Add browser history class

src/BrowsingHistory.cpp

+#include "BrowsingHistory.h"
+
+BrowsingHistory::BrowsingHistory() :
+    history(),
+    currentPosition(0) {}
+
+void BrowsingHistory::addEntry(URL url) {
+    if (!history.empty()) {
+        ++currentPosition;
+    }
+    if (currentPosition < history.size()) {
+        history.erase(history.begin() + currentPosition, history.end());
+    }
+    history.push_back(url);
+}
+
+URL const& BrowsingHistory::goForward() {
+    if (currentPosition < history.size()) {
+        ++currentPosition;
+    }
+    return history[currentPosition];
+}
+
+URL const& BrowsingHistory::goBack() {
+    if (currentPosition > 0) {
+        --currentPosition;
+    }
+    return history[currentPosition];
+}
+
+std::vector<URL> const& BrowsingHistory::getHistory() const {
+    return history;
+}

src/BrowsingHistory.h

+#ifndef BROWSINGHISTORY_H
+#define BROWSINGHISTORY_H
+
+#include <vector>
+#include "URL.h"
+
+class BrowsingHistory {
+public:
+    BrowsingHistory();
+    void addEntry(URL url);
+    URL const& goForward();
+    URL const& goBack();
+    std::vector<URL> const& getHistory() const;
+    
+private:
+    std::vector<URL> history;
+    unsigned int currentPosition;
+};
+
+#endif