That can do almost anything (including reallocating), so you can’t really rely on it: “Requests the container to reduce its capacity to fit its size. “The req

That can do almost anything (including reallocating), so you can’t really rely on it: “Requests the container to reduce its capacity to fit its size. “The request is non-binding, and the container implementation is free to optimize otherwise and leave the vector with a capacity greater than its size. “This may cause a reallocation, but has no effect on the vector size and cannot alter its elements.”