constexpr constructors

cc.cpp

#include <iostream>

class Debug {
public:
    constexpr Debug (bool a, bool b, bool c):
                    hw (a), io (b), other (c) { }

    constexpr Debug()  : Debug(false, false, false) { }
    constexpr Debug (bool aa) : Debug (false , false ,false) { }
    constexpr Debug (bool aaa, bool bb) : Debug (false, false, false) { }

    void set_io (bool);
    bool set_any ();
    void set_other (bool);
    void set_hw (bool);

private:
    bool hw, io, other;
};

void Debug::set_hw (bool bbbb) {
    this->hw = bbbb;
}

void Debug::set_io (bool b) {
    this->io = b;
}

bool Debug::set_any () {
    return hw || io || other;
}

void Debug::set_other (bool bbb) {
    this->other = bbb;
}

int main ()
{
    Debug test (true, true, true);

    if (test.set_any())
        std::cerr << "prints error (need debugging)" << std::endl;
    else
        std::cerr << "doesnt need debug" << std::endl;

    return 0;
}