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C++ Lock-free Hazard Pointer(冒险指针) - C/C++ - 清泛网 - 专注C/C++及内核技术
C++ Lock-free Hazard Pointer(冒险指针)hazard_pointer1 Safe Reclamation MethodsFolly 的 Hazard Pointer 实现中有一段注释,详细描述了 C++ 里几种主流的安全内存回收方法,列表如下:优点缺点场景Locking易用读高开销
1. Safe Reclamation Methods
Fo...
How to extract img src, title and alt from html using php? [duplicate]
... that case it's better to split the process into two parts :
get all the img tag
extract their metadata
I will assume your doc is not xHTML strict so you can't use an XML parser. E.G. with this web page source code :
/* preg_match_all match the regexp in all the $html string and output everythi...
How can one display images side by side in a GitHub README.md?
...side by side if the images are not too wide.
<p float="left">
<img src="/img1.png" width="100" />
<img src="/img2.png" width="100" />
<img src="/img3.png" width="100" />
</p>
share
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C++对象布局及多态探索之菱形结构虚继承 - C/C++ - 清泛网 - 专注C/C++及内核技术
...|m1 |
(注:为了不折行,我用了缩写。ospt代表偏移值指针、m代表成员变量、vtpt代表虚表指针。第一个数字是该区域的大小,即字节数。只有偏移值指针有第二个数字,第二个数字就是偏移值指针指向的偏移值的大小。)
...
How to close tag properly?
...
<img src='stackoverflow.png' />
Works fine and closes the tag properly. Best to add the alt attribute for people that are visually impaired.
shar...
C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术
C语言结构体里的成员数组和指针单看这文章的标题,你可能会觉得好像没什么意思。你先别下这个结论,相信这篇文章会对你理解C语言有帮助。这篇文章产生的背景是在微博上,...单看这文章的标题,你可能会觉得好像没什么...
Convert SVG to image (JPEG, PNG, etc.) in the browser
... calls to output a png
var canvas = document.getElementById("canvas");
var img = canvas.toDataURL("image/png");
// do what you want with the base64, write to screen, post to server, etc...
});
share
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Convert RGBA PNG to RGB with PIL
...95/…). I had to convert the PNG to RGBA first and then slice it: alpha = img.split()[-1] then use that on the background mask.
– joehand
Nov 2 '12 at 0:56
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总结const_cast、static_cast、dynamic_cast、reinterpret_cast - C/C++ - ...
...C类型转换类似,不检查类型来保证转换安全。也可用于指针的父类到子类的...简单总结:
1) const_cast:移除const属性。
2) static_cast:强转,与C类型转换类似,不检查类型来保证转换安全。也可用于父子类指针的向上转换。
3) dy...
C语言结构体里的成员数组和指针 - c++1y / stl - 清泛IT社区,为创新赋能!
...为什么不是 13行if语句出错?f.a被初始化为空了嘛,用空指针访问成员变量为什么不crash?2)为什么会访问到了0x4的地址?靠,4是怎么出来的?3)代码中的第4行,char s[0] 是个什么东西?零长度的数组?为什么要这样玩?让我们...
