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【多选题】
下列对类类型转换描述正确的是:A.
自定义的类类型A需要转换成其他类型，必须要在A的定义中添加一个类型转换的成员函数。
B.
类型转换的成员函数定义时，在形式上没有返回类型的描述，所以其函数实现不需要使用return带回返回值。
C.
由于类型转换的成员函数定义时没有参数，所以该转换函数就没有重载形式，就是不能为类型定义两个相同的转换描述。比如在complex中写两个double型的转换函数是不可能的。
D.
可以为自定义类型A定义多个类型转换函数来实现A个类型的转换。
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