C++的常用轮子

最新推荐文章于 2025-11-06 22:28:19 发布

原创

最新推荐文章于 2025-11-06 22:28:19 发布 · 1k 阅读

7 ·

CC 4.0 BY-SA版权

1、统计程序运行时间

#include <sys/time.h>
#include <iostream>
#include <unistd.h>

using namespace std;

int main()
{
    struct timeval start_time, end_time;
    gettimeofday(&start_time, NULL);
    sleep(5);
    gettimeofday(&end_time, NULL);

    //cost_time的单位是微秒
    long cost_time = (end_time.tv_sec - start_time.tv_sec) * 1000000 + (end_time.tv_usec - start_time.tv_usec); 
    std::cout << "total cost time : " << cost_time/1000000 << endl;
    return 0;
}

2、分割字串函数

// 对字符串根据指定的单个字符进行拆分，返回分割后的字符串数组 
vector<string> SplitString(const string& obj_string, char character)
 {
     vector<string> string_vector;
     if (obj_string.size() == 0)
     {
         return string_vector;
     }     
 
     size_t pos_begin = 0;
     size_t pos_end = 0;
     bool last_obj_store = true;
 
     while (pos_end != string::npos)
     {
         pos_begin =