Add C++ sample

samples/C++/gdsdbreader.h

@@ -0,0 +1,69 @@
+#ifndef GDSDBREADER_H
+#define GDSDBREADER_H
+
+// This file contains core structures, classes and types for the entire gds app
+// WARNING: DO NOT MODIFY UNTIL IT'S STRICTLY NECESSARY
+
+#include <QDir>
+#include "diagramwidget/qgldiagramwidget.h"
+
+#define GDS_DIR "gdsdata"
+
+enum level {LEVEL_ONE, LEVEL_TWO, LEVEL_THREE};
+
+// The internal structure of the db to store information about each node (each level)
+// this will be serialized before being written to file
+class dbDataStructure
+{
+public:
+    QString label;
+    quint32 depth;
+    quint32 userIndex;
+    QByteArray data;    // This is COMPRESSED data, optimize ram and disk space, is decompressed
+                        // just when needed (to display the comments)
+
+    // The following ID is used to create second-third level files
+    quint64 uniqueID;
+    // All the next items linked to this one
+    QVector<dbDataStructure*> nextItems;
+    // Corresponding indices vector (used to store data)
+    QVector<quint32> nextItemsIndices;
+    // The father element (or NULL if it's root)
+    dbDataStructure* father;
+    // Corresponding indices vector (used to store data)
+    quint32 fatherIndex;
+    bool noFatherRoot; // Used to tell if this node is the root (so hasn't a father)
+
+    // These fields will be useful for levels 2 and 3
+    QString fileName; // Relative filename for the associated code file
+    QByteArray firstLineData; // Compressed first line data, this will be used with the line number to retrieve info
+    QVector<quint32> linesNumbers; // First and next lines (next are relative to the first) numbers
+
+    // -- Generic system data not to be stored on disk
+    void *glPointer; // GL pointer
+
+    // These operator overrides prevent the glPointer and other non-disk-necessary data serialization
+    friend QDataStream& operator<<(QDataStream& stream, const dbDataStructure& myclass)
+    // Notice: this function has to be "friend" because it cannot be a member function, member functions
+    // have an additional parameter "this" which isn't in the argument list of an operator overload. A friend
+    // function has full access to private data of the class without having the "this" argument
+    {
+        // Don't write glPointer and every pointer-dependent structure
+        return stream << myclass.label << myclass.depth << myclass.userIndex << qCompress(myclass.data)
+                         << myclass.uniqueID << myclass.nextItemsIndices << myclass.fatherIndex << myclass.noFatherRoot
+                            << myclass.fileName << qCompress(myclass.firstLineData) << myclass.linesNumbers;
+    }
+    friend QDataStream& operator>>(QDataStream& stream, dbDataStructure& myclass)
+    {
+        //Don't read it, either
+        stream >> myclass.label >> myclass.depth >> myclass.userIndex >> myclass.data
+                      >> myclass.uniqueID >> myclass.nextItemsIndices >> myclass.fatherIndex >> myclass.noFatherRoot
+                         >> myclass.fileName >> myclass.firstLineData >> myclass.linesNumbers;
+        myclass.data = qUncompress(myclass.data);
+        myclass.firstLineData = qUncompress(myclass.firstLineData);
+        return stream;
+    }
+
+};
+
+#endif // GDSDBREADER_H