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Questions tagged [cppyy]

cppyy is a Python module for using C++ code inside python.

cppyy is a Python module for using C++ code inside python.

59 questions
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Typehinting custom collection class in dataclass

I have created a custom Python class, for use in dataclasses, that accepts python lists, but internally stores them as a C++ vector (interfaced with CERN ROOT). The type of what is stored in the vector is specified as a string during init.…
Lech Wiktor Piotrowski
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using nlohmann::json with cppyy?

Is it possible to pass a python dict into a function expecting a nlohmann::json (nlohmann/json) object via cppyy? This question has to have come up by now, but I wasn't able to find anything on it. Minimal example to reproduce (without regard to…
Siraj Qazi
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Segmentation Violation when passing pointer to base in CPPYY

The following code is a minimal example of this strange error. The constructor of bar takes a pointer to the base class BaseFoo as argument. When I tried to make a list of three BaseFoo pointers and create a Bar object for each of them, I get…
Max Wong
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Calling C++ function from python with cppyy

I need to use cppyy to call functions from a 3rd-party C++ library in Python. To start I wrote a simple C++ function and tried to load it in Python: test.hpp class Test { public: void test(); }; test.cpp #include #include…
Natanel Birarov
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How to install python modules using cppyy?

I want to package a python module containing python source and a native c++ library. Cppyy is used to dynamically generate the bindings so the library is really just a normal library. The build system for the library is meson and should not be…
lweber
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Where is the cppyy source code for pyhonizing STL vector, etc

cppyy does pythonizations for various C++ STL entities. Where in the cppyy source code are these pythonizations done? In particular, vector? I am hoping to find examples I can imitate
Edward C. Jones
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Error with linking flag when using the cmake build for cppyy

I am trying to build the example for a make build for cppyy in the cppyy-knearestneighbors example (https://github.com/jclay/cppyy-knearestneighbors-example). From what I understand it used the more modern cppyy cmake. However when it comes to the…
Eddie Shields
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Read char16_t* String in user defined struct with cppyy from c++

According to this question: Read char16_t* String with cppyy from c++ I have a new problem with the char16_t* in a user defined struct. Given a C++ function: MLPI_API MLPIRESULT mlpiMotionGetConfiguredAxes(const MLPIHANDLE connection,…
araisch
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Calling boost rtree from python

I am trying to adapt this boost rtree example so that python calls the c++ libraries. This is my first attempt at calling c++ from python. I am using cppyy 1.8.5 (python version 3.6.7) and boost rtree header-only library (boost version 1.58) on…
enkinpo
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error: use of undeclared identifier 'LP_c_uint'

I am using cppyy in my project to call C APIs. I get below error log captured by capfd plugin in pytest, when an exception happens: input_line_33:2:11: error: use of undeclared identifier 'LP_c_uint' (sizeof (LP_c_uint)) It is coming from below…
Rajat Verma
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Unable to import cppyy in Pyhon

Although I have installed cppyy-cling, cppyy-backend, CPyCppyy and cppyy (in that order) using pip3 install, I am unable to do a basic import of cppyy from the Python3 prompt. Python 3.6.9 (default, Oct 8 2020, 12:12:24) [GCC 8.4.0] on linux Type…
user13477493
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Pointer Variable raise error as unknown type when using cppyy in python

So I have this sdk and here is the documentation which is in c++ which so I installed cppyy but when I include the header file with cppyy in python it raises error // MysticLight_SDK.h : header file // #pragma once typedef int…
sarfaraz saleem
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Are unreadable error messages form CGAL or cppyy?

I have trying to wrap a small part of CGAL (Computational Geometry Algorithms Library) using cppyy. I get completely unreadable error messages. Are these messages just being passed through from CGAL? Here is one of the messages. I have chopped…
Edward C. Jones
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In conda environment, "include cppyy" in python causes a seg fault

I am working in a anaconda environment use cppyy. For a few hours I have been getting segfaults when I import cppyy into python: (CPPYY) > python Python 3.9.7 | packaged by conda-forge | (default, Sep 29 2021, 19:20:46) [GCC 9.4.0] on linux Type…
Edward C. Jones
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