Method check_class

crates/vm/src/protocol/object.rs:415–427

Equivalent to CPython's check_class. Returns Ok(()) if cls is a valid class, Err with TypeError if not. Uses abstract_get_bases internally.

(&self, vm: &VirtualMachine, msg: F)

    // Equivalent to CPython's check_class. Returns Ok(()) if cls is a valid class,
    // Err with TypeError if not. Uses abstract_get_bases internally.
    fn check_class<F>(&self, vm: &VirtualMachine, msg: F) -> PyResult<()>
    where
        F: Fn() -> String,
    {
        let cls = self;
        match cls.abstract_get_bases(vm)? {
            Some(_bases) => Ok(()), // Has __bases__, it's a valid class
            None => {
                // No __bases__ or __bases__ is not a tuple
                Err(vm.new_type_error(msg()))
            }
        }
    }

    /// abstract_get_bases() has logically 4 return states:
    /// 1. getattr(cls, '__bases__') could raise an AttributeError