PythonInitializerSingleton Class Reference

Singleton class which handles the initialization and finalization of Python and numpy. More...

Public Member Functions
	PythonInitializerSingleton (const PythonInitializerSingleton &)=delete
	Forbid copy constructor of PythonInitializerSingleton.

Static Public Member Functions
static PythonInitializerSingleton &	GetInstance ()
	Return static instance of PythonInitializerSingleton.

Private Member Functions
	PythonInitializerSingleton ()
	Constructor of PythonInitializerSingleton.
	~PythonInitializerSingleton ()
	Destructor of PythonInitializerSingleton.
void *	init_numpy ()
	Helper function which initializes array system of numpy.

Private Attributes
bool	m_initialized_python = false
	Member which keeps indicate if this class initialized python.

Detailed Description

Singleton class which handles the initialization and finalization of Python and numpy.

Definition at line 82 of file Python.cc.

Constructor & Destructor Documentation

PythonInitializerSingleton()

PythonInitializerSingleton ( )

inlineprivate

Constructor of PythonInitializerSingleton.

Definition at line 99 of file Python.cc.

      {
        if (not Py_IsInitialized()) {
          Py_Initialize();
          // wchar_t* bla[] = {L""};
          wchar_t** bla = nullptr;
          PySys_SetArgvEx(0, bla, 0);
          m_initialized_python = true;
        }
 
        if (PyArray_API == nullptr) {
          init_numpy();
        }
      }

~PythonInitializerSingleton()

~PythonInitializerSingleton ( )

inlineprivate

Destructor of PythonInitializerSingleton.

Definition at line 117 of file Python.cc.

      {
        if (m_initialized_python) {
          if (Py_IsInitialized()) {
            // We don't finalize Python because this call only frees some memory,
            // but can cause crashes in loaded python-modules like Theano
            // https://docs.python.org/3/c-api/init.html
            // Py_Finalize();
          }
        }
      }

Member Function Documentation

GetInstance()

PythonInitializerSingleton & GetInstance ( )

static

Return static instance of PythonInitializerSingleton.

Definition at line 144 of file Python.cc.

    {
      static PythonInitializerSingleton singleton;
      return singleton;
    }

init_numpy()

void * init_numpy ( )

inlineprivate

Helper function which initializes array system of numpy.

Since import_array is a weird macro we need this wrapper function to protect us from the return statement in this macro

Definition at line 134 of file Python.cc.

      {
        // Import array is a macro which returns NUMPY_IMPORT_ARRAY_RETVAL
        import_array();
        return nullptr;
      }

Member Data Documentation

m_initialized_python

bool m_initialized_python = false

private

Member which keeps indicate if this class initialized python.

Definition at line 141 of file Python.cc.

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The documentation for this class was generated from the following file:

• mva/methods/src/Python.cc