How do I avoid rehashing overhead with std::vector for embedded targets?

When working with embedded systems, memory management and performance are critical considerations. One common approach for storing collections of elements is to use `std::vector`. However, in scenarios where you anticipate frequent additions to the vector, rehashing can introduce significant overhead. Understanding how to minimize this overhead can lead to optimized performance on resource-constrained devices.

To avoid rehashing overhead with `std::vector`, it's crucial to reserve enough space upfront. This way, the vector does not need to grow dynamically as new elements are added, which would trigger reallocation and copying of elements.

Here is a simple example demonstrating how to use the `reserve` function effectively:

#include <vector> int main() { // Create a vector and reserve space for 100 elements std::vector myVector; myVector.reserve(100); // Now we can add elements without worrying about rehashing costs for (int i = 0; i < 100; ++i) { myVector.push_back(i); } // The vector can now be used efficiently return 0; }

Embedded systems C++ std::vector performance optimization memory management rehashing reserve function dynamic memory

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