需要先解引用指针.

A *ptr = new A();
(*ptr) << "Something";

唯一的另一种方式是你上面描述的方式

The only other way is the way you described above

下面安德烈的解决方案也是可行的，但正如他所说，这可能不是一个好主意.

Andre's solution below is workable as well, but like he said it may not be a good idea.