feat(cpp-object-oriented-modular-refactoring): step 10 - dense-blas-adapter

src/fesa/math/dense_blas_internal.h

@@ -0,0 +1,26 @@
+#ifndef FESA_SRC_FESA_MATH_DENSE_BLAS_INTERNAL_H_
+#define FESA_SRC_FESA_MATH_DENSE_BLAS_INTERNAL_H_
+
+#include <mkl.h>
+
+#include <cstddef>
+
+#include "fesa/core/status.h"
+
+namespace fesa::dense_blas_internal {
+
+/// @brief Converts a dense storage length to the private MKL integer type.
+/// @return The converted length or an uncategorized overflow failure.
+Result<MKL_INT> ToMklSize(std::size_t size);
+
+/// @brief Copies contiguous double values through the private BLAS backend.
+/// @param source Readable storage for size values when size is nonzero.
+/// @param size Number of contiguous values to copy.
+/// @param destination Writable storage for size values when size is nonzero.
+/// @throws std::length_error if size exceeds the MKL integer range.
+/// @note A zero-length copy accepts null pointers and does not call BLAS.
+void CopyValues(const double* source, std::size_t size, double* destination);
+
+}  // namespace fesa::dense_blas_internal
+
+#endif  // FESA_SRC_FESA_MATH_DENSE_BLAS_INTERNAL_H_