From phil at geog.ubc.ca  Mon Apr 24 22:35:05 2000
From: phil at geog.ubc.ca (Phil Austin)
Date: Mon, 24 Apr 2000 13:35:05 -0700 (PDT)
Subject: [C++-SIG] help with CXX-4.2 and add_keyword_method
Message-ID: <14596.45049.483478.431140@brant.geog.ubc.ca>

I'm trying to use add_keyword_method in the appended code
and am getting the following errors from KCC-3.4f under
Solaris 5.6.  Am I guessing wrong as to the correct 
synax? 

Thanks Phil

"/home/phil/include/CXX-4.2/CXX_Extensions.h", line 164: error: no instance of
          constructor
          "Py::MethodDefExt<T>::MethodDefExt [with T=testkey_module]" matches
          the argument list
            argument types are: (const char *,
                      Py::ExtensionModule<testkey_module>::method_keyword_funct
                      ion_t, PyObject *(PyObject *, PyObject *, PyObject *),
                      const char *)
  			name,
  			^
          detected during instantiation of "void
                    Py::ExtensionModule<T>::add_keyword_method(const char *,
                    Py::ExtensionModule<T>::method_keyword_function_t, const
                    char *) [with T=testkey_module]" at line 20 of "testkey.cc"


#include "Python.h"
#include "CXX_Objects.h"
#include "CXX_Extensions.h"

#include <algorithm>
USING(namespace Py)
USING(namespace std)

extern "C" void inittestkey();

class testkey_module : public ExtensionModule<testkey_module>
{
public:
	testkey_module()
		: ExtensionModule<testkey_module>( "testkey" )
	{
		add_varargs_method("sum", &testkey_module::ex_sum, "testing");
		add_keyword_method("sum2", &testkey_module::ex_sum2, "testing2");

		initialize( "documentation for the testkey module" );

		Dict d( moduleDictionary() );

		d["a_constant"] = Int(12);
	}

	virtual ~testkey_module() {}

private:

	Object ex_sum (const Tuple &a)
	{
	  cout << a[0] << endl;
	  return a[0];
	}

 	Object ex_sum2 (const Tuple &a, const Dict &b)
 	{
 	  cout <<  a[1] << endl;
 	  return a[1];
 	}
};

void inittestkey()
{
	static testkey_module *testkey = new testkey_module;
}



From barry at scottb.demon.co.uk  Fri Apr 28 21:43:48 2000
From: barry at scottb.demon.co.uk (Barry Scott)
Date: Fri, 28 Apr 2000 20:43:48 +0100
Subject: [C++-SIG] help with CXX-4.2 and add_keyword_method
In-Reply-To: <14596.45049.483478.431140@brant.geog.ubc.ca>
Message-ID: <000001bfb14a$12a7db30$060210ac@private>

There is a bug in the keyword template. I got the types of the call back handlers wrong
and the C++ compiler is rightly very upset.

I have fixed the problem and added a test to the demo software. This works well under
Windows with Visual C++ 6.0.

I have seen this compile clean under G++ 2.95.2 on FreeBSD. But it does not run because
of undefined symbol "cout" (which should not be used as we use std::cout everywhere).

Attached are two files:

Demo\example.cxx adds a test function "kw" to the Demo.
Include\CXX_Extensions.h contains the fix to correctly support keyword functions.

Example output:

Python 1.5.2 (#0, Apr 13 1999, 10:51:12) [MSC 32 bit (Intel)] on win32
Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam
>>> import example
>>> example.kw
<built-in method kw of tuple object at 8285d8>
>>> example.kw.__doc__
'kw()'
>>> example.kw('fred',12,name='barry',size='big',test=1)
Called with 2 normal arguments.
and with 3 keyword arguments:
    size
    name
    test
0
>>>

		BArry
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