Opposite of |= operation

[JPNaude]

Hi

This is probably a simple question, but I can't figure out how to do it. I have a bitwise enum. I know that you set one of the bits as follows (example taken out of a table model implementation:

if (is_editable)
     item_flags |= Qt::ItemIsEditable;
//else
//  item_flags (what to do here) Qt::ItemIsEditable;

if (is_editable)
     item_flags |= Qt::ItemIsEditable;
//else
//  item_flags (what to do here) Qt::ItemIsEditable;

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I've searched the web but couldn't find any solutions, or I missed them.
I looked at the QWidget::setAttribute() function implementation but it does quite a few things in there and I'm hoping there is a simpler way to do it.

Thanks for your time.
Jaco

[yogeshgokul]

Do nothing in else.

[JPNaude]

I agree but it will only work in the following scenario won't it:

item_flags = 0;
 
if (is_editable)
     item_flags |= Qt::ItemIsEditable;
//else
//  item_flags (what to do here) Qt::ItemIsEditable;

item_flags = 0;

if (is_editable)
     item_flags |= Qt::ItemIsEditable;
//else
//  item_flags (what to do here) Qt::ItemIsEditable;

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I need to be able to remove that flag is it was set, for example:

item_flags =  Qt::ItemIsEditable;
 
if (is_editable)
     item_flags |= Qt::ItemIsEditable;
//else
//  item_flags (what to do here) Qt::ItemIsEditable;

item_flags =  Qt::ItemIsEditable;

if (is_editable)
     item_flags |= Qt::ItemIsEditable;
//else
//  item_flags (what to do here) Qt::ItemIsEditable;

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Any ideas?
Thanks
Jaco

[squidge]

item_flags &= ~Qt::ItemIsEditable;

[yogeshgokul]

I need to be able to remove that flag is it was set, for example:

This is called bit masking.
To unset a flag (zero-out a bit or set a bit to zero) flags & ~flagbitN.
Enjoy

[JPNaude]

Brilliant! Thank you will give it a go.