Merge pull request #176 from PerretB/py_container_from_null

Abort array/tensor construction if pyobject is not valid

Author: JohanMabille

include/xtensor-python/pyarray.hpp

@@ -744,6 +744,11 @@ namespace xt
     template <class T, layout_type L>
     inline void pyarray<T, L>::init_from_python()
     {
+        if (!static_cast<bool>(*this))
+        {
+            return;
+        }
+        
         m_shape = inner_shape_type(reinterpret_cast<size_type*>(PyArray_SHAPE(this->python_array())),
                                    static_cast<size_type>(PyArray_NDIM(this->python_array())));
         m_strides = inner_strides_type(reinterpret_cast<difference_type*>(PyArray_STRIDES(this->python_array())),

include/xtensor-python/pytensor.hpp

@@ -442,6 +442,11 @@ namespace xt
     template <class T, std::size_t N, layout_type L>
     inline void pytensor<T, N, L>::init_from_python()
     {
+        if (!static_cast<bool>(*this))
+        {
+            return;
+        }
+        
         if (PyArray_NDIM(this->python_array()) != N)
         {
             throw std::runtime_error("NumPy: ndarray has incorrect number of dimensions");