Question

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Can you remove elements from a std::list while iterating through it?

I have a loop in a function, that iterates over an std::list from begin to end.

In each cycle, I perform some checks and maybe do a few manipulations on the current list entry, and in some cases I want to remove it from the list.

Now, as expected my iterator gets invalidated.

• Is there any way to work around this, to remove elements from a list while iterating over it?

Answer 1

Use postfix increment.

list.erase(it++);

it is increased, so it no longer refers to the erased element, then the previous value of it is given to list.erase. Make sure that you either do list.erase(it++) or ++it in your loop – doing both will skip elements and potentially increment past end of the list.