This helps ! Got it to work ! Thanks guys. Code attached for people who could need it.
Franck Le jeu. 30 janv. 2020 à 15:46, stefan <ste...@seefeld.name> a écrit : > > On 2020-01-29 4:01 p.m., HOUSSEN Franck wrote: > > With boost python tuple, how to loop over tuple items? In dummy.cpp > attached, I'd like to get line 8 to work. Afterwards, I noticed line 7 does > not even compile. How to get the length of a tuple (line 8), and, why there > could be some ambiguity (line 7). Any help / clue is appreciated. > > Hi Frank, > > there are a few minor issues with your code, let me address them > one-by-one to allow you to compile and run your example: > > * you don't need to link your extension module with the Python library. > Symbols from that library are provided by the interpreter itself. (You only > need to link to that when you embed the interpreter into your C++ app.) > > * you should not call `Py_Initialize()` during your module's > initialization. Again, that function only needs to be called when you embed > (and initialize) the interpreter itself. > > * use `boost::python::len(t)` to report the length of your tuple > > * the call `t[0]` itself is fine, but please be aware that it returns a > `boost::python::object` instance. You can convert to a (Python) string and > then extract the C++ string from that using > > std::string s = bpl::extract<std::string>(bpl::str(t[0])); > > and print that. > > Hope this helps, > [image: Stefan] > > -- > > ...ich hab' noch einen Koffer in Berlin... > > > _______________________________________________ > Cplusplus-sig mailing list > Cplusplus-sig@python.org > https://mail.python.org/mailman/listinfo/cplusplus-sig > -- Bonne journée, Franck HOUSSEN
#include <iostream>
#include <boost/python.hpp>
void doStuffs(boost::python::tuple & t) {
std::cout << "tuple " << std::endl;
for (size_t i = 0; i < len(t); i++) {
std::string s = boost::python::extract<std::string>(boost::python::str(t[i]));
std::cout << s << std::endl;
}
}
BOOST_PYTHON_MODULE(dummy) {
def("doStuffs", doStuffs);
}
Makefile
Description: Binary data
_______________________________________________ Cplusplus-sig mailing list Cplusplus-sig@python.org https://mail.python.org/mailman/listinfo/cplusplus-sig
