How do I find elements with custom comparators with std::deque in multithreaded code?

When working with std::deque in a multithreaded environment in C++, you may want to find elements using custom comparators. The std::deque provides a dynamic array that can grow and shrink in size, making it useful in multithreading scenarios where you need thread-safe access to elements. However, when multiple threads access the deque simultaneously, special care must be taken to avoid data races.

Here's a quick example of how you can achieve this. We will use a custom comparator to search for elements in a std::deque. In a real-world application, you should ensure proper synchronization using mutexes to avoid concurrent access issues.


#include 
#include 
#include 
#include 
#include 

std::mutex mtx;

struct CustomComparator {
    bool operator() (const int& a, const int& b) const {
        return a < b; // Define your custom comparison logic here
    }
};

bool findInDeque(std::deque& d, int value, std::mutex& mtx) {
    std::lock_guard<:mutex> lock(mtx);
    return std::find_if(d.begin(), d.end(), [&value](int elem) {
        return elem == value;
    }) != d.end();
}

void searchInDeque(std::deque& d, int value) {
    if (findInDeque(d, value, mtx)) {
        std::cout << value << " found in the deque." << std::endl;
    } else {
        std::cout << value << " not found in the deque." << std::endl;
    }
}

int main() {
    std::deque d = {1, 2, 3, 4, 5};

    std::thread t1(searchInDeque, std::ref(d), 3);
    std::thread t2(searchInDeque, std::ref(d), 6);

    t1.join();
    t2.join();

    return 0;
}

C++ std::deque custom comparator multithreading find elements thread-safe synchronization mutex data races algorithms

How do I find elements with custom comparators with std::deque in multithreaded code?

Popular Topics

Recent Languages

How do I find elements with custom comparators with std::deque in multithreaded code?

Related Questions

Popular Topics

Recent Languages