詞語：ifdef
ifdef的解釋
ifdefn. 如果定義了
ifdef的意思
ifdef 如果定義了;
ifdef的參考例句
1.Actually it is not guaranteed that the file will be safely imported (ResEdit does not really understand #ifdef for example). 實際上它是保證不的文件將會安全地被輸入。
2.Code for debug is written under conditional compilation, and the condition is such as the debug code is not embedded if the condition is not present (i. e. #ifdef DEBUG). 用於調試的代碼可以使用條件編譯來包含，這樣可以在調試的時候起作用，而發佈版本失效（不被編譯）。