Boost Python binding Vector of a Class

Question

I am trying to create a python binding for a C++ class using Boost Python

#include <boost/python.hpp>
#include <boost/python/suite/indexing/vector_indexing_suite.hpp>
#include <vector>

using namespace boost::python;

struct World
{
    void set(std::string msg) { this->msg = msg; }

    std::string greet() { return msg; }

    MyList2 getList() {
        MyList v1(5, 1), v2(10, 2);
        MyList2 v;
        v.push_back(v1);
        v.push_back(v2);
        std::cout<<"In C++: "<<v.size()<<std::endl;
        return v;
    }

    std::string msg;
};


BOOST_PYTHON_MODULE(test_ext)
{
    class_< std::vector<World> >("MyList")
        .def(vector_indexing_suite< std::vector<World> >() );

    class_<World>("World")
        .def("greet", &World::greet)
        .def("set", &World::set)
        .def("list", &World::getList)
    ;
}

But i am getting compilation error with vector indexing suite when trying to bind vector of a class.

no match for ‘operator==’ in ‘__first.__gnu_cxx::__normal_iterator<_Iterator, _Container>::operator* [with _Iterator = World*, _Container = std::vector<World>, __gnu_cxx::__normal_iterator<_Iterator, _Container>::reference = World&]() == __val’

define MyList and MyList2

Neel Basu
– Neel Basu

2016-03-10 08:06:28 +00:00
Commented Mar 10, 2016 at 8:06 — Neel Basu
– Neel Basu, Commented Mar 10, 2016 at 8:06

Drise · Accepted Answer · 2012-07-27 20:58:10Z

2

Python lists have quite a bit more functionality than C++ vectors. vector_indexing_suite defines contains method among others, so your container class has to define operator==.

edited Jul 27, 2012 at 20:58

Drise

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answered Jul 27, 2012 at 20:47

Aleksey Vitebskiy

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1 Comment

Aleksey Vitebskiy Over a year ago

I was typing this answer on my tablet from a car going 85mph. Not going to attempt that again :)

Community · Accepted Answer · 2017-05-23 12:15:29Z

1

For why we need to define the operators, I think following can be checked out:

why do I need comparison operators in boost python vector indexing suite?

edited May 23, 2017 at 12:15

CommunityBot

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answered Jul 28, 2012 at 2:59

dpatro

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