C++ call deconstructor explicitly

//Util.h
#ifndef Util_H
#define Util_H

#include <chrono>
#include <ctime>
#include <fstream>
#include <functional>
#include <iostream>
#include <thread>
#include <unistd.h>
#include <uuid/uuid.h>

using namespace std;

class Util
{
public:
    Util();
    ~Util();
    static char *uuidValue;
    static char *dtValue;
    static int InitNum;
    char *getTimeNow();
    char *getUuid();
    void swap(int *left, int *right);
    void threadLE(int x,int y,int z,string str);
    void threadLE2(int x,int y,int z,string str);
};
#endif

//Util.cpp
#include "Model/Util.h"

char *Util::uuidValue = (char *)malloc(40);
char *Util::dtValue = (char *)malloc(20);
int Util::InitNum = 0;

Util::Util()
{
    cout << "Constructor num=" << ++InitNum << endl;
}

Util::~Util()
{
    cout << "Deconstructor and num=" << InitNum << endl;
    if (NULL != Util::dtValue)
    {
        free(Util::dtValue);
        Util::dtValue = NULL;
    }
    if (NULL != Util::uuidValue)
    {
        free(Util::uuidValue);
        Util::uuidValue = NULL;
    }
}

char *Util::getTimeNow()
{
    time_t rawTime = time(NULL);
    struct tm tmInfo = *localtime(&rawTime);
    strftime(dtValue, 20, "%Y%m%d%H%M%S", &tmInfo);
    return dtValue;
}

char *Util::getUuid()
{
    uuid_t newUUID;
    uuid_generate(newUUID);
    uuid_unparse(newUUID, uuidValue);
    return uuidValue;
}

void Util::threadLE(int x, int y, int z, string str)
{
    thread t1([](int xx, int yy, int zz, string sstr)
              {
        Util ul;
        for(int i=0;i<xx;i++)
        {
            cout<<"Num="<<i<<",uuid="<<ul.getUuid()<<endl;
        }

        for(int i=0;i<yy;i++)
        {
            cout<<"Uuid="<<ul.getUuid()<<",Num="<<i<<endl;
        }

        for(int i=0;i<zz;i++)
        {
            cout<<"Num="<<i<<endl;
        }

        cout<<"The string is "<<endl<<sstr<<endl; },
              x, y, z, str);
    t1.join();
    cout << getTimeNow() << ",finished in threadLE!" << endl;
}

void Util::threadLE2(int x, int y, int z, string str)
{
    thread t1([](int xx, int yy, int zz, string sstr)
              {
        Util ul;
        for(int i=0;i<xx;i++)
        {
            cout<<"Num="<<i<<",Uuid="<<ul.getUuid()<<endl;
        }

        for(int i=0;i<yy;i++)
        {
            cout<<"Uuid="<<ul.getUuid()<<",Num="<<i<<endl;
        }

        for(int i=0;i<zz;i++)
        {
            cout<<"Num="<<i<<endl;
        }

        cout<<"The string is "<<endl<<sstr<<endl;
        ul.~Util();
         },x, y, z, str);

    t1.join();
    cout << getTimeNow() << ",finished in void Util::threadLE2(int x,int y,int z,string str)!!" << endl;
}

//main.cpp
#include "Model/Util.h"

void threadLE1(int x, int y, int z, string str);
void threadLE2(int x,int y,int z,string str);

int main(int agrs, char **argv)
{
    try
    {
       threadLE2(atoi(argv[1]),atoi(argv[2]),atoi(argv[3]),argv[4]);
    }
    catch(const std::exception& e)
    {
        std::cerr << e.what() << '\n';
    } 
}

void threadLE2(int x,int y,int z,string str)
{
    Util ul;
    ul.threadLE2(x,y,z,str);
}

void threadLE1(int x, int y, int z, string str)
{
    Util ul;
    ul.threadLE(x,y,z,str);
}

To invoke the deconstructor explicitly,you just need obj.~Deconstructor() as below in line 90

 

 

 

ul.~Util();

The executed result as below.