Pr oblems Accessing Certain Class Functions C++ from Vector

Question

I have a vector of type Tab, but when I call class functions on the vector of Tabs I get no output. However, I don't receive any errors either.

If you know what an Android launcher is, then this is supposed to be a simple console-based testcase of an Android launcher with categorized tabs that allow you to scroll to another tab.

main.cpp

#include <iostream>
#include <vector>
#include <string>
#include "Tab.h"

void addVectOfTabs(std::vector<Tab>& tabs);
void swipe(std::vector<Tab>& tabs);
int main()
{
    std::vector<Tab> tabs;
    tabs.reserve(3);
    addVectOfTabs(tabs);
    swipe(tabs);
    return 0;
}

void addVectOfTabs(std::vector<Tab>& tabs)//adds values to the vector(arrayList) of tabs
{
    Tab google  ("Google", "0001", "#ffffff");
    Tab xPosed  ("XPosed", "0002", "#aaaaaa");
    Tab custom  ("Custom", "0003", "#dddddd");
    tabs.push_back(google);//don't have to use new keyword for whatever reason (C++ is weird)
    tabs.push_back(xPosed);
    tabs.push_back(custom);//just some bs values for these
    std::cout<<google.getTabColor(); //this works
}

void swipe(std::vector<Tab>& tabs)//automated simulated swiping
{
    for(int i=0;i<tabs.size();i++)
    {
        int tabSize = tabs[i].getAppsInDrawerSize();
        tabs[i].showName();
        std::cout << "\n\n\n" << "**********************" << tabs[i].getTabID() << "*************";
        std::cout << "\n" << tabSize;
        for(int j=0;j < tabSize;j++)
        {
            std::cout<<"\nYou are at app " << (j+1) << " of " << tabSize;
        }
        if (i>tabSize)//I wrote this code late last night and have no clue what I was thinking with this ine
            i++;
    }
}

Tab.h

#ifndef TAB_H
#define TAB_H
#include <vector>
#include <string>
#include <array>


class Tab
{
    public:
        Tab();
        virtual ~Tab();
        Tab(const Tab& other);
        Tab(std::string tabName, std::string tabID, std::string tabColor);
        std::array<int,10>& getAppsInDrawer();
        std::string getTabName();
        std::string& getTabID();
        std::string& getTabColor();
        int getAppsInDrawerSize();
        void showName(); //can't access
    protected:

    private:
        std::array<int, 10> appsInDrawer; //vector is like arraylist in Java; simulation of apps in the app drawer
        void populateAppsInDrawer();
        std::string tabName;
        std::string tabID;
        std::string tabColor;
};

#endif // TAB_H

Tab.cpp

#include <string>
#include <iostream>
#include "Tab.h"


Tab::Tab()
{
    //ctor
}

Tab::~Tab()
{
    //dtor
}

Tab::Tab(const Tab& other)
{
    //copy ctor
}

Tab::Tab(std::string tabN, std::string tabId, std::string tabClor): tabName(tabN), tabID(tabId), tabColor(tabClor)
{

}

std::array<int,10>& Tab::getAppsInDrawer()
{
    return appsInDrawer;
}

std::string Tab::getTabName()
{
    return tabName;
}

std::string& Tab::getTabID()
{
    return tabID;
}

std::string& Tab::getTabColor()
{
    return tabColor;
}

void Tab::populateAppsInDrawer()//for simulation purposes
{
    for(int i=0;i<10;i++)
    {
        appsInDrawer[i]=i+1;//adds an item; similar to arrayList.add()
    }
}

int Tab::getAppsInDrawerSize()
{
    return appsInDrawer.size();
}

void Tab::showName()
{
    std::cout << tabName;
}

I know in my code I return some addresses and some strings, but that was just to test to see if one method would work over the other, but it doesn't.

Answer 1

Just adding to my comment above. The problem is that your Tab class has declared a copy constructor but has nothing in the body of the contructor, so this is why when you place your objects in the vector, they appear to do nothing. If you have access to a c++11 compatible compiler, you can do:

#include <utility>
...
tabs.push_back(std::move(google));

In the tabs class, add this constructor:

explicit Tab(Tab &&other) = default;

This is more efficient than copying because it will take the object you currently have and place it into the vector rather than copying it thus creating 2 copies of the same object

Ex: http://rextester.com/MNB8052