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What is the difference between packaged_task and async
...rono::seconds(1));
return 1;
};
Packaged task
A packaged_task won't start on it's own, you have to invoke it:
std::packaged_task<int()> task(sleep);
auto f = task.get_future();
task(); // invoke the function
// You have to wait until task returns. Since task calls sleep
// you will h...
Debugging with command-line parameters in Visual Studio
... solution, remember to right click the project you wand to run and "Set as StartUp Project".
– Lion Lai
Apr 17 '17 at 7:51
1
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How to execute a Ruby script in Terminal?
...
Just call: ruby your_program.rb
or
start your program with #!/usr/bin/env ruby,
make your file executable by running chmod +x your_program.rb
and do ./your_program.rb some_param
share...
Should I always use a parallel stream when possible?
... i have a collection of objects that implement Runnable that I call start() to use them as Threads, is it ok to change that to using java 8 streams in a .forEach() parallelized ? Then i'd be able to strip the thread code out of the class. But are there any downsides?
– y...
How can I format a nullable DateTime with ToString()?
...mat)
=> dt == null ? "n/a" : ((DateTime)dt).ToString(format);
And starting in C# 6, you can use the null-conditional operator to simplify the code even more. The expression below will return null if the DateTime? is null.
dt2?.ToString("yyyy-MM-dd hh:mm:ss")
...
Apache2: 'AH01630: client denied by server configuration'
...rom all
2.4 configuration:
Require all granted
Also don't forget to restart the apache server after these changes (# service httpd restart)
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Python - write() versus writelines() and concatenated strings
...e character '\n' as glue. It is more efficient than using the + operator.
Starting from the same lines sequence, ending up with the same output, but using writelines():
lines = ['line1', 'line2']
with open('filename.txt', 'w') as f:
f.writelines("%s\n" % l for l in lines)
This makes use of a...
android layout: This tag and its children can be replaced by one and a compound drawable
... the TextView doesn't set properly.
You need to set its gravity to center|start to achieve what shown in the asked question.
The textview looks like this:
<TextView
android:id="@+id/export_text"
android:layout_width="match_parent"
android:layout_height="match_parent"...
How do I manually create a file with a . (dot) prefix in Windows? For example, .htaccess
...
If you start Notepad and then File -> Save As -> Write .htaccess and choose "All Files" as the type - then it will create the .htaccess file for you.
...
What is the meaning of single and double underscore before an object name?
...al use" indicator. E.g. from M import * does not import objects whose name starts with an underscore.
Double Underscore (Name Mangling)
From the Python docs:
Any identifier of the form __spam (at least two leading underscores, at most one trailing underscore) is textually replaced with _class...