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use crate::structs::cash::Cash;
pub trait Calculate {
fn add (&self, amount: f64) -> Self;
fn subtract (&self, amount: f64) -> Self;
fn multiply (&self, amount: f64) -> Self;
fn divide (&self, amount: f64) -> Self;
}
impl Calculate for Cash {
fn add (&self, amount: f64) -> Self {
let new_amount: f64 = &self.amount + amount;
Self {
currency: String::from(&self.currency),
amount: new_amount,
allow_negatives: self.allow_negatives,
}
}
fn subtract (&self, amount: f64) -> Self {
let new_amount: f64 = &self.amount - amount;
Self {
currency: String::from(&self.currency),
amount: if new_amount <= 0.0 { 0.0 } else { new_amount },
allow_negatives: self.allow_negatives,
}
}
fn multiply (&self, amount: f64) -> Self {
let new_amount: f64 = &self.amount * amount;
Self {
currency: String::from(&self.currency),
amount: new_amount,
allow_negatives: self.allow_negatives,
}
}
fn divide (&self, amount: f64) -> Self {
let new_amount: f64 = &self.amount / amount;
Self {
currency: String::from(&self.currency),
amount: if new_amount <= 0.0 { 0.0 } else { new_amount },
allow_negatives: self.allow_negatives,
}
}
}
