Function influxdb_line_protocol::to_string

pub fn to_string<'a, T, F>(
    measurement: &str, 
    tag_set: T, 
    field_set: F, 
    timestamp: Option<i64>
) -> Result<String, Error> where
    T: IntoIterator<Item = (&'a str, &'a str)>,
    F: IntoIterator<Item = (&'a str, FieldValue<'a>)>,