In fact , during testing of the release of the cfront 1 . 0 language compiler from bell laboratories , there was a minor debate within a small circle of language lawyers as to whether or not a forward declaration and subsequent definition or any such combination had to consistently use the one or other keyword , or should they be allowed to be used interchangeably 實(shí)際上,在對(duì)貝爾實(shí)驗(yàn)室推出的cfront 1 . 0語(yǔ)言編譯器版本進(jìn)行測(cè)試的過(guò)程中,就前向聲明和隨后定義(或任何此類組合)是必須始終如一地使用一個(gè)或另一個(gè)關(guān)鍵字,還是應(yīng)當(dāng)允許交替使用它們,少數(shù)語(yǔ)法學(xué)家之間曾發(fā)生過(guò)一些爭(zhēng)論。