我是男孩提交作业 #39
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我是男孩提交作业 #39
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Mq-b
approved these changes
Apr 17, 2024
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| # 作业 | ||
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| #### 分析 |
| } | ||
| ``` | ||
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| *简述代码使用的折叠表达式的语法、效果、详细解析。* |
| (tmp = ... = (res.push_back(args), false)); | ||
| ``` | ||
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| 代码中存在`= ... =`，符合`运算符 ... 运算符`形势，即为二元折叠。又因`...`在“形参包（args）”左边，折叠表达式为一个二元左折叠。 |
| (((tmp = (res.push_back(3.5), false)) = (res.push_back(1), false)) = (res.push_back(2), false)); | ||
| ``` | ||
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| 赋值表达式从右向左，所以从后向前push到res。逗号表达式返回右边的false，tmp为flase（没什么用）。 |
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也别说没啥用，你就说和之前形参包的展开中的数组 int _ [] 那玩意一样，是为了：“创造语境，符合语法”
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好的国王，以后注意 |
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