How do I reserve capacity ahead of time with std::unordered_map for embedded targets?

When working with embedded targets where resources are limited, it's important to manage memory usage effectively. One way to achieve this is by reserving capacity ahead of time for an `std::unordered_map`. This can help avoid the overhead of reallocations as elements are added.

In C++, you can reserve capacity for an `std::unordered_map` using the `reserve` method. Here's how you can do it:

#include #include int main() { // Create an unordered_map std::unordered_map myMap; // Reserve capacity for 100 elements myMap.reserve(100); // Add some key-value pairs for (int i = 0; i < 100; ++i) { myMap[i] = "Value " + std::to_string(i); } // Output the contents of the map for (const auto &pair : myMap) { std::cout << pair.first << ": " << pair.second << std::endl; } return 0; }

C++ std::unordered_map reserve capacity embedded targets memory management

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