原文

de class="prism language-cpp">d">import dule">std.stdio;
d">class A
{string xxx(d">const Object) d">const { d">return "A"; }
}
d">class B : A
{alias xxx = A.xxx;string xxx(Object) { d">return "B"; }
}
d">void main()
{d">const A a = d">new A();B b = d">new B();d">const B c = d">new B();writeln(a.xxx(a));writeln(b.xxx(b));writeln(c.xxx(c));
}
de>

我调用此de>xxxde>而不是de>toStringde>,这样可de>显示de>所有代码.de>编译de>并运行它打印:

de class="prism language-cpp">A
B
A
de>

即,可以有个可变的de>toString()de>,且可很好地与de>writeln()de>一起使用,因为de>writeln(x)de>不查找de>Object.toString()de>,而是查找de>x.toString()de>.