類的函數聲明中「 const」最後的含義？ - Meaning of 'const' last in a function declaration of a class?

問題：

What is the meaning of const in declarations like these? 像這樣的聲明中const的含義是什麼？ The const confuses me. const使我感到困惑。

class foobar
{
  public:
     operator int () const;
     const char* foo() const;
};

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解決方案：

參考一： https://stackoom.com/question/39Xt/類的函數聲明中-const-最後的含義
參考二： https://oldbug.net/q/39Xt/Meaning-of-const-last-in-a-function-declaration-of-a-class