How do I reserve capacity ahead of time with std::deque in performance-sensitive code?

In performance-sensitive C++ code, utilizing `std::deque` can lead to significant performance improvements by reserving capacity ahead of time. Unlike `std::vector`, `std::deque` does not have a `reserve` method, but you can optimize performance by pre-pushing elements in a way that minimizes reallocations and copying. Below is an example showing how to efficiently use `std::deque`.

#include #include int main() { std::deque myDeque; // Simulating reserved capacity by pre-inserting elements for (int i = 0; i < 100; ++i) { myDeque.push_back(i); } // Display the elements for (const auto& elem : myDeque) { std::cout << elem << " "; } std::cout << std::endl; return 0; }

C++ std::deque performance optimization reserve capacity pre-insertion

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