Using Enums instead of Hardcoded value - c++

Question

I have some code that detects which tab is selected in a QListWidget
int currentTab=ui->tabWidget->currentIndex();
if (currentTab==0)
{
// Code here
}
else if (currentTab==1)
{
// Code here
}
else if (currentTab==2)
{
// code here
}
else if (currentTab==3)
{
// code here
}
How do i use Enums instead of if(currentTab==0) or if(currentTab==1) or if(currentTab==2) or if(currentTab==3)

Answer 1

I would handle the same in the following way (with using an enum type):
enum Tabs {
Tab1,
Tab2,
Tab3
};
void foo()
{
int currentTab = ui->tabWidget->currentIndex();
switch (currentTab) {
case Tab1:
// Handle the case
break;
case Tab2:
// Handle the case
break;
case Tab3:
// Handle the case
break;
default:
// Handle all the rest cases.
break;
}
}

Answer 2

Example to use the Enums given below.
if you want to use same enum element in two enumerations, then you can use the enum classes (strongly typed enumerations) C++11.
#include <iostream>
#include <cstdint>
using namespace std;
//enumeration with type and size
enum class employee_tab : std::int8_t {
first=0 /*default*/, second, third, last /*last tab*/
};
enum class employee_test : std::int16_t {
first=10 /*start value*/, second, third, last /*last tab*/
};
enum class employee_name : char {
first='F', middle='M', last='L'
};
int main(int argc, char** argv) {
//int currentTab=ui->tabWidget->currentIndex();
employee_tab currentTab = (employee_tab)1;
switch (currentTab) {
case employee_tab::first: //element with same name
cout << "First tab Selected" << endl;
break;
case employee_tab::second:
cout << "Second tab Selected" << endl;
break;
case employee_tab::third:
cout << "Third tab Selected" << endl;
break;
case employee_tab::last: //element with same name
cout << "Fourth tab Selected" << endl;
break;
}
employee_name currentName = (employee_name)'F';
switch (currentName) {
case employee_name::first: //element with same name
cout << "First Name Selected" << endl;
break;
case employee_name::middle:
cout << "Middle Name Selected" << endl;
break;
case employee_name::last: //element with same name
cout << "Last Name Selected" << endl;
break;
}
return 0;
}
output:
Second tab Selected
First Name Selected