This function sets the value of an instance (nonstatic) field of an object.

这个函数设置一个对象实例(非静态)域的值。

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This function returns the value of an instance (nonstatic) field of an object.

这个函数返回一个对象实例（非静态）域的值。

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Or, a nonstatic member function was called from outside the class as a static function.

或是，非静态的成员函式被当做静态函式从类别外呼叫。

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Or, a nonstatic member function was called from outside the class as a static function.

或是，非静态的成员函式被当做静态函式从类别外呼叫。

youdao