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如何初始化标志性变量的空元组?
我正在尝试这样做:
concat_obj(AllStr, Str, AllStr)
AllStr 没有初始化,所以它抛出一个异常..
对象需要首先使用gen_empty_obj(str) 代码如下所示,
gen_empty_obj(str)
gen_empty_obj(str) gen_empty_obj(AllStr) str := iconic_object_1 AllStr := iconic_object_2 concat_obj(AllStr, str, AllStr)