Method try_value_with

crates/vm/src/convert/try_from.rs:49–62

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

    }

    pub fn try_value_with<T, F, R>(&self, f: F, vm: &VirtualMachine) -> PyResult<R>
    where
        T: PyPayload,
        F: Fn(&T) -> PyResult<R>,
    {
        let class = T::class(&vm.ctx);
        let py_ref = if self.fast_isinstance(class) {
            self.downcast_ref()
                .ok_or_else(|| vm.new_downcast_runtime_error(class, self))?
        } else {
            return Err(vm.new_downcast_type_error(class, self));
        };
        f(py_ref)
    }
}

/// Lower-cost variation of `TryFromObject`