How to access elements of boost::python::tuple in C++?

Question

I have a C++ code called from Python. I have list of tuples passed from python:

boost::python::list<boost::python::tuple>

How do I access the elements of boost::python::tuple?

Any example would be handy. From the documentation, I can't find the accessor methods.

there must be a mapping function, and the methods are not fully documented. for a quick workaround try to build a custom wrapper (like this one for example) — Assaf Genosar
– Assaf Genosar, Commented Mar 9, 2021 at 8:19

Elad Maimoni · Accepted Answer · 2021-03-09 08:12:50Z

0

I was able to use the boost::python::extract<int>( ) method.

For example for a python tuple containing an integer and a string:

Python side:

t = (123, 'some string')

C++ side:

void work_with_tuple(boost::python::tuple t)
{
   if (boost::python::len(t) != 2) throw std::invalid_argument("bad");

   int extracted_int = boost::python::extract<int>(t[0]);
   std::string extracted_string = boost::python::extract<std::string>(t[1]);
}

edited Mar 9, 2021 at 8:12

Elad Maimoni

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answered Nov 19, 2016 at 0:42

ssk

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1 Comment

Mateen Ulhaq Over a year ago

@Ramy You may wish to write a separate answer containing the elaboration.

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