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Is git's semi-secret empty tree object reliable, and why is there not a symbolic name for it?
... empty tree value is formally defined in cache.h.
#define EMPTY_TREE_SHA1_HEX \
"4b825dc642cb6eb9a060e54bf8d69288fbee4904"
Since Git 2.16 (Q1 2018), it is used in a structure which is no longer tied to (only) SHA1, as seen in commit eb0ccfd:
Switch empty tree and blob lookups to use hash...
Is either GET or POST more secure than the other?
...?o??`o"FyVOByY_ Supo? /'i?Oi"4
tr'9/o_7too7q?c2Pv
(note: I converted the HEX to ASCII, some of it should obviously not be displayable)
The entire HTTP conversation is encrypted, the only visible portion of communication is on the TCP/IP layer (meaning the IP address and connection port informatio...
VC窗口刷新InvalidateRect和UpdateWindow - C/C++ - 清泛网 - 专注C/C++及内核技术
...需要能够主动引发窗口中的绘制操作，比如当窗口显示的数据改变的时候，这一般是通过InvalidateRect和 InvalidateRgn函数来完成的。InvalidateRect和InvalidateRgn把指定的区域加到窗口的Update Region中，当应用的消息队列没有其他消息时，...
How to develop a soft keyboard for Android? [closed]
...true; // Consume touch event
}
});
// Disable spell check (hex strings look like words to Android)
edittext.setInputType(edittext.getInputType()
| InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
}
}
// NOTE How can we change the background color of some keys (like the
// ...
2015互联网结束补贴战 从相杀到相爱只需一个长假 - 资讯 - 清泛网 - 专注C/...
...到的一个段子，“2015年化缘的改叫众筹了，统计改叫大数据分析了，做耳机的改为可穿戴设备了，IDC的都自称云计算了，办公室出租改叫孵化器了，借钱给朋友改叫天使投资了，放高利贷都改叫资本运作了。”虽然段子有些调...
马化腾给创业者的3点建议：行业跨界领域最有机会诞生创新 - 资讯 - 清泛网 ...
...，除了智能控制，电子以外，还有很多新材料，计算机大数据，甚至医药，生物科技，还有材料学等等领域，有很多国际人才和成果，能不能把这种模式再推广继续扩大呢？其实很有机会，但是过去没有太过关注这一点。沈南鹏...
滚动控制使用指导 · App Inventor 2 中文网
...由属性或方法启动。设计器展示样式不等于运行时已加载数据或绑定目标。联机测试应使用包含本组件的 AI 伴侣；涉及系统入口或权限的行为还要编译安装后验证。
案例：返回顶部
放垂直滚动条布局，加入...
Your build failed due to an error in the AAPT stage · App Inventor 2 中文网
...全保存在目标设备上。尝试保存到您的 PC，然后通过 USB 数据线将其移动到设备（”adb”安装）
APK 名称包含非打印字符：如果将该名称复制并粘贴到 App Inventor 中，其中可能包含回车符或制表符之类的字符
APK 文件已损坏。这...
'printf' vs. 'cout' in C++
... noise).
printf("0x%04x\n", 0x424);
std::cout << "0x" << std::hex << std::setfill('0') << std::setw(4) << 0x424 << std::endl;
Translation
This is where the real advantage of printf lies. The printf format string is well... a string. That makes it really easy t...
How to convert a number to string and vice versa in C++
...1.2 + 3 = 4.2"
You can use stream manipulators, such as std::endl, std::hex and functions std::setw(), std::setprecision() etc. with string streams in exactly the same manner as with cout
Do not confuse std::ostringstream with std::ostrstream. The latter is deprecated
Use boost lexical cast. If ...