financial 1.1.5

A collection of finance calculations mimicking some of Excel Financial Functions interface
Documentation 
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use chrono::{DateTime, TimeZone};

pub struct CheckedCashflowSchedule<'a, T>
where
    T: TimeZone,
{
    pub values: &'a [f64],
    pub dates: &'a [DateTime<T>],
}

impl<'a, T> CheckedCashflowSchedule<'a, T>
where
    T: TimeZone,
{
    pub fn new(
        values: &'a [f64],
        dates: &'a [DateTime<T>],
    ) -> Result<CheckedCashflowSchedule<'a, T>, &'static str>
    where
        T: TimeZone,
    {
        if values.len() != dates.len() {
            return Err("Values and dates length must match");
        }

        let d0 = dates.first().unwrap();
        if dates.iter().any(|d| *d < *d0) {
            return Err("First date must be the earliest");
        };

        Ok(CheckedCashflowSchedule { values, dates })
    }
}