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Magic number in boost::hash_combine
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Take a look at the DDJ article by Bob Jenkins from 1997. The magic constant ("golden ratio") is explained as follows:
The golden ratio really is an arbitrary value. Its purpose is to avoid mapping all zeros to all zeros.
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What version of Visual Studio is Python on my computer compiled with?
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Where does this table come from?
– Glyph
Aug 20 '12 at 0:30
5
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Resize image to full width and fixed height with Picasso
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how to resize it without cropping it from any side and also maintaining the aspect
– Rohit Sharma
Nov 22 '18 at 10:54
add a comment
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test a file upload using rspec - rails
...ybara?
It's easy to test file uploads using capybara's attach_file method from a request spec.
For example (this code is a demo only):
it "can upload a license" do
visit upload_license_path
attach_file "uploadLicense", /path/to/file/to/upload
click_button "Upload License"
end
it "can downl...
Uninstall old versions of Ruby gems
...gems/ruby-2.1.1@project/cache/nokogiri-1.6.6.2.gem
the, you can remove it from cache:
rm /home/rails/.rvm/gems/ruby-2.1.1@project/cache/nokogiri-1.6.6.2.gem
For more detail:
http://blog.grepruby.com/2015/04/way-to-clean-up-gem-or-remove-old.html
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How to get the current date without the time?
...e expressive date/time API which allows you to talk about dates separately from times, you might want to look at the Noda Time project which I started. It's not ready for production just yet, but we'd love to hear what you'd like to do with it...
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Uri to default sound notification?
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Settings comes from import android.provider.Settings;
– Chris Knight
Oct 10 '13 at 22:16
add a comment
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How do I test for an empty JavaScript object?
...e lodash is empty (lodash.com/docs#isEmpty), but how is that any different from using a jQuery solution - you still need to install an additional library. I think a vanilla javascript solution is the intent.
– tfmontague
Jul 23 '14 at 23:38
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.NET List Concat vs AddRange
... content of an existing list use AddRange.
If you are creating a new list from two IEnumerable sources then use Concat with .ToList. This has the quality that it does not mutate either of sources.
If you only ever need to enumerate the contents of two Lists (or any other IEnumerable) then simply ...
Adding a background image to a element
...olor url('path')"></div>
Where:
color is color in hex or one from X11 Colors
path is path to the image
others like position, attachament
background CSS Property is a connection of all background-xxx propieties in that syntax:
background:
background-color
background-image
backgr...