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What's the simplest way to test whether a number is a power of 2 in C++?
...he numbers is 0 0 0 0 = 0.
Time complexity : O(1).
Approach #3:
Bitwise XOR the number with its just previous number should be sum of both numbers.
Example: Number = 8
Binary of 8: 1 0 0 0
Binary of 7: 0 1 1 1 and the bitwise XOR of both the numbers is 1 1 1 1 = 15.
Time complexity : O(1).
htt...
CMake使用教程 - C/C++ - 清泛网 - 专注C/C++及内核技术
...roj项目。
通过编写CMakeLists.txt，可以控制生成的Makefile，从而控制编译过程。CMake自动生成的Makefile不仅可以通过make命令构建项目生成目标文件，还支持安装（make install）、测试安装的程序是否能正确执行（make test，或者ctest）...
boost多索引容器multi_index_container实战 - C/C++ - 清泛网 - 专注C/C++及内核技术
...iner,Tag>::type& i = get<Tag>(s);这段代码定义了一个容器索引，从容器s中提取出Tag标签作为索引的序列i（对于有序的容器也可以说是用Tag排序的序列），接下来是typedef typename MultiIndexContainer::value_type value_type;语句定义了容器的元素类...
Logic to test that 3 of 4 are True
...
Not sure it is simpler, but maybe.
((x xor y) and (a and b)) or ((x and y) and (a xor b))
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20个命令行工具监控 Linux 系统性能 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...包括 Apache、MYSQL、Mail、FTP、Nginx 等等。系统状态是可以从命令行或者自己的网络接口来查看。
12. NetHogs — 监视每个进程的网络带宽
NetHogs 是一个开源的漂亮的小程序（类似于 Linux 上面的 top 命令），在您的系统上保持每个进...
MFC子窗口和父窗口（SetParent,SetOwner） - C/C++ - 清泛网 - 专注C/C++及内核技术
...则该窗口就成为这个新的弹出式窗口的owner，否则，系统从hWndParent的父窗口向上找，直到找到第一个非子窗口，把它作为该弹出窗口的owner。当owner窗口销毁的时候，系统自动销毁这个弹出窗口。
Pop-up类型的窗口也属于顶级窗口...
Easiest way to flip a boolean value?
...han longVariableName = !longVariableName; And every programmer should know XOR.
– xamid
Oct 5 '17 at 16:15
3
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Ora-00257 错误处理一列 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...
2014_11_05/
2014_11_06/
2014_11_07/
2014_11_10/
然后开始删除从最早的开始删除
检查一些无用的archivelog
RMAN> crosscheck archivelog all;
删除过期的归档
RMAN> delete expired archivelog all;
注：删除过期的归档
这样就把归档文件删除了...
What is the fastest way to compare two sets in Java?
...like that? Well if the set hashcode was:
zero for an empty set, and
the XOR of all of the element hashcodes for a non-empty set,
then you could cheaply update the set's cached hashcode each time you added or removed an element. In both cases, you simply XOR the element's hashcode with the curr...
Best practices for overriding isEqual: and hash
...
A simple XOR over the hash values of critical properties is sufficient
99% of the time.
For example:
- (NSUInteger)hash
{
return [self.name hash] ^ [self.data hash];
}
Solution found at http://nshipster.com/equality/ by Mat...