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Diffstat (limited to 'Examples/d/extend/d1/runme.d')
-rw-r--r-- | Examples/d/extend/d1/runme.d | 75 |
1 files changed, 0 insertions, 75 deletions
diff --git a/Examples/d/extend/d1/runme.d b/Examples/d/extend/d1/runme.d deleted file mode 100644 index 058432096..000000000 --- a/Examples/d/extend/d1/runme.d +++ /dev/null @@ -1,75 +0,0 @@ -/// This file illustrates the cross language polymorphism using directors. -module runme; - -import example; -import tango.io.Stdout; - -// CEO class, which overrides Employee.getPosition(). -class CEO : Manager { -public: - this( char[] name ) { - super( name ); - } - - override char[] getPosition() { - return "CEO"; - } - - // Public method to stop the SWIG proxy base class from thinking it owns the underlying C++ memory. - void disownMemory() { - swigCMemOwn = false; - } -} - -void main() { - // Create an instance of CEO, a class derived from the D 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(). - - auto e = new CEO( "Alice" ); - Stdout.formatln( "{} is a {}.", e.getName(), e.getPosition() ); - Stdout.formatln( "Just call her '{}'.", e.getTitle() ); - Stdout( "----------------------" ).newline; - - { - // Create a new EmployeeList instance. This class does not have a C++ - // director wrapper, but can be used freely with other classes that do. - scope auto list = new EmployeeList(); - - // EmployeeList owns its items, so we must surrender ownership of objects we add. - e.disownMemory(); - list.addEmployee(e); - Stdout( "----------------------" ).newline; - - // Now we access the first four items in list (three are C++ objects that - // EmployeeList's constructor adds, the last is our CEO). The virtual - // methods of all these instances are treated the same. For items 0, 1, and - // 2, all methods resolve in C++. For item 3, our CEO, getTitle calls - // getPosition which resolves in D. The call to getPosition is - // slightly different, however, because of the overridden getPosition() call, since - // now the object reference has been "laundered" by passing through - // EmployeeList as an Employee*. Previously, D resolved the call - // immediately in CEO, but now D 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 D 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 D implementation - // in CEO. All this routing takes place transparently. - - Stdout( "(position, title) for items 0-3:" ).newline; - Stdout.formatln( " {}, '{}'", list.getItem(0).getPosition(), list.getItem(0).getTitle() ); - Stdout.formatln( " {}, '{}'", list.getItem(1).getPosition(), list.getItem(1).getTitle() ); - Stdout.formatln( " {}, '{}'", list.getItem(2).getPosition(), list.getItem(2).getTitle() ); - Stdout.formatln( " {}, '{}'", list.getItem(3).getPosition(), list.getItem(3).getTitle() ); - Stdout( "----------------------" ).newline; - - // All Employees will be destroyed when the EmployeeList goes out of scope, - // including the CEO instance. - } - Stdout( "----------------------" ).newline; - - // All done. - Stdout( "Exiting cleanly from D code." ).newline; -} |