useserde::Serialize;/// Order validity specifying how long the order remains active.
#[derive(Debug, Serialize, Clone, Copy, PartialEq, Eq, Hash)]#[serde(rename_all ="UPPERCASE")]pubenumValidity{/// Immediate or Cancel
////// The order is executed immediately. Any remaining unfilled quantity
/// is cancelled.
Ioc,/// Valid for the entire trading day
Day,}