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lsstcppimport.cc
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1 /*
2  * LSST Data Management System
3  * Copyright 2008-2016 AURA/LSST.
4  *
5  * This product includes software developed by the
6  * LSST Project (http://www.lsst.org/).
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22 
23 #include "pybind11/pybind11.h"
24 
26 
27 namespace lsst {
28 namespace base {
29 
31 public:
32  static ModuleImporter const* get() {
33  static PythonModuleImporter const instance;
34  return &instance;
35  }
36 
37 private:
39 
40 protected:
41  virtual bool _import(std::string const& name) const;
42 };
43 
44 bool PythonModuleImporter::_import(std::string const& name) const {
45  PyObject* mod = PyImport_ImportModule(name.c_str());
46  if (mod) {
47  Py_DECREF(mod);
48  return true;
49  } else {
50  // If the Python C API call returned a null pointer, it will
51  // also have set an exception. We don't want that, because
52  // this isn't necessarily an error (that's up to the caller).
53  PyErr_Clear();
54  }
55  return false;
56 }
57 
58 void installPythonModuleImporter() { ModuleImporter::install(PythonModuleImporter::get()); }
59 }
60 } // namespace lsst::base
61 
62 namespace py = pybind11;
63 
64 PYBIND11_PLUGIN(_lsstcppimport) {
65  py::module mod("_lsstcppimport", "Access to the classes from the lsstcppimport library");
66 
68 
69  return mod.ptr();
70 }
Base class that defines an interface for importing Python modules.
virtual bool _import(std::string const &name) const
void installPythonModuleImporter()
static ModuleImporter const * get()
PYBIND11_PLUGIN(_lsstcppimport)
Mechanism for safely importing Python modules from C++; should not be included except by its own impl...