#include <iostream>
class Foo
{
    int result;
 
public:
    Foo() : result(0) {}
    Foo(bool value) : result(value ? 1 : 0) {}
    explicit Foo(int value) : result(value) {}
    Foo operator+(bool value) const
    {
        std::cout << "adding " << value << std::endl;
        return Foo((result << 1) | (value ? 1 : 0));
    }
    int get_result() const { return result; }
};
 
int main()
{
    Foo x;
    x = Foo(true) + false + true;
    std::cout << x.get_result() << std::endl;
}

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