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I believe this was already covered in your other question (#q294951), but this:

while(ros :: ok)

is not correct.

It should be: ros::ok(). It's a function, not a variable.

What you have now probably checks a function pointer, which will evaluate to true, hence making your while-loop equivalent to while (true).

I believe this was already covered in your other question (#q294951), but this:

while(ros :: ok)

is not correct.

It should be: ros::ok(). It's a function, not a variable.

What you have now probably checks a function pointer, which will evaluate to true, hence making your while-loop equivalent to while (true).