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use malachite_base::num::conversion::traits::WrappingFrom;
use natural::InnerNatural::{Large, Small};
use natural::Natural;
impl Natural {
/// Returns the number of limbs of a [`Natural`].
///
/// Zero has 0 limbs.
///
/// # Worst-case complexity
/// Constant time and additional memory.
///
/// # Examples
/// ```
/// extern crate malachite_base;
///
/// use malachite_base::num::arithmetic::traits::Pow;
/// use malachite_base::num::basic::integers::PrimitiveInt;
/// use malachite_base::num::basic::traits::Zero;
/// use malachite_nz::natural::Natural;
/// use malachite_nz::platform::Limb;
///
/// if Limb::WIDTH == u32::WIDTH {
/// assert_eq!(Natural::ZERO.limb_count(), 0);
/// assert_eq!(Natural::from(123u32).limb_count(), 1);
/// assert_eq!(Natural::from(10u32).pow(12).limb_count(), 2);
/// }
/// ```
pub fn limb_count(&self) -> u64 {
match *self {
natural_zero!() => 0,
Natural(Small(_)) => 1,
Natural(Large(ref limbs)) => u64::wrapping_from(limbs.len()),
}
}
}