How can I convert this C# foreach code to C++? - c++

Question

I am making tic tac toe game on the visual studio window form with c++.
How can I convert this C# code to C++ code?
private Void disableButtons()
{
try
{
foreach (Control c in Controls)
{
Button b = (Button)c;
b.Enabled = false;
}
}
catch{ }
}

Answer 1

You cannot convert it into pure C++ code without using any additional libraries that have classes Control and Button with Button class having an "Enabled" public member.
You can however convert it to C++/CLI code where you can mix pure C++ code too.
private Void disableButtons()
{
try
{
for each (Control^ c in Controls)
{
Button^ b = (Button^)c;
b->Enabled = false;
}
}
catch{ }
}

Answer 2

Here is an example on how to use the foreach of C# in c++:
#include <iostream>
int main()
{
const int SIZE = 3;
int myArray[SIZE] = { 1, 2, 3 };
for (int & i : myArray) // make sure to put the &
{
i = i + 10;
}
for (int i = 0; i < SIZE; i++)
{
std::cout << myArray[i] << std::endl;
}
return 0;
}
The syntax should be like this:
for(type name : collection) { // your code here }
and you can put & between type and name if you want to change the original elements
for(type & name : collection) { // your code here }

Answer 3

You've tagged this Visual C++ so I'm presuming you're using MFC. The answer would be different if you're using Qt or wxWidgets or something else.
If you already have the control ID's in a container that you want to for-each on, then:
UINT Controls[] = { IDC_BUTTON1, IDC_BUTTON2, IDC_BUTTON3, IDC_BUTTON4, IDC_BUTTON5 };
for (UINT c : Controls)
{
CWnd *b = GetDlgItem(c);
if (b)
b->EnableWindow(FALSE);
}
If however you don't have such a container of controls but somehow want to still iterate all the controls then:
CWnd *c = GetWindow(GW_CHILD);
while (c)
{
c->EnableWindow(FALSE);
c = c->GetNextWindow(GW_HWNDNEXT);
}
I recommend the first option because then you can be specific about which controls you want to modify. The second option will be tricky if you only want buttons.