[C++-sig] Cplusplus-sig Digest, Vol 125, Issue 5

[Lewis Evans]

I suggest

(a) renaming as test.test is confusing, eg call the file/module test_file,
and the class test_class
(b) I think from your previous post that test.test() simply calls the
constructor for class test, and this constructor is defined in python,
returning an object not a pointer,
so perhaps try extract<Component> not extract<Component*>

Best

Lewis


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On Thu, May 14, 2020 at 5:00 PM <cplusplus-sig-request at python.org> wrote:

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>    1. Re: Cplusplus-sig Digest, Vol 125, Issue 3 (Carlos Duran)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 13 May 2020 17:50:16 +0200
> From: Carlos Duran <carlos_wurt at zohomail.eu>
> To: "cplusplus-sig" <cplusplus-sig at python.org>
> Subject: Re: [C++-sig] Cplusplus-sig Digest, Vol 125, Issue 3
> Message-ID:
>         <1720ebab660.12aad1dbc94224.6884088036261319526 at zohomail.eu>
> Content-Type: text/plain; charset="utf-8"
>
> Hello again,
>
>
>
> I rewrite part of the code, but I didn't find my error.
>
> My new code is:
>
> cat ../src/DemiWu.cpp
>
> #include <boost/python.hpp>
>
>
>
> #include <DemiComponent.hpp>
>
> #include <DemiWu.hpp>
>
> #include <iostream>
>
> #include <string>
>
>
>
> using namespace boost::python;
>
> using namespace DemiWu;
>
>
>
> #if PY_MAJOR_VERSION >= 3
>
> #?? define INIT_MODULE PyInit_DemiWu
>
> ??? extern "C" PyObject* INIT_MODULE();
>
> #else
>
> #?? define INIT_MODULE initDemiwu
>
> ??? extern "C" void INIT_MODULE();
>
> #endif
>
>
>
> int main()
>
> {
>
> ????? PyImport_AppendInittab((char*)"DemiWu", INIT_MODULE);
>
> ????? Py_Initialize();
>
> ????? object main = import("__main__");
>
> ????? object global = main.attr("__dict__");
>
> ????? PySys_SetPath(L".");
>
> ????? global["test"] = import("test"); // How can I check the import?
>
>
>
> ????? object funcObj = global["test"].attr("test");
>
> ????? std::cout << std::boolalpha;
>
> ????? std::cout << funcObj.is_none() << "\n"; // funcObj.is_none() == false
>
> ????? object resultObj = funcObj();
>
> ????? std::cout << resultObj.is_none() << "\n"; // resultObj.is_none() ==
> false
>
>
>
> ????? // I suppose that in "real" code I need to check every time I use
> attr method.
>
> ????? extract<std::string>
> exclass(funcObj.attr("__class__").attr("__name__"));
>
> ????? if(exclass.check())
>
> ????? ????? std::cout << "test.test.__class__.__name__: " << exclass() <<
> "\n"; // exclass() == "class"
>
> ????? extract<std::string>
> exclass2(resultObj.attr("__class__").attr("__name__"));
>
> ????? if(exclass2.check())
>
> ????? ????? std::cout << "test.test().__class__.__name__: " << exclass2()
> << "\n"; // exclass2() == "test"
>
> ????? extract<std::string>
> exbase(funcObj.attr("__base__").attr("__name__"));
>
> ????? if(exbase.check())
>
> ????? ????? std::cout << "test.test.__base__.__name__: " << exbase() <<
> "\n"; // exbase() == "Component"
>
> ????? // It seems that resultObj is correct, I think that I am using
> extract<> function wrong.
>
> ????? extract<Component*> ex(resultObj);
>
> ????? if(ex.check()){
>
> ????? ????? Component * const b=ex();
>
> ????? ????? b->on_create(); ?
>
> ????? ????? std::cout << "SUCCESS\n";
>
> ????? ????? return 0;
>
> ????? } else {
>
> ????? ????? std::cout << "FAIL\n"; // And again the program jumps here.
>
> ????? ????? return 1;
>
> ????? }
>
> }
>
>
>
> And the execution:
>
> ./DemiWu
>
> false
>
> false
>
> test.test.__class__.__name__: class
>
> test.test().__class__.__name__: test
>
> test.test.__base__.__name__: Component
>
> FAIL
>
>
>
> Thank you for your response
>
>
>
> Carlos
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