How to track when all the elements of a vector <bools> are false?

[sheva29]

Note: I'm not using c++ 11 unfortunately so I don't have access to all_of().

I basically have a vector <bool> isHovered;

As the name instantiates, when an element in particular on the screen gets hovered, a boolean assigned to it turns on and the others remain false. Because is a mouse interaction, only one element would be true at the time.

One thought that I had was to create a counter that increases every time a boolean becomes true. The problem with this approach is that because I have my for loop in an update function it checks all the time. Therefore, the counter will increase more than once while I'm hovering.

Now the question here is: is there any way to know by looping through the vector when all of the elements are false:

something like:

vector<bool>::iterator c;
for ( c = isHovered.begin(); c != isHovered.end(); c++ ){
 
 if( all of the elements are false){

   //do something
 }

}

Thanks in advance

[keskiverto]

Do you mean something like http://www.cplusplus.com/reference/algorithm/find/

[sheva29]

This works beautifully, thanks so much. I came up with this:

vector<bool>::iterator d;
    
    d = find(isHovered.begin(), isHovered.end(), true);
    
    
    if ( d != isHovered.end()){
        
        cout << "One element is true" << *d << endl;
    }else{
        
        cout << "All of the elements are false" << endl;
    }

[dhayden]

If the size of the vector doesn't change after it's constructed then you could use bitset instead. bitset has an any() method that is probably much faster.
http://www.cplusplus.com/reference/bitset/bitset/any/

[sheva29]

@dhayden Thanks for you reply. Could you elaborate an example using bitset? I looked at the documentation reference, but I'm having a hard time trying to understand it. Thanks!

[dhayden]

std::bitset<200> bits;   // create a set of 100 bits.
...
if (!bits.any()) {
   // do something if all bits are false. Ths is what you want..
} else if (bits.all(){ 
   // do something if all bits are true
}

bits[3] = true
bits.set(3, false);
if (bits.test(19)) 
    cout << bit 19 is true.
}