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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);
}
};
}
...
从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
从源代码剖析Mahout推荐引擎前言Mahout框架中cf.taste包实现了推荐算法引擎，它提供了一套完整的推荐算法工具集，同时规范了数据结构，并标准化了程序开发过程。应用推...前言
Mahout框架中cf.taste包实现了推荐算法引擎，它提供...
Renaming the current file in Vim
...ngthy in any project. Is there a solution to this?
– xor
Sep 16 '15 at 13:06
1
That's great! I ke...
error C2664: “find_char”: 不能将参数 1 从“const char [14]”转换为“...
error C2664: “find_char”: 不能将参数 1 从“const char [14]”转换为“std::string &出错代码：#include <iostream>#include <string>using std::cout;using std::endl;using std::string; const引用形参举例 非const...出错代码：
#include <iostream>
#include <string>
using...
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
...
C++虚继承的概念 - C/C++ - 清泛网 - 专注C/C++及内核技术
C++虚继承的概念C++中虚拟继承的概念为了解决从不同途径继承来的同名的数据成员在内存中有不同的拷贝造成数据不一致问题，将共同基类设置为虚基类。这时从...C++中虚拟继承的概念
为了解决从不同途径继承来的同名的数据...
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
...
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.
...
app inventor屏幕属性中的文件范围分别是什么意思？ - App Inventor 2 中文...
...种类型的简述：App [推荐] ：Android 2.2及更高版本上文件将从应用程序特定存储中读取和写入，在 Android 早期版本上，文件将写入兼容存储中。
App的根目录为：/storage/emulated/0/Android/data。读写文件在指定的 files 目录下，如图：（...
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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