ChangeSizeType.hpp

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00032 
00033 #ifndef MaximInterfaceCore_ChangeSizeType_hpp
00034 #define MaximInterfaceCore_ChangeSizeType_hpp
00035 
00036 #include <stdint.h>
00037 #include <algorithm>
00038 #include <limits>
00039 #include "Result.hpp"
00040 #include "span.hpp"
00041 
00042 namespace MaximInterfaceCore {
00043 
00044 /// @brief
00045 /// Adapts functions taking an array pointer and size where the size type is
00046 /// nonstandard.
00047 /// @tparam NewSize Nonstandard size type.
00048 /// @tparam Func Must be callable as func(Data *, NewSize).
00049 /// @tparam Data Array element type.
00050 /// @param func Callback for processing chunks of data.
00051 /// @param data Data to process with callback.
00052 template <typename NewSize, typename Func, typename Data>
00053 Result<void> changeSizeType(Func func, span<Data> data) {
00054   typedef typename span<Data>::index_type DataSize;
00055 
00056   // Check if NewSize can represent the maximum value of DataSize.
00057   if (static_cast<uintmax_t>(std::numeric_limits<DataSize>::max()) >
00058       static_cast<uintmax_t>(std::numeric_limits<NewSize>::max())) {
00059     DataSize dataIdx = 0;
00060     do {
00061       const span<Data> chunk = data.subspan(
00062           dataIdx, std::min<DataSize>(data.size() - dataIdx,
00063                                       std::numeric_limits<NewSize>::max()));
00064       MaximInterfaceCore_TRY(
00065           func(chunk.data(), static_cast<NewSize>(chunk.size())));
00066       dataIdx += chunk.size();
00067     } while (dataIdx < data.size());
00068   } else {
00069     MaximInterfaceCore_TRY(
00070         func(data.data(), static_cast<NewSize>(data.size())));
00071   }
00072   return none;
00073 }
00074 
00075 } // namespace MaximInterfaceCore
00076 
00077 #endif