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What is the best way to use a HashMap in C++?
...al hash values for first,
// second and third and combine them using XOR
// and bit shifting:
return ((hash<string>()(k.first)
^ (hash<string>()(k.second) << 1)) >> 1)
^ (hash<int>()(k.third) << 1);
}
};
}
...
创业 比“直男癌”更可怕的是“技术癌” - 资讯 - 清泛网 - 专注C/C++及内核技术
...光环，会失去对整个事情的全景认知和实事求是的判断，从而误入歧途。
举个例子，2006年的时候我看到过一个项目：当时频频爆出食品安全事故(现在似乎也没有好多少)，有人就结合当时方兴未艾的RFID技术做了一整套的生猪养...
Require either of two arguments using argparse
...er I realized it actually solves both conditions proposed in the question (XOR, basically). My initial concern was that yours only solved only one of the two conditions.
– ijoseph
Apr 13 '18 at 17:28
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max value of integer
...tter now, thanks! Too much Python, I suppose. I avoid ^ since it's usually xor
– Kos
Feb 21 '13 at 15:01
5
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maximum value of int
...which is now set to maximum positive value.
We could also use a mask and xor but then we had to know the exact bitsize of the variable. With shifting in bits front, we don't have to know at any time how many bits the int has on machine or compiler nor need we include extra libraries.
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WakeLock 扩展：保持设备唤醒扩展，防止系统休眠和电池优化 · App Inventor 2 中文网
...2 Companion 以添加额外权限。
电池优化
从 Android 6.0 (Marshmallow) 开始，系统引入了 Doze 模式来优化电池寿命。如果没有任何应用被主动使用，该功能会逐渐关闭所有功能（显示、CPU、WiFi 等）。WakeLock 功能也被部...
Why does C++ rand() seem to generate only numbers of the same order of magnitude?
...ut you should fix your answer using pow instead of ^ (which is the logical xor operator, not power, in C language).
– kriss
Jun 20 '13 at 14:20
6
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Operator Overloading with C# Extension Methods
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@SparK ^ is the xor operator in C#
– Jacob Krall
May 31 '16 at 21:26
1
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how to use #ifdef with an OR condition?
...ex condition.
Further-
AND: #if defined LINUX && defined ANDROID
XOR: #if defined LINUX ^ defined ANDROID
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普通码农和CTO之间的差距，就是这7点了 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...机会看到这个标题的文章不妨看一下评论。各种“喷子”从“性能”、“道德”、“微软很坏”、“PHP是最好的”等各种无厘头开喷。这似乎是程序员们的通病，对于一个自己没有好感的东西（比如：国产或者微软，这两个最容...