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lang-cpp
sizeof(std::vector<float>) - sizeof(std::vector<float>*)on either stack or heap ...std::vector<float>object to the heap (the OP's 2nd case), would require additionalsizeof(std::vector<float>)(eventually aligned) bytes from there, wouldn't it??std::vector<>object, there's no difference (as I also mentioned in my answer). But for thestd::vector<>object itself managed on heap or stack, there is (at leastsizeof(std::vector<float> - sizeof(std::vector<float*>)! It's a bit nitpicking, but might matter when calling a function recursively and using a stack allocated vector. For the overall memory consumption of a process there's no considerable difference at all.