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                最初版本的convertToSeconds函數是這樣的: ~~~ double convertToSeconds (const Time& time) { int minutes = time.hour * 60 + time.minute; double seconds = minutes * 60 + time.second; return seconds; } ~~~ 我們可以很直接的將其轉換為成員函數: ~~~ double Time::convertToSeconds () const { int minutes = hour * 60 + minutes; double seconds = minutes * 60 + second; return seconds; } ~~~ 有趣的是,因為我們在函數中沒有修改隱式參數,這里它應該被聲明為const。但是,與不存在的參數相關的信息應該寫在哪里并不是顯而易見的。答案是——如例子所示——將const放在參數列表之后(本例中為空)。 上節中的print函數同樣應該將其隱式參數聲明為const。
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