[cppyy] Add std::span converter with Python buffer support#21650
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guitargeek merged 2 commits intoroot-project:masterfrom Mar 23, 2026
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[cppyy] Add std::span converter with Python buffer support#21650guitargeek merged 2 commits intoroot-project:masterfrom
guitargeek merged 2 commits intoroot-project:masterfrom
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Test Results 22 files 22 suites 3d 4h 27m 38s ⏱️ For more details on these failures, see this check. Results for commit 8cd7282. ♻️ This comment has been updated with latest results. |
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The `PyBuffer_Release` function has its current interface since Python 3.1, which is long end-of-life, so we don't need to be backwards compatible for that. This also makes the code easier to understand because no unused arguments are passed around.
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Add a dedicated converter for `std::span` (C++20) to enable passing Python buffer-compatible objects to C++ functions expecting `std::span<T>`. The new StdSpanConverter supports: - Python buffer protocol (e.g. NumPy arrays, array.array) - Existing C++ objects (passed through as-is) - Automatic conversion from other C++ classes like `std::vector` - Both `std::span<T>` and `std::span<const T>` A typecode mapping utility is introduced to validate buffer formats against the expected C++ value type. Incompatible buffers now raise a descriptive TypeError indicating the expected and actual formats. A new unit test to validate these conversions is also implemented.
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Add a dedicated converter for
std::span(C++20) to enable passing Python buffer-compatible objects to C++ functions expectingstd::span<T>.The new StdSpanConverter supports:
std::vectorstd::span<T>andstd::span<const T>A typecode mapping utility is introduced to validate buffer formats against the expected C++ value type. Incompatible buffers now raise a descriptive TypeError indicating the expected and actual formats.
A new unit test to validate these conversions is also implemented.
This addresses an item in the ROOT plan of work 2026 (https://cern.ch/root-pow).