C++中const引用对象的条件赋值

Question

这是一个说明我的问题的代码片段：

class A {...};
const A& foo1() {...}
const A& foo2() {...}

void foo3(int score) {
  if (score > 5)
    const A &reward = foo1();
  else 
    const A &reward = foo2();

  ...

  // The 'reward' object is undefined here as it's scope ends within the respective if and else blocks.

}

如何在 if else 块之后访问reward对象foo3()？这是避免代码重复所必需的。

提前致谢 ！

Answer 1

您可以使用三元运算符：https : //en.wikipedia.org/wiki/%3F%3A

const A &reward = (score > 5) ? foo1() : foo2();