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explicit's Issues

Consult: alternative approach to out_param.

Hi,
I'd like to be able to refactor existing code to add out_param semantics, preferably only modifying the signatures and call-sites, having out_param<T> behaving as original plain reference. Can this be accomplished by deriving from T?
e.g.

template<typename T>
struct out_param : public T
{
    using T::operator=;
    out_param()                            = delete;
    out_param& operator=(const out_param&) = delete;
    out_param& operator=(out_param&&)      = delete;
    out_param(const out_param&)            = delete;
    out_param(out_param&&)                 = delete;
};

template<typename T>
out_param<T>& out(T& t)
{
    static_assert(sizeof(T) ==  sizeof(out_param<T>)
              && alignof(T) == alignof(out_param<T>), "");

    assert(&static_cast<out_param<T>&>(t) == &t);

    return static_cast<out_param<T>&>(t); // is this UB?
}

///////////////////////////////////////////////////////

static void foo(out_param<string>& s)
{
    // use s as plain string&
}

static void bar()
{
    string s = "bar";
    const string const_s = "bar";
#if 0
    // should not compile
    foo(s);
    foo(const_s);
    foo(out(const_s));
    foo(out(std::move(s));
    foo("");
#endif

    foo(out(s));
}

Thanks!

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