weixin_41977938的博客

int main(){ MYSQL *mysql_con = conn::Connect();//连接 if (mysql_con == nullptr) { printf("read_gantry_file sql connect error"); system("pause"); } char * query0 = "set names utf8"; mysql_query(mysql_con, query0);//设置编码格式.

需要重载operator <#include <iostream>#include <map>#include <vector>using namespace std;struct veh2url{ string str_license="-1"; string str_id="-1"; string str_time="-1"; bool operator < (const veh2url &e).

需要在架构体 定义时 添加operator#include <iostream>#include <map>#include <vector>#include <fstream>#include <assert.h>#include <algorithm>using namespace std;struct g{ int a; string b; bool operator == (..

#include <iostream>#include <map>#include <vector>#include <fstream>#include <assert.h>#include <algorithm>using namespace std;int main(){ map<int,int> m; m.insert(pair<int,int>(1,12)); .

#include <iostream>#include <map>#include <vector>#include <fstream>#include <assert.h>#include <algorithm>using namespace std;int main(){ multimap<int,int> m; m.insert(pair<int,int>(1,12));.

转自：https://www.jianshu.com/p/54b0c3eb79a8

new：申请空间new 的类型 一定要和赋值匹配上如结构体：#include &lt;iostream&gt;using namespace std;int main(){ int *p1 = new int; *p1 = 22; cout &lt;&lt; *p1 &lt;&lt; endl; delete p1; system("pause")...