Some people say that C++ STL is slow. I would rather say it's the way we use it. Sure, there are many potential sources of slowness when using STL....
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Another fun way STL containers can be misused is not understanding the underlying memory management enough. Growing an
std::vectorby naively pushing elements and letting the container grow automatically is much, much slower than pre-allocating if you know the roughly how large your data set will be.That's right, I fully agree.