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                盡管函數轉換成成員函數的過程是機械式的,但還是有一些古怪的地方。例如,after函數對兩個Time對象進行操作,而不僅僅是一個,我們不能使它倆都成為隱式的。而需要在其中一個對象上調用這個函數,并把另一個對象作為參數傳遞給它。 在函數中,我們隱式地引用其中一個對象,而繼續使用點符號來訪問另一對象的實例變量。 ~~~ bool Time::after (const Time& time2) const{ if(hour > time2.hour) return true; if(hour < time2.hour) return false; f(minute > time2.minute) return true; if(minute < time2.minute) return false; if(second > time2.second) return true; return false; } ~~~ 調用此函數: ~~~ if (doneTime.after (currentTime)) { cout << "The bread will be done after it starts." <<endl; } ~~~ 調用過程可以這么理解: “如果done-time在current-time之后,那么...”
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