Add implemented earliest time and called it from MerkelMain

CM2005 Object Oriented Programming/Topic 4/4.2.3/OrderBook.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "OrderBookEntry.h"
+#include "CSVReader.h"
+#include <string>
+#include <vector>
+
+class OrderBook
+{
+  public:
+    /* Construct, reading a csv data file */
+    OrderBook(std::string filename);
+    /* return vector of all known products in the dataset */
+    std::vector<std::string> getKnownProducts();
+    /* return vector of Orders according to the sent filters */
+    std::vector<OrderBookEntry> getOrders(OrderBookType type, std::string product, std::string timestamp);
+    std::string getEarliestTime();
+    static double getHighPrice(std::vector<OrderBookEntry>& orderList);
+    static double getLowPrice(std::vector<OrderBookEntry>& orderList);
+  private:
+    std::vector<OrderBookEntry> orders;
+};