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I'd like to get the index of the minimal element of a py::array_t variable in pybind11, but I encountered a problem when trying to combine std::distance and std::min_element.

let's say the py::array_t variable is named arr, the following code will get stuck when it's running:

std::distance(arr.begin(), std::min_element(arr.begin(), arr.end()))

initially I was thinking the py::array_t iterator is not compatible with std::distance function, but I did a test and the following code just works fine:

std::distance(arr.begin(), arr.end())

Can someone explain why the first one does not work? Thanks a lot.

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    Are you sure py:array_t is contiguous in memory? I never used numpy/pybind. But when I look at numpy/array_t it seems to be a more complicated datastructure than std::array is (and its operations suggest dynamic memory allocation is in play) Commented Jan 5 at 13:44
  • Why would it matter whether the memory is contiguous, as long as the iterators are implemented correctly and are of the correct categories? Commented Jan 5 at 13:50
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