[Go] Updated the 'callback' and 'extend' examples to match the 'director' one.

After the documentation update on how to utilize the director feature with
commit @17b1c1c the 'callback' and 'extend' examples needed an update as well.

Examples/go/extend/Makefile

@@ -1,6 +1,7 @@
 TOP        = ../..
 SWIG       = $(TOP)/../preinst-swig
 CXXSRCS    = extend.cxx
+GOSRCS     = ceo.go
 TARGET     = example
 INTERFACE  = example.i
 SWIGOPT    =
@@ -9,8 +10,15 @@ check: build
 	$(MAKE) -f $(TOP)/Makefile SRCDIR='$(SRCDIR)' CXXSRCS='$(CXXSRCS)' TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' go_run
 
 build:
-	$(MAKE) -f $(TOP)/Makefile SRCDIR='$(SRCDIR)' CXXSRCS='$(CXXSRCS)' SWIG='$(SWIG)' \
-	SWIGOPT='$(SWIGOPT)' TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' go_cpp
+	if [ -n '$(SRCDIR)' ]; then \
+		cp $(GOSRCS:%=$(SRCDIR)/%) .; \
+	fi
+	@# Note: example.go gets generated by SWIG
+	$(MAKE) -f $(TOP)/Makefile SRCDIR='$(SRCDIR)' CXXSRCS='$(CXXSRCS)' GOSRCS='example.go $(GOSRCS)' \
+	SWIG='$(SWIG)' SWIGOPT='$(SWIGOPT)' TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' go_cpp
 
 clean:
+	if [ -n '$(SRCDIR)' ]; then \
+		rm $(GOSRCS) || true; \
+	fi
 	$(MAKE) -f $(TOP)/Makefile SRCDIR='$(SRCDIR)' INTERFACE='$(INTERFACE)' go_clean

Examples/go/extend/ceo.go

@@ -0,0 +1,37 @@
+package example
+
+type CEO interface {
+	Manager
+	deleteManager()
+	IsCEO()
+}
+
+type ceo struct {
+	Manager
+}
+
+func (p *ceo) deleteManager() {
+	DeleteDirectorManager(p.Manager)
+}
+
+func (p *ceo) IsCEO() {}
+
+type overwrittenMethodsOnManager struct {
+	p Manager
+}
+
+func NewCEO(name string) CEO {
+	om := &overwrittenMethodsOnManager{}
+	p := NewDirectorManager(om, name)
+	om.p = p
+
+	return &ceo{Manager: p}
+}
+
+func DeleteCEO(p CEO) {
+	p.deleteManager()
+}
+
+func (p *ceo) GetPosition() string {
+	return "CEO"
+}

Examples/go/extend/example.h

@@ -44,7 +44,7 @@ public:
 	const Employee *get_item(int i) {
 		return list[i];
 	}
-	~EmployeeList() { 
+	~EmployeeList() {
 		std::vector<Employee*>::iterator i;
 		std::cout << "~EmployeeList, deleting " << list.size() << " employees." << std::endl;
 		for (i=list.begin(); i!=list.end(); i++) {

Examples/go/extend/index.html

@@ -12,13 +12,16 @@
 <H2>Extending a simple C++ class in Go</H2>
 
 <p>
-This example illustrates the extending of a C++ class with cross
-language polymorphism.
-
+This example illustrates how to inherit from a C++ class in Go.
+See the <a href="../../../Doc/Manual/Go.html#Go_director_classes">Go Director
+Classes</a> documentation subsection for an in-depth explanation how to use the
+director feature.
 <p>
+
 <ul>
-<li><a href="example.h">example.h</a>.  Header file containing some enums.
-<li><a href="example.i">example.i</a>.  Interface file.
+<li><a href="ceo.go">ceo.go</a>.  Go source with the definition of the CEO class.
+<li><a href="example.h">example.h</a>. Header with the definition of the Employee, Manager and EmployeeList classes.
+<li><a href="example.i">example.i</a>.  SWIG interface file.
 <li><a href="runme.go">runme.go</a>. Sample Go program.
 </ul>
 

Examples/go/extend/runme.go

@@ -7,19 +7,12 @@ import (
 	"fmt"
 )
 
-type CEO struct{}
-
-func (p *CEO) GetPosition() string {
-	return "CEO"
-}
-
 func main() {
 	// Create an instance of CEO, a class derived from the Go
 	// proxy of the underlying C++ class.  The calls to getName()
 	// and getPosition() are standard, the call to getTitle() uses
 	// the director wrappers to call CEO.getPosition().
-
-	e := NewDirectorManager(new(CEO), "Alice")
+	e := NewCEO("Alice")
 	fmt.Println(e.GetName(), " is a ", e.GetPosition())
 	fmt.Println("Just call her \"", e.GetTitle(), "\"")
 	fmt.Println("----------------------")
@@ -27,7 +20,6 @@ func main() {
 	// Create a new EmployeeList instance.  This class does not
 	// have a C++ director wrapper, but can be used freely with
 	// other classes that do.
-
 	list := NewEmployeeList()
 
 	// EmployeeList owns its items, so we must surrender ownership
@@ -49,15 +41,13 @@ func main() {
 	// CEO, but now Go thinks the object is an instance of class
 	// Employee.  So the call passes through the Employee proxy
 	// class and on to the C wrappers and C++ director, eventually
-	// ending up back at the Java CEO implementation of
+	// ending up back at the Go CEO implementation of
 	// getPosition().  The call to GetTitle() for item 3 runs the
 	// C++ Employee::getTitle() method, which in turn calls
 	// GetPosition().  This virtual method call passes down
-	// through the C++ director class to the Java implementation
+	// through the C++ director class to the Go implementation
 	// in CEO.  All this routing takes place transparently.
-
 	fmt.Println("(position, title) for items 0-3:")
-
 	fmt.Println("  ", list.Get_item(0).GetPosition(), ", \"", list.Get_item(0).GetTitle(), "\"")
 	fmt.Println("  ", list.Get_item(1).GetPosition(), ", \"", list.Get_item(1).GetTitle(), "\"")
 	fmt.Println("  ", list.Get_item(2).GetPosition(), ", \"", list.Get_item(2).GetTitle(), "\"")
@@ -66,11 +56,11 @@ func main() {
 
 	// Time to delete the EmployeeList, which will delete all the
 	// Employee* items it contains. The last item is our CEO,
-	// which gets destroyed as well.
+	// which gets destroyed as well and hence there is no need to
+	// call DeleteCEO.
 	DeleteEmployeeList(list)
 	fmt.Println("----------------------")
 
 	// All done.
-
 	fmt.Println("Go exit")
 }