{

std::cout << "choose bubble sort ." << std::endl;

// 每次循环，让 [current_loop_len] 变成本次循环的最大值

for (size_t current_loop_len = num - 1; current_loop_len > 0; current_loop_len--) {

#ifdef DEBUG

std::cout << "-------------- loop time " << (num - current_loop_len) << " start "

<< "---------------" << std::endl;

#endif

for (size_t current_index = 0; current_index < current_loop_len; current_index++) {

T* current_data = data + current_index;

T* bigger_data = data + current_index + 1;

#ifdef DEBUG

std::cout << *current_data << " - " << *bigger_data << " change to ";

#endif

if (*current_data > *bigger_data) {

T temp = *current_data;

*current_data = *bigger_data;

*bigger_data = temp;

}

#ifdef DEBUG

std::cout << *current_data << " - " << *bigger_data << std::endl;

#endif

}

#ifdef DEBUG

std::cout << "-------------- loop time " << (num - current_loop_len) << " result "

<< "--------------" << std::endl;

show_data(data, num);

std::cout << "-------------- loop time " << (num - current_loop_len) << " end "

<< "-----------------" << std::endl << std::endl;

#endif

}