指針移位數組C++

Question

我試圖儘可能有效地移動我的數組。即時通訊使用指針，現在，有麻煩分配值回我的數組IM：

void stack::rotate(int nRotations) 
{ 
    if (count <= 1) return; 

    int *intFrontPtr = &items[top+1].n; 
    int *intBackPtr = &items[count-1].n; 
    int temp = 0; 

    for (int shift = 0; nRotations != 0 ;) 
    { 
     if (nRotations > 0) // we rotate left 
     { 
      temp = *++intFrontPtr; // give temp the value 
      items[++shift].n = temp; // debug shows success 
      if (shift == count) // dont overrun array 
      { 
       temp = *intBackPtr; 
       items[count-1].n = temp; 
       shift = 0; // reset for another rotation 
       nRotations--; // decrement we have reached the end 
      } 
     } 

    } 
} 

Answer 1

C++有建在<algorithm>的功能。只需撥打std::rotate(front_ptr, front_ptr + N, back_ptr);