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efficient 2d array implementation refer : https://stackoverflow.com/a/936709/1496826
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| // based on https://stackoverflow.com/a/936709/1496826 | |
| template <typename T,typename sizeDim=size_t> | |
| struct array2d{ | |
| T *arr; | |
| sizeDim row,col; | |
| array2d(sizeDim r,sizeDim c,T defVal=0):row(r),col(c){ | |
| arr = new T[r*c]; | |
| for (sizeDim i = 0; i < r; ++i){ | |
| for (sizeDim j = 0; j < c; ++j){ | |
| get(i,j) = defVal; | |
| } | |
| } | |
| } | |
| T& get(sizeDim ri,sizeDim ci) const{ | |
| if(ri >= row|| ci >= col){ | |
| cout << "invalid array index"; | |
| } | |
| return arr[ri*col+ci]; | |
| } | |
| T operator()(sizeDim ri,sizeDim ci) const{ | |
| return get(ri,ci); | |
| } | |
| ~array2d(){ | |
| delete[] arr; | |
| } | |
| void print() const{ | |
| for (sizeDim i = 0; i < row; ++i){ | |
| for (sizeDim j = 0; j < col; ++j){ | |
| cout << get(i,j) << "\t"; | |
| } | |
| cout << "\n"; | |
| } | |
| } | |
| }; | |
| int main(){ | |
| array2d<int> arr1(3,4,5); | |
| arr1.print(); | |
| } |
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