Question

I need to check if std:array was initialized (or some default common value).
The array is optional , so i need to check if it has value or not.
I dont use boost.
i tried this:

array<unsigned char, 2> testArr;
testArr.fill(0);
if(testArr.empty()){
    cout << "testArr is empty" <<endl ;
}

i am lookin for a simple way to init to default value and check if default value without iterate (by myself) , is there something?

Answer 1

There are no ways to do this without optional or something else, since std::array::empty()

Checks if the container has no elements, i.e. whether begin() == end().

So, checks, that there is no elements in container (i.e. std::array<T, 0>) and nothing else. You should use any optional class, or iterate over array and check values. If you don’t want use boost::optional – write your own optional like boost::optional. It’s very simple.