Actually, I haven't had time to investigate it deeper yet, but it seems to be a
pyplusplus's bug. I also haven't found anything relevant on the net, so here we go:
Test case:
class to be exposed (file a.h)
#include <boost/operators.hpp>
class A: boost::equality_comparable<A>
{
public:
A(int a): a(a) {};
bool operator==(A const & other) const
{
return this->a == other.a;
}
private:
int a;
};
generator used (gen.py):
from pyplusplus import module_builder
mb = module_builder.module_builder_t(files = ['a.h'])
mb.decl('alloca').exclude()
mb.build_code_creator( module_name = 'testA')
mb.write_module('testA.cpp')
file generated:
// This file has been generated by Py++.
#include "boost/python.hpp"
#include "a.h"
namespace bp = boost::python;
BOOST_PYTHON_MODULE(testA){
{ //::A
typedef bp::class_< A > A_exposer_t;
A_exposer_t A_exposer = A_exposer_t( "A", bp::init< int >((
bp::arg("a") )) );
bp::scope A_scope( A_exposer );
bp::implicitly_convertible< int, A >();
A_exposer.def( bp::self == bp::self );
// OOPS! something is missing here
}
}
C++ class test:
#include <iostream>
#include "a.h"
using namespace std;
int main()
{
A a1(3);
A a2(3);
cout << "a1 == a2: " << (a1 == a2) << endl;
cout << "a1 != a2: " << (a1 != a2) << endl;
return 0;
}
C++ class test result:
a1 == a2: 1
a1 != a2: 0
python test:
>>> import testA
>>> a1 = testA.A(3)
>>> a2 = testA.A(3)
>>> a1 == a2
True
>>> a1 != a2
True # drat!
The reason: missing A_exposer.def( bp::self != bp::self ); in the generated
code;
If any of you think it is easy to fix in pyplusplus (Roman, perhaps you're the
one to know best?) I may try. I'm also considering a workaround of checking
bases for all the classes and add missing "self != self" for all those which
derive from equality_comparable;
Perhaps there is the same problem with less_than_comparable and others.
regards,
Kuba
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