pub trait OptionCheckedAdd<Rhs = Self, InnerRhs = Rhs> {
    type Output;

    fn opt_checked_add(self, rhs: Rhs) -> Result<Option<Self::Output>, Error>;
Expand description

Trait for values and Options checked addition.

Implementing this trait leads to the following auto-implementations:

  • OptionCheckedAdd<Option<InnerRhs>> for T.
  • OptionCheckedAdd<Rhs> for Option<T>.
  • OptionCheckedAdd<Option<InnerRhs>> for Option<T>.
  • … and some variants with references.

Note that since the std library doesn’t define any CheckedAdd trait, users must provide the base implementation for the inner type.

Required Associated Types§

The resulting inner type after applying the addition.

Required Methods§

Computes the checked addition.

  • Returns Ok(Some(result)) if result could be computed.
  • Returns Ok(None) if at least one argument is None.
  • Returns Err(Error::Overflow) if an overflow occured.

Implementations on Foreign Types§