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Thursday, 3 July 2008

Copy constructor and copy assignment test C++

#include <iostream>
#include <list>
#include <pthread.h>

/*
 * test copy constructors and copy assignment
 * g++ -Wall copyctor.cc -o copyctor
 * ./copyctor
 * valgrind -v --leak-check=full --show-reachable=yes ./copyctor
 */


using namespace std;

class CopyCtor {
    private:
        pthread_mutex_t pMutex;
        int * passed_in;
        int * created_1;
        int * created_2;
        list<int> functions;
   
   
    public:
        CopyCtor();
        CopyCtor(int * passedin);
        CopyCtor(const CopyCtor &cc);                     // copy constructor
        CopyCtor& operator=(const CopyCtor &cc); // copy assignment
        ~CopyCtor();
}; 
   
CopyCtor::CopyCtor(): passed_in(NULL), created_1(NULL), created_2(NULL) {}
   
// Ctor
CopyCtor::CopyCtor(int * passedin): passed_in(passedin) {
   
    pthread_mutex_init(&pMutex, NULL);
    created_1 = new int(1);
    created_2 = new int(2);
    cout << "CopyCtor::ctor: passed_in " << *passed_in << "," << passed_in << ", created_1: " << *created_1
         << "," << created_1 << ", created_2: " << *created_2 << "," << created_2 <<  endl;
}  
   
   
// copy constructor
CopyCtor::CopyCtor(const CopyCtor & cc) {
    // want to get a new lock
    pthread_mutex_init(&pMutex, NULL);
    pthread_mutex_lock(&pMutex);
    //if (passed_in)
    //    delete(passed_in);
    passed_in = cc.passed_in;
    /*if (created_1)
        delete created_1;
    if (created_2)
        delete created_2;*/
    created_1 = new int(*cc.created_1);
    created_2 = new int(*cc.created_2);
    cout << "CopyCtor::copy ctor: passed_in " << *passed_in << "," << passed_in << ", created_1: " << *created_1
         << "," << created_1 << ", created_2: " << *created_2 << "," << created_2 <<  endl;
    pthread_mutex_unlock(&pMutex);
}

// copy assignment operator
CopyCtor & CopyCtor::operator=(const CopyCtor& cc)
{
    if (this != &cc) {
        // want to get a new lock
        pthread_mutex_init(&pMutex, NULL);
        pthread_mutex_lock(&pMutex);
        //if (passed_in)
        //    delete(passed_in);
        passed_in = cc.passed_in;
        if (created_1)
            delete created_1;
        if (created_2)
            delete created_2;
        created_1 = new int(*cc.created_1);
        created_2 = new int(*cc.created_2);
        cout << "CopyCtor::operator=: passed_in " << *passed_in << "," << passed_in << ", created_1: " << *created_1
             << "," << created_1 << ", created_2: " << *created_2 << "," << created_2 <<  endl;
        pthread_mutex_unlock(&pMutex);
    } else {
        pthread_mutex_lock(&pMutex);
        cout << "CopyCtor::operator=: this == &cc: passed_in " << *passed_in << "," << passed_in
             << ", created_1: " << *created_1
             << "," << created_1 << ", created_2: " << *created_2 << "," << created_2 <<  endl;
        pthread_mutex_unlock(&pMutex);
    }
    return *this;
}

CopyCtor::~CopyCtor()
{
    cout << "~CopyCtor" << endl;
    delete created_1;
    delete created_2;
}

int main()
{
    int first = -1;
    int second = -2;
    CopyCtor *cc = new CopyCtor(&first);
    CopyCtor *cd = new CopyCtor(&second);
    *cd = *cc;
    CopyCtor *ce;
    ce = new CopyCtor(*cd);
    CopyCtor cf = *ce;
    cf = cf;
    delete(ce);
    delete(cc);
    delete(cd);
}

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