You innocently ask
std::vector<bool> to store another boolean value. Simple request, right? Just one more bit of data. But instead of being a normal, well-behaved container like every other vector type, it decides to go full chaos mode and implement a space-optimized bit-packing scheme that breaks half the STL conventions.
Fun fact: std::vector<bool> doesn't actually store individual bools—it packs them into bits to save memory. Sounds great until you realize it returns proxy objects instead of references, making it not a proper STL container. It's basically the C++ committee's greatest regret, right up there with auto_ptr.
That eel's expression? That's your code when you try to take the address of an element and everything implodes. Should've used std::deque<bool> or std::vector<char> instead.
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