[問題] 再問 *(取值) 與 copy assign的效率呢!?
看板C_and_CPP (C/C++)作者asail0712 (emeth)時間16年前 (2009/12/18 21:37)推噓8(8推 0噓 20→)留言28則, 9人參與討論串1/2 (看更多)
A *a = *iter;
if(a)
{
a->...
}
或是
if(*iter)
{
(*iter)->....
}
先取值 記錄起來再運算
跟直接取值 哪個有效率
假設 是上面這種 一個是取值一次 copy一次
一種是 取值兩次
哪種比較有效率
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12/18 21:44, , 1F
12/18 21:44, 1F
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12/18 21:44, , 2F
12/18 21:44, 2F
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12/18 21:46, , 3F
12/18 21:46, 3F
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12/18 21:50, , 4F
12/18 21:50, 4F
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12/18 22:01, , 5F
12/18 22:01, 5F
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12/18 22:02, , 6F
12/18 22:02, 6F
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12/18 22:29, , 7F
12/18 22:29, 7F
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12/18 22:30, , 8F
12/18 22:30, 8F
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12/18 22:31, , 9F
12/18 22:31, 9F
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12/18 22:32, , 10F
12/18 22:32, 10F
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12/18 22:32, , 11F
12/18 22:32, 11F
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12/18 22:48, , 12F
12/18 22:48, 12F
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12/18 22:49, , 13F
12/18 22:49, 13F
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12/18 22:55, , 14F
12/18 22:55, 14F
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12/18 22:55, , 15F
12/18 22:55, 15F
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12/18 23:12, , 16F
12/18 23:12, 16F
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12/18 23:13, , 17F
12/18 23:13, 17F
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12/18 23:13, , 18F
12/18 23:13, 18F
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12/18 23:23, , 19F
12/18 23:23, 19F
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12/18 23:23, , 20F
12/18 23:23, 20F
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12/18 23:28, , 21F
12/18 23:28, 21F
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12/18 23:43, , 22F
12/18 23:43, 22F
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12/18 23:44, , 23F
12/18 23:44, 23F
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12/18 23:45, , 24F
12/18 23:45, 24F
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12/18 23:49, , 25F
12/18 23:49, 25F
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12/18 23:56, , 26F
12/18 23:56, 26F
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12/19 02:33, , 27F
12/19 02:33, 27F
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12/19 09:38, , 28F
12/19 09:38, 28F
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