pub type ExchangeCacheKey = (u64, i32);
(stock_id, lv2_prob) — exchange-level cache key.
(stock_id, lv2_prob)
对齐 C++ ExchangeCacheKey(nStockID, nLv2Prob) (QotRealTimeData.cpp).
ExchangeCacheKey(nStockID, nLv2Prob)