[kaik]

I kid you not, I spent a full working day debugging this exact same issue (taking a pointer to a vector element, before adding more elements). Very obvious if you understand how C++ and vectors work, yet it took me forever to realize, and it was miserable…

[saagarjha]

Heh, you can run into this even if you understand how iterator invalidation works. Once you see the bug it's easy to understand, but finding it might not be…

[account42]

> finding it might not be…

Valgrind memcheck is your friend.

[gpderetta]

also asan.