By default, the name of the casting function is the same as the name of the structured type (in this case, Engineer_t and Salesperson_t, respectively).
默认情况下，casting函数的名称和结构化类型的名称相同(在这里，这两个名称分别是Engineer_t和Salesperson_t)。
By default, the name of the casting function is the same as the name of the structured type (in this case, Engineer_t and Salesperson_t, respectively).
默认情况下，casting函数的名称和结构化类型的名称相同(在这里，这两个名称分别是Engineer_t和Salesperson_t)。
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