什么是“ operator int”？功能？ [英] What is an "operator int" function?

问题描述

下面的 operator int函数是什么？

What is the "operator int" function below? What does it do?

class INT
{
   int a;

public:
   INT(int ix = 0)
   {
      a = ix;
   }

   /* Starting here: */
   operator int()
   {
      return a;
   }
   /* End */

   INT operator ++(int)
   {
      return a++;
   }
};

推荐答案

粗体代码是转换运算符。 （又名广播运营商）

The bolded code is a conversion operator. (AKA cast operator)

它为您提供了一种方法，可以将您的自定义 INT 类型转换为另一种类型（在这种情况下， int ），而不必显式调用特殊的转换函数。

It gives you a way to convert from your custom INT type to another type (in this case, int) without having to call a special conversion function explicitly.

例如，使用convert运算符，此代码将编译：

For example, with the convert operator, this code will compile:

INT i(1234);
int i_2 = i; // this will implicitly call INT::operator int()

如果没有convert运算符，则上面的代码将无法编译，您必须做其他事情才能将 INT 转换为 int ：

Without the convert operator, the above code won't compile, and you would have to do something else to go from an INT to an int, such as:

INT i(1234);
int i_2 = i.a;  // this wont compile because a is private

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