Qt5.7中報錯“xxx dose not name a type”的原因;
在Qt5.7中實現一個登陸框調轉到主介面過程中，出現了這樣的錯誤：“‘xxx’ dose not name a type”;報錯說xxx沒有宣告一種型別，但是在使用中明明已經有宣告。
在查詢了一些資料後才發現，原來是widget.h與dialog.h兩個檔案中，互相將對方包含了，由此造成了這樣的錯誤。我是將dialog作為widget的成員，故在dialog的檔案中均無需包含widget的標頭檔案。否則，便會報這種錯誤。
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