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Why should I prefer to use member initialization lists?
...rators
variable = a;
}
};
Here compiler follows following steps to create an object of type MyClass
1. Type’s constructor is called first for “a”.
2. The assignment operator of “Type” is called inside body of MyClass() constructor to assign
variable = a;
And t...
内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...译。
glibc ptmalloc2
ptmalloc2即是我们当前使用的glibc malloc版本。
ptmalloc原理
系统调用接口
上图是 x86_64 下 Linux 进程的默认地址空间, 对 heap 的操作, 操作系统提供了brk()系统调用，设置了Heap的上边界； 对 mmap 映射区域的操作,...
网站伪静态Rewrite重写中文路径时乱码 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...管是Apache还是ISAPI_Rewrite，URL均识别的是UTF8编码的。
PS：字符编码转换过程： gbk、gb2312 >> uinicode >> utf8
第一，当在浏览器地址栏输入中文时（浏览器会自动转换）：
1) url路径：utf8 格式
2) url参数：gbk 格式
3) resquest.Q...
How to restart a rails server on Heroku?
...ias by adding it to your .bashrc or .bash_aliases file as described at:
https://askubuntu.com/questions/17536/how-do-i-create-a-permanent-bash-alias and
Creating permanent executable aliases
Then you can just type hra app_name
You can restart a specific remote, e.g. "staging" with:
heroku restart ...
Generating matplotlib graphs without a running X server [duplicate]
...ig('temp.png')
You don't have to use the Agg backend, as well. The pdf, ps, svg, agg, cairo, and gdk backends can all be used without an X-server. However, only the Agg backend will be built by default (I think?), so there's a good chance that the other backends may not be enabled on your partic...
Lost httpd.conf file located apache [closed]
...
Get the path of running Apache
$ ps -ef | grep apache
apache 12846 14590 0 Oct20 ? 00:00:00 /usr/sbin/apache2
Append -V argument to the path
$ /usr/sbin/apache2 -V | grep SERVER_CONFIG_FILE
-D SERVER_CONFIG_FILE="/etc/apache2/apache2.conf"
Re...
STL：accumulate与自定义数据类型 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
struct Student
{
string name;
int total;
};
class PS{
public:
int operator()(int t1,const Student& t2)
{
return (t1 + t2.total);
}
};
int main()
{
Student student[3]={
{"hicjiajia",10},
{...
MFC RoundRect、FillRect等函数如何设置颜色 - C/C++ - 清泛网 - 专注C/C++及内核技术
...Rect（FillSolidRect） 颜色：
CPen mypen, *oldpen;
mypen.CreatePen(PS_SOLID, 1, m_clrFrame);
oldpen = pDC->SelectObject(&mypen);
CPoint point(7, 7);
pDC->RoundRect(rectEdit, point);
pDC->SelectObject(oldpen);
CDC中FillRect与FillSolidRect的区别：
在网上找FillRect与F...
Linux 查看进程的可执行文件路径 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...roc下该pid目录下的内容，即可查看进程详细的路径信息：ps -elf | grep xxxls proc {pid} -lh找到进程的pid，然后查看/proc下该pid目录下的内容，即可查看进程详细的路径信息：
ps -elf | grep xxx
ls /proc/{pid} -lh
Linux下如何启动Tomcat像Windows显示控制台日志信息？ - 更多技术 - 清泛网...
...nux下直接启动. startup.sh但是查看不到启动日志信息，通过ps &ndas...Windows下启动tomcat，一般直接运行startup.bat，启动后如下图所示：
Linux下直接启动./startup.sh但是查看不到启动日志信息，通过ps –ef|grep tomcat查看，实际已经...