How do I find elements with custom comparators with std::vector in performance-sensitive code?

In performance-sensitive C++ code, you may need to find elements in a std::vector using custom comparators efficiently. The traditional methods like std::find will not utilize your custom logic, so you might use std::find_if along with a user-defined comparator or a custom function object. Here’s an example demonstrating how to achieve this:

#include #include #include struct CustomComparator { bool operator()(int a, int b) const { return a < b; // Custom comparison logic } }; int main() { std::vector numbers = {10, 20, 5, 30, 15}; int target = 5; // Using std::find_if with a custom comparator auto it = std::find_if(numbers.begin(), numbers.end(), [target](int num) { return num == target; // Custom condition }); if (it != numbers.end()) { std::cout << "Found: " << *it << std::endl; } else { std::cout << "Not found" << std::endl; } return 0; }

C++ std::vector custom comparators performance-sensitive std::find_if

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