[C++ pyclustering] Human-readable errors to Python

Introduction The current problem is following: in case of incorrect input data or due to some other reason (even unexpected) - C++ code throws exception that is not captured by anyone. As a result the client (python code) receives error code that is not readable. Here is an example of an error:

[WinError -529697949] Windows Error 0xe06d7363

The idea is to capture each exception in pyclustering interface and report about the problem to the client of the library, in this case - python pyclustering library.

Description C++ pyclustering interface ccore/include/interface/ and ccore/src/interface/.

The idea is to capture all exception, for example, there is a function:

pyclustering_package * agglomerative_algorithm(const pyclustering_package * const p_sample, const size_t p_number_clusters, const size_t p_link) {
    pyclustering::clst::agglomerative algorithm(p_number_clusters, (pyclustering::clst::agglomerative::type_link) p_link);

    /* ... ... ... */

    return package;
}

Wrap it by try catch block:

pyclustering_package * agglomerative_algorithm(const pyclustering_package * const p_sample, const size_t p_number_clusters, const size_t p_link) try {
    pyclustering::clst::agglomerative algorithm(p_number_clusters, (pyclustering::clst::agglomerative::type_link) p_link);

    pyclustering::dataset data;
    p_sample->extract(data);

    pyclustering::clst::agglomerative_data result;
    algorithm.process(data, result);

    pyclustering_package * package = create_package(&result.clusters());

    return package;
} 
catch (std::exception & p_error) {
    return pyclustering_pachage_from_exception(p_error);
}

Useful links

• How to prepare working copy: https://github.com/annoviko/pyclustering/wiki/Working-Copy-Preparation
• How to build C++ pyclustering: https://github.com/annoviko/pyclustering/wiki/Cpp-PyClustering
• How to run C++ unit-tests: https://github.com/annoviko/pyclustering/wiki/Unit-Testing-CCORE

Functionality to cover All exported functions that return pyclustering_package:

• agglomerative_interface.cpp
• bsas_interface.cpp
• clique_interface.cpp
• cure_interface.cpp
• dbscan_interface.cpp
• elbow_interface.cpp
• fcm_interface.cpp
• gmeans_interface.cpp
• hhn_interface.cpp
• hsyncnet_interface.cpp
• kmeans_interface.cpp
• kmedoids_interface.cpp
• legion_interface.cpp
• mbsas_interface.cpp
• metric_interface.cpp
• optics_interface.cpp
• pcnn_interface.cpp
• rock_interface.cpp
• silhouette_interface.cpp
• som_interface.cpp
• sync_interface.cpp
• syncnet_interface.cpp
• syncpr_interface.cpp
• ttsas_interface.cpp
• xmeans_interface.cpp