recurrence 0.15.0

Recurrence rules (RRULE) as defined in the iCalendar RFC.
Documentation 
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use crate::RRuleError;

pub(crate) fn checked_mul_u32(v1: u32, v2: u32, hint: Option<&str>) -> Result<u32, RRuleError> {
    v1.checked_mul(v2).ok_or_else(|| match hint {
        Some(hint) => RRuleError::new_iter_err(format!(
            "Could not multiply number, would overflow (`{v1} * {v2}`), {hint}."
        )),
        None => RRuleError::new_iter_err(format!(
            "Could not multiply number, would overflow (`{v1} * {v2}`).",
        )),
    })
}

pub(crate) fn checked_add_u32(v1: u32, v2: u32, hint: Option<&str>) -> Result<u32, RRuleError> {
    v1.checked_add(v2).ok_or_else(|| match hint {
        Some(hint) => RRuleError::new_iter_err(format!(
            "Could not add numbers, would overflow (`{v1} + {v2}`), {hint}."
        )),
        None => RRuleError::new_iter_err(format!(
            "Could not add numbers, would overflow (`{v1} + {v2}`).",
        )),
    })
}