Type-erased ScopeGuard

If you search online for a ScopeGuard example, you may chance upon an implementation that uses std::function instead of a class template. The implementation itself is quite simple:

class ScopeGuard {
    public:
    template <typename Func> ScopeGuard(Func&& func) 
        : commit_(false), func_(func) {}
    template <typename Func> ScopeGuard(const Func& func) 
        : commit_(false), func_(func) {}
    ~ScopeGuard() { if (!commit_) func_(); }
    void commit() const noexcept { commit_ = true; }
    ScopeGuard(ScopeGuard&& other) 
        : commit_(other.commit_), 
          func_(other.func_) 
        { other.commit(); }
    private:
    mutable bool commit_;
    std::function<void()> func_;
    ScopeGuard& operator=(const ScopeGuard&) = delete;
};

Note that this ScopeGuard is a class, not a class template. It has template...