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richcompare_mutating_seqs

rustpython_vm::iter

Function richcompare_mutating_seqs 

Source 
pub fn richcompare_mutating_seqs(
    get_a: impl FnMut(usize) -> (usize, Option<PyObjectRef>),
    get_b: impl FnMut(usize) -> (usize, Option<PyObjectRef>),
    op: PyComparisonOp,
    vm: &VirtualMachine,
) -> PyResult<bool>
Expand description

Compare two sequences whose item-comparison callbacks may mutate the containers. get(i) must snapshot (len, item_at_i) and drop any container lock before returning.

After an unequal item, sizes are read again: if a callback shrank a sequence so i is now past the end, the result is a length comparison rather than the item inequality.