调整数组顺序使奇数位于偶数前面

//调整数组顺序使奇数位于偶数前面:
void reorderOddEven(int* pData, unsigned int length){
    if (pData == nullptr || length <= 0)
        return;
    int* pBegin = pData;
    int* pEnd = pData + length - 1;
    while (pBegin < pEnd){
        while (pBegin != pEnd && (*pBegin & 0x1) == 1){
            pBegin++;
        }
        while (pEnd != pBegin && (*pEnd & 0x1) == 0){
            pEnd--;
        }
        if (pBegin < pBegin){
            int temp = *pBegin;
            *pBegin = *pEnd;
            *pEnd = temp;
        }
    }
}
//可扩展性的写法：使用函数指针
void reorder(int* pData, unsigned int length, bool (*func)(int)){
    if (pData == nullptr || length <= 0)
        return;
    int* pBegin = pData;
    int* pEnd = pData + length - 1;
    while (pBegin < pEnd){
        while (pBegin < pEnd && !func(*pBegin))
            pBegin++;
        while (pEnd > pBegin && func(*pEnd))
            pEnd--;
        if (pBegin < pEnd){
            int temp = *pBegin;
            *pBegin = *pEnd;
            *pEnd = temp;
        }
    }
}
bool isEven(int a){
    return (a & 0x1);
}
void reorderOddEven(int* pData, unsigned int length){
    reorder(pData, length, isEven);
}