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What is the performance cost of having a virtual method in a C++ class?
...predicted. This can cause a large pipeline bubble as the processor cannot fetch any instructions until the indirect jump (the call through the function pointer) has retired and a new instruction pointer computed. So, the cost of a virtual function call is much bigger than it might seem from looking ...
How to write log to file
...
Was like $ cd /etc/systemd/system $ sudo vi app.service ExecStart=/bin/bash -c 'sudo go run main.go >> /home/ubuntu/go/src/html_menu_1/logfile' Me NOT work Ubuntu 18.04.3
– Ryosuke Hujisawa
Feb 2...
glob exclude pattern
..."eph"), files)
or replacing the lambda with an appropriate regex search, etc...
EDIT: I just realized that if you're using full paths the startswith won't work, so you'd need a regex
In [10]: a
Out[10]: ['/some/path/foo', 'some/path/bar', 'some/path/eph_thing']
In [11]: filter(lambda x: not re...
Check to see if python script is running
...ns up its pidfile under any circumstances (when killed, exceptions raised, etc.).
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Best way to parse command-line parameters? [closed]
... // all options that are applicable to builder (like description, default, etc)
// are applicable here as well
val count:ScallopOption[Int] = opt[Int]("count", descr = "count the trees", required = true)
.map(1+) // also here work all standard Option methods -
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Using mixins vs components for code reuse in Facebook React
...t to share behavior that uses React's lifecycle methods (componentDidMount etc). This problem is solved by the Higher-Order Components that Dan Abramov talk in his link (or by using ES6 class inheritance).
Mixins are also often used in frameworks, to make framework API available to all the componen...
Continuous Integration for Ruby on Rails? [closed]
... displaying links to them: you get no graphs of tests run, no trend lines, etc. I also had to adjust the routes.rb file to get the code linking working (the resources :projects line needs to move below all the other non-default routes).
TeamCity
This looks awesome, but the pay scale seems out of w...
How to check if two arrays are equal with JavaScript? [duplicate]
...to extend to DataViews. Should also be able to extend to RegExps probably, etc.
As you extend it, you realize you do lots of unnecessary comparisons. This is where the type function that I defined way earlier (solution #2) can come in handy; then you can dispatch instantly. Whether that is worth th...
MySQL query to get column names?
...lumn type, whether the column is nullable, max column size, character set, etc)...
Oh, and it's standard SQL (Whereas SHOW ... is a MySQL specific extension)...
For more information about the difference between SHOW... and using the INFORMATION_SCHEMA tables, check out the MySQL Documentation on I...
How do I write unit tests in PHP? [closed]
...ble. In case you need help to set it up, feel free to ask (but provide OS, etc.).
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