Cassidoo's number of ones in C++ for some reason

NumberOfOnes.cpp

#include <iostream>

int numberOfOnes(int val)
{
    int count = 0;
    // only one digit
    auto numberOfOnesCount = [&count](auto& self, int subval)->void {
        if (subval < 10) {
            if (subval == 1) {
                count++;
            }
        }
        else {
            int base10Val = subval / 10;
            int base1Val = subval % 10;
            if (base1Val == 1) {
                count++;
            }
            self(self, base10Val);
        }
    };

    for (int i = 1; i <= val; i++) {
        numberOfOnesCount(numberOfOnesCount, i);
    }

    return count;
}

int main()
{
    std::cout << numberOfOnes(14); // 7
    std::cout << "\n";

    std::cout << numberOfOnes(5); // 1
    std::cout << "\n";

    std::cout << numberOfOnes(56); // 16
    std::cout << "\n";

    std::cout << numberOfOnes(152); // 89
    std::cout << "\n";
}