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Is it better in C++ to pass by value or pass by constant reference?
...ecially true before the existence of move semantics. The reason is simple: if you passed by value, a copy of the object had to be made and, except for very small objects, this is always more expensive than passing a reference.
With C++11, we have gained move semantics. In a nutshell, move semantics...
Git: fatal: Pathspec is in submodule
...worked for me:
git rm --cached directory
git add directory
This works if you purposefully removed the .git directory because you wanted to add directory to your main git project. In my specific case, I had git cloned an extension and ran git add . without thinking too much. Git decided to creat...
How to clear MemoryCache?
...ng MemoryCache.Default... MSDN's MemoryCache documentation makes me wonder if disposing and recreating is recommended: "Do not create MemoryCache instances unless it is required. If you create cache instances in client and Web applications, the MemoryCache instances should be created early in the ap...
App Inventor 2 Posenet人体姿态检测教程 · App Inventor 2 中文网
...")
var 结果 = ""
// 如果手腕在肩膀上方（Y值更小）
if 手腕Y < 肩膀Y {
var 结果 = "右手举起"
}
return 结果
}
判断站立/坐着
function 判断姿势(关键点列表) {
var 左臀 = 列表第12项(关键点列表)
var 右臀 =...
How do I convert a String object into a Hash object?
...ver, this requires the same to be true of all of the objects in the hash.
If I start with the hash {:a => Object.new}, then its string representation is "{:a=>#<Object:0x7f66b65cf4d0>}", and I can't use eval to turn it back into a hash because #<Object:0x7f66b65cf4d0> isn't valid ...
Play an audio file using jQuery when a button is clicked
...p() function we first pause the file then reset its time.
We may want to know the length of the audio file and the current playing time. We already learnt .currentTimeabove, to learn its length we use .duration.
Example Guide
When document is ready we created an audio element dynamically
We set ...
Where does Chrome store extensions?
... in the place where there are selected from in all Operating Systems.
Ex: If i load a unpacked Extension from E:\Chrome Extension the unpacked Extension is still in the same location
Storage Location for Packed Extensions
Navigate to chrome://version/ and look for Profile Path, it is your default...
How do I change the color of the text in a UIPickerView under iOS 7?
... using the view it passes in reusingView: how do I change it to use a different text color? If I use view.backgroundColor = [UIColor whiteColor]; none of the views show up anymore.
...
Xcode suddenly stopped running project on hardware: “Could not launch xxx.app: .. No such file..” [c
...code/DerivedData/-gbrvhlvwmpiobxdujegtghggrffp - or something like that)
Now start Xcode once again, connect device and run the project. It should work fine.
from DhilipSiva blog
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Best way to pretty print a hash
...
Sorry, I realize now that pretty_generate does accept a Ruby object, not json text.
– Tony
Aug 23 '17 at 23:52
add a ...