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two director examples for python

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git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@4447 626c5289-ae23-0410-ae9c-e8d60b6d4f22
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Mark Rose 2003-03-07 10:26:56 +00:00
commit 8db3f9e8df
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22
Examples/python/callback/Makefile Normal file
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TOP = ../..
SWIG = $(TOP)/../swig
CXXSRCS = example.cxx
TARGET = example
INTERFACE = example.i
LIBS = -lm
SWIGOPT =
SWIGLIB = SWIG_LIB=/b/mrose/projects/swig/SWIG/Lib
all::
$(MAKE) -f $(TOP)/Makefile $(SWIGLIB) CXXSRCS='$(CXXSRCS)' SWIG='$(SWIG)' \
SWIGOPT='$(SWIGOPT)' TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' python_cpp
static::
$(MAKE) -f $(TOP)/Makefile $(SWIGLIB) CXXSRCS='$(CXXSRCS)' SWIG='$(SWIG)' \
SWIGOPT='$(SWIGOPT)' TARGET='mypython' INTERFACE='$(INTERFACE)' python_cpp_static
clean::
$(MAKE) -f $(TOP)/Makefile python_clean
rm -f $(TARGET).py
check: all

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Examples/python/callback/example.cxx Normal file
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/* File : example.cxx */
#include "example.h"

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Examples/python/callback/example.h Normal file
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/* File : example.h */
#include <cstdio>
#include <iostream>
class Callback {
public:
virtual ~Callback() { std::cout << "Callback::~Callback()" << std:: endl; }
virtual void run() { std::cout << "Callback::run()" << std::endl; }
};
class Caller {
private:
Callback *_callback;
public:
Caller(): _callback(0) {}
~Caller() { delCallback(); }
void delCallback() { if (_callback) delete _callback; _callback = 0; }
void setCallback(Callback *cb) { delCallback(); _callback = cb; }
void call() { if (_callback) _callback->run(); }
};

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Examples/python/callback/example.i Normal file
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/* File : example.i */
%module(directors="1") example
%{
#include "example.h"
%}
%include "typemaps.i"
%include "std_vector.i"
%include "std_string.i"
/* turn on director wrapping Callback */
%feature("director") Callback;
%include "example.h"

21
Examples/python/callback/index.html Normal file
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<html>
<head>
<title>SWIG:Examples:python:callback</title>
</head>
<body bgcolor="#ffffff">
<tt>SWIG/Examples/python/extend/</tt>
<hr>
<H2>Implementing C++ callbacks in Python</H2>
<tt>$Header$</tt><br>
<p>
This example illustrates how to use directors to implement C++ callbacks in Python.
<hr>
</body>
</html>

66
Examples/python/callback/runme.py Normal file
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# file: runme.py
# This file illustrates the cross language polymorphism using directors.
import example
# CEO class, which overrides Employee::getPosition().
class PyCallback(example.Callback):
def __init__(self):
example.Callback.__init__(self)
def run(self):
print "PyCallback.run()"
def __del__(self):
print "PyCallback.__del__()"
# for shadow class extensions that are not "disowned" and
# define a __del__ method, it is very important to call the
# base class __del__. otherwise the c++ objects will never
# be deleted.
example.Callback.__del__(self)
# Create an Caller instance
caller = example.Caller()
# Add a simple C++ callback (caller owns the callback, so
# we disown it first by clearing the .thisown flag).
print "Adding and calling a normal C++ callback"
print "----------------------------------------"
callback = example.Callback()
callback.thisown = 0
caller.setCallback(callback)
caller.call()
caller.delCallback();
print
print "Adding and calling a Python callback"
print "------------------------------------"
# Add a Python callback (caller owns the callback, so we
# disown it first by calling __disown__).
caller.setCallback(PyCallback().__disown__())
caller.call()
caller.delCallback()
print
print "Adding and calling another Python callback"
print "------------------------------------------"
# Lets do the same but use the weak reference this time.
callback = PyCallback().__disown__()
caller.setCallback(callback)
caller.call()
caller.delCallback()
# All done.
print
print "python exit"