<u64, _>(|ctx| Ok(*ctx)).unwrap();
assert_eq!(value, None);