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从 svndata 恢复svn服务器仓库 - 更多技术 - 清泛网 - 专注C/C++及内核技术
从 svndata 恢复svn服务器仓库svndata_restore_svnserver服务器端备份了svndata，然后需要在一台新机器上还原svn仓库，步骤如下：1、确认新机器已经安装svnserverapt-get install subversion2、从svndata目录启动svn服务程序svnserve 服务器端备份了sv...
Possible to do a MySQL foreign key to one of two possible tables?
...oach with "CONSTRAINT CHECK". But it can be improved if we change "OR" to "XOR". That way we insure that only one column from set is NOT NULL
– alex_b
Aug 19 '15 at 14:18
1
...
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);
}
};
}
...
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...
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...
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
...
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...
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
...
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...
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.
...