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  1. #include <iostream>
  2. #include <vector>
  3. #include <cstring>
  4.  
  5. typedef char  BYTE;
  6. typedef BYTE  INT8;
  7. typedef short INT16;
  8. typedef int   INT32;
  9.  
  10. template <typename T>
  11. class ImageData{
  12.     public:
  13.         ImageData(int);
  14.         ~ImageData();
  15.         void  setDataType(int); //設定資料儲存bits數
  16.         int   getData(int);     //讀取第n筆資料
  17.  
  18.     private:
  19.         BYTE* data;             //原始圖資
  20.         int bits;
  21.         int size;
  22. };
  23.  
  24. template <typename T>
  25. ImageData<T>::ImageData(int size){
  26.     if(size < sizeof(T))
  27.         throw std::string("Size must more than sizeof(T)");
  28.  
  29.     data = new (std::nothrow) BYTE[size];
  30.     if(data == NULL)
  31.         throw std::string("Memory allocation fail");
  32.  
  33.     this->size = size;
  34.     memset(data, 0, sizeof(BYTE) * this->size);
  35.  
  36.     *((int*)data) = (int)sizeof(T);         // 只是方便觀察(非必要)
  37. }
  38.  
  39. template <typename T>
  40. ImageData<T>::~ImageData(){
  41.     if(data != NULL){
  42.         delete [] data;
  43.     }
  44. }
  45.  
  46. template <typename T>
  47. void ImageData<T>::setDataType(int inputBits){
  48.     bits = inputBits;
  49. }
  50.  
  51. template <typename T>
  52. int ImageData<T>::getData(int pos){
  53.     decltype(data) endPtr = data + pos + sizeof(T);
  54.     decltype(data) bound = data + size;
  55.  
  56.     // Boundary check
  57.     if(endPtr > bound)
  58.         throw std::string("Out of boundary");
  59.  
  60.     return (int) *((T*)data + pos);
  61. }
  62.  
  63. int main(){
  64.     try{
  65.         // Case1:INT8
  66.         {
  67.             ImageData<INT8>* img = new ImageData<INT8>(128);
  68.             std::cout << img->getData(0) << std::endl;
  69.         }
  70.  
  71.         // Case1:INT16
  72.         {
  73.             ImageData<INT16>* img = new ImageData<INT16>(128);
  74.             std::cout << img->getData(0) << std::endl;
  75.         }
  76.  
  77.         // Case1:INT32
  78.         {
  79.             ImageData<INT32>* img = new ImageData<INT32>(128);
  80.             std::cout << img->getData(0) << std::endl;
  81.         }
  82.     }
  83.     catch(std::string e){
  84.         std::cout << "Exception: " << e << std::endl;
  85.     }
  86.     catch(std::exception e){
  87.         std::cout << "Exception: " << e.what() << std::endl;
  88.     }
  89. 	return 0;
  90. }
Success #stdin #stdout 0s 3232KB
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https://ideone.com/dMMrV9
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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