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

std::map, C++, performance-sensitive, reserve capacity, STL, C++ optimization
Learn how to efficiently manage memory with `std::map` in C++ by reserving capacity to improve performance in critical sections of your code.
#include #include // Custom allocator for std::map (just an example, not actual code) template class CustomAllocator { // Implementation of custom allocator for performance }; int main() { // Create a std::map with a custom allocator std::map, CustomAllocator> myMap; // Since std::map doesn't provide direct capacity reservation, // consider initializing it with a reserve-like strategy. // For instance, if you know you will insert n elements, you can pre-allocate them. const int n = 100; for (int i = 0; i < n; ++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; }

std::map C++ performance-sensitive reserve capacity STL C++ optimization

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