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g++ undefined reference to typeinfo
...no-rtti and -frtti code. Then you need to ensure that any class, which type_info is accessed in the -frtti code, have their key method compiled with -frtti. Such access can happen when you create an object of the class, use dynamic_cast etc.
[source]
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App Inventor 2 百度网盘拓展：授权、文件列表、下载、上传 · App Inventor 2 中文网
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使用前准备
使用示例
1. 用户授权，拿到 access_token
2. 列出目录文件
3. 下载选中的文件
4. 上传文件
5. 处理错误
属性
事件
方法
常见问题
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更新日志
v1.0
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App Inventor 2 Canvas绘图教程 - 游戏精灵与动画实现 · App Inventor 2 中文网
...随画布的 PaintColor 属性，不是 DrawText 的参数：
when 按钮_红字.Click() {
画布1.PaintColor = "&HFFFF0000"
画布1.DrawText("红色的字", 50, 50)
}
ImageSprite（图片精灵）
ImageSprite是Canvas上的可移动图片对象，是实现游戏角色...
Find out whether Chrome console is open
...id
var checkStatus;
var element = document.createElement('any');
element.__defineGetter__('id', function() {
checkStatus = 'on';
});
setInterval(function() {
checkStatus = 'off';
console.log(element);
console.clear();
}, 1000);
Another version (from comments)
var element = new ...
How to convert a java.util.List to a Scala list
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import scala.collection.JavaConversions._
will do implicit conversion for you; e.g.:
var list = new java.util.ArrayList[Int](1,2,3)
list.foreach{println}
share
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Node: log in a file instead of the console
... change, you can't call stderr.pipe() anymore - it takes this now: process.__defineGetter__('stderr', function() { return fs.createWriteStream(__dirname + '/error.log', {flags:'a'}) })
– damianb
Feb 23 '13 at 17:35
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How can I join elements of an array in Bash?
...re Bash function that supports multi-character delimiters is:
function join_by { local d=$1; shift; local f=$1; shift; printf %s "$f" "${@/#/$d}"; }
For example,
join_by , a b c #a,b,c
join_by ' , ' a b c #a , b , c
join_by ')|(' a b c #a)|(b)|(c
join_by ' %s ' a b c #a %s b %s c
join_by $'\n' a b ...
Combining node.js and Python
... s = zerorpc.Server(HelloRPC())
s.bind("tcp://*:4242")
s.run()
if __name__ == "__main__" : main()
And the node.js client:
var zerorpc = require("zerorpc");
var client = new zerorpc.Client();
client.connect("tcp://127.0.0.1:4242");
//calls the method on the python object
client.invoke("h...
How to know if an object has an attribute in Python
...Exists"
The disadvantage here is that attribute errors in the properties __get__ code are also caught.
Otherwise, do-
if hasattr(someObject, 'someProp'):
#Access someProp/ set someProp
pass
Docs:http://docs.python.org/library/functions.html
Warning:
The reason for my recommendation is ...
Bin size in Matplotlib (Histogram)
...width in this example could be found by: (data.max() - data.min()) / number_of_bins_you_want. The + binwidth could be changed to just 1 to make this a more easily understood example.
– Jarad
Jan 22 '18 at 17:31
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