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Bash empty array expansion with `set -u`
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$ bash --version | head -n 1
GNU bash, version 4.4.19(1)-release (x86_64-pc-linux-gnu)
$ set -u
$ arr=()
$ echo "foo: '${arr[@]}'"
foo: ''
There is a conditional you can use inline to achieve what you want in older versions: Use ${arr[@]+"${arr[@]}"} instead of "${arr[@]}".
$ function args...
App Inventor 2 列表积木完全指南：从入门到精通，一篇搞定数据存储 - App...
...t;张三" 25 true ]复制代码
这里依次存放了字符串（姓名）、数字（年龄）、布尔值（是否会员），取出来时保持原类型不变。
3. 追加列表项
使用 追加列表项 积木，将新元素添加到列表末尾。同样是块扩展积木，点击...
Does the default constructor initialize built-in types?
... // Uses value-initialization feature instead
assert(c.x == 0);
C *pc = new C(); // Does not use default constructor for `C()` part
// Uses value-initialization feature instead
assert(pc->x == 0);
The behavior of () initializer is different in some respects between C++9...
Convert UTC/GMT time to local time
...ing a C# application for a web-service client. This will run on Windows XP PC's.
11 Answers
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Why should I use core.autocrlf=true in Git?
...this scenario) are converted to CRLF line endings on checkout to a Windows PC. All files are converted back to LF line endings on commit from a Windows PC. The way to get in trouble is to checkout initially to a Windows PC with the wrong core.autocrlf setting (which is entirely too easy to do).
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What does a type followed by _t (underscore-t) represent?
...tforms -- so whose int are you conforming to? (Although, these days, most PC-centric development treats it as 32 bits, much stuff for non-PC development still treat int's as 16 bits).
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imp...
常用Git命令汇总 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
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--local #单独一个项目
git config --global user.name "xxxx" #用户名
git config --global user.email "xxxx@xxx.com" #邮箱
git config --global core.editor vim #编辑器
git config --global alias.st status #按这种方法，配置别名
git config -l #列举所有配置
Git中3种...
【HarmonyOS】编译、测试全流程 - HarmonyOS NEXT - 清泛IT社区，为创新赋能！
一、HarmonyOS NEXT 应用签名体系概述
HarmonyOS NEXT 对应用安全有严格的要求，任何 HAP（HarmonyOS Ability Package）包都必须经过签名才能安装到真机。
1.1 签名类型
签名类型能否安装能否上架应用市场设备限制证书来源适用场景未...
lua和c/c++互相调用实例分析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...onst char *k);
当"栈"中包含执行脚本需要的所有要素(函数名和参数)后，调用lua_pcall执行脚本：
int (lua_pcall) (lua_State *L, int nargs, int nresults, int errfunc);
下面进行实例说明：
func.lua
--变量定义
width=1 ;
height=2 ;
--lua函数定义，...
Which version of C# am I using
...bly.ImageRuntimeVersion does not tell you the right version number - on my PC, .NET 4.6 RC is installed but Assembly.ImageRuntimeVersion reports v4.0.30319
– Matt
Jul 14 '15 at 10:55
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