How the code works?

Question

I've found a code that looks like this...

void PrintValue(int value)
{
cout << "Value = " << value << endl;
}

void ForEach(const vector<int>& array, void (*func)(int))
{
for(int value : array)
func(value);
}

int main()
{
vector<int> someArray = {5,2,4,3,1};
ForEach(someArray, PrintValue);
}

Why function PrintValue can be assign on parameter like a variable? does it still a function or it was converted or something like that?

And what i didn't understood is for(int value : array). I've never seen loop like this and how it works?

Answer 1

The second argument in the ForEach function is a function pointer. It allows you to pass a function as a parameter

And that loop is called a foreach loop. I hope you can now look these up and learn some more things about these C++ features. They're powerful and very useful for advanced coding

Answer 2

Thanks Zeke Williams