Added an explicit lifetime to the return type of exchange.get_rate to prevent lifetime conflicts between it and other functions. To demonstrate where these lifetime conflicts come up, here's the following code:
fn convert<'a, T: FormattableCurrency>(exchange: &Exchange<'a, T>, money: &Money<'a, T>, currency: &T) -> Result<Money<'a, T>, ErrorCode> {
let exchange_rate_pair = exchange.get_rate(money.currency(), currency);
if let Some(exchange_rate_pair) = exchange_rate_pair {
let cur_money = exchange_rate_pair.convert(money.clone())?;
Ok(cur_money)
} else{
Err(ErrorCode::CouldNotFindExchangeRate)
}
}
In this code, there's an error where it requests an explicit lifetime on exchange because the lifetime on the values within the result of get_rate don't match the lifetimes everywhere else ('a). This should resolve that problem.
varunsrin
commented
3 years ago
Added an explicit lifetime to the return type of
exchange.get_rateto prevent lifetime conflicts between it and other functions. To demonstrate where these lifetime conflicts come up, here's the following code:In this code, there's an error where it requests an explicit lifetime on exchange because the lifetime on the values within the result of
get_ratedon't match the lifetimes everywhere else ('a). This should resolve that problem.