add tutorial in 'Qt_EQL/' for accessing C++ apps from Lisp

Qt_EQL/tutorial/test.h

@@ -0,0 +1,27 @@
+#ifndef APP_H
+#define APP_H
+
+#include <QObject>
+#include <ecl/ecl.h>
+
+class Test : public QObject {
+    Q_OBJECT
+public:
+    Test(QObject*, const QString&);
+
+    // define function acting as constructor (callable from Lisp)
+    // N.B. return a vanilla Qt class (here: QObject*) known to EQL5
+    Q_INVOKABLE QObject* newInstance(QObject*, const QString&);
+
+public Q_SLOTS:
+    // you may pass any type found in '~/eql5/src/ecl_fun.cpp::toMetaArg()'
+    QString concat(const QStringList&);
+
+    // pass Lisp data
+    void processData(cl_object);
+
+    // call back to Lisp
+    void printMe();
+};
+
+#endif