File content as of revision 7:9cd16581b578:

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#ifndef MaximInterfaceCore_ChangeSizeType
#define MaximInterfaceCore_ChangeSizeType

#include <stdint.h>
#include <algorithm>
#include <limits>
#include "span.hpp"
#include "system_error.hpp"

namespace MaximInterfaceCore {

/// @brief
/// Adapts functions taking an array pointer and size where the size type is
/// nonstandard.
/// @tparam NewSize Nonstandard size type.
/// @tparam Func Must be callable as func(Data *, NewSize).
/// @tparam Data Array element type.
/// @param func Callback for processing chunks of data.
/// @param data Data to process with callback.
template <typename NewSize, typename Func, typename Data>
error_code changeSizeType(Func func, span<Data> data) {
  typedef typename span<Data>::index_type DataSize;

  error_code result;
  // Check if NewSize can represent the maximum value of DataSize.
  if (static_cast<uintmax_t>(std::numeric_limits<DataSize>::max()) >
      static_cast<uintmax_t>(std::numeric_limits<NewSize>::max())) {
    DataSize dataIdx = 0;
    do {
      const span<Data> chunk = data.subspan(
          dataIdx, std::min<DataSize>(data.size() - dataIdx,
                                      std::numeric_limits<NewSize>::max()));
      result = func(chunk.data(), static_cast<NewSize>(chunk.size()));
      dataIdx += chunk.size();
    } while (dataIdx < data.size() && !result);
  } else {
    result = func(data.data(), static_cast<NewSize>(data.size()));
  }
  return result;
}

} // namespace MaximInterfaceCore

#endif