No matching overloaded function found

For the code snippet below, I keep getting the invoke error C6272. I have tried multiple things - passing using ref, without it and even testing as a simple thread. For context, the member function is a function that multiplies two sparse matrices and adds them to a linked list. Without using threads, the function works fine but threads returns an error.

mutex m;
vector<thread> a;
for (int q = 0; q < rhs.num_columns_; q  ) { 
    a.push_back(thread(&SparseMatrix::mul_node, rhs_rows, lhs_rows, q, ref(newMatrix), ref(m)));
}
for (thread& t : a) {
    t.join();
}

Declaration of the mul_node function

void SparseMatrix::mul_node(vector<vector<int>> rhs, vector<vector<int>> lhs, int pos_rhs, row_node* &newMatrix, mutex &m) const`

I have not been able to find a solution yet for the problem above, please let me know what exactly is causing the issue and how I can fix it? Thank you

CodePudding user response：

Since the member function is not static you need to pass a pointer to the instance of the SparseMatrix on to the std::thread constructor too.

Simplified example:

#include <iostream>
#include <thread>

struct foo {
    ~foo() {
        if(th.joinable()) th.join();
    }

    void run() {
        th = std::thread(&foo::thread_func, this, 10, 20);
        //                                  ^^^^
    }

    void thread_func(int a, int b) {
        std::cout << "doing the stuff " << a << ' ' << b << '\n';
    }

    std::thread th;
};

int main() {
    foo f;
    f.run();
}

Here 10 and 20 are passed as parameters to this->thread_func.