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GLib compile error (ffi.h), but libffi is installed
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If you have a Debian-based Linux OS with apt-get:
sudo apt-get install libffi-dev
With a Redhat-base OS:
yum install libffi-devel
With Alpine Linux:
apk add libffi-dev
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Could not load NIB in bundle
... (use a storyboard):
For some reason it changed from "Main storyboard file base name" to "Main nib file base name" in the plist.
Changing back to "Main storyboard file base name" (UIMainStoryboardFile) solved the issue
shar...
What are good uses for Python3's “Function Annotations”
...uses for annotations beyond assurance. I can see how I could apply my Java-based tools to Python. For instance, I have a tool that lets you assign special warnings to methods, and gives you indications when you call them that you should read their documentation (E.g., imagine you have a method that ...
Tool to Unminify / Decompress JavaScript [closed]
...ne only formats the code, it doesn't change variable names, nor uncompress base62 encoding.
edit: in fact it can unpack "packed" scripts (packed with Dean Edward's packer : http://dean.edwards.name/packer/)
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Why can't I inherit static classes?
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Other opinions from channel9
Inheritance in .NET works only on instance base. Static methods are defined on the type level not on the instance level. That is why overriding doesn't work with static methods/properties/events...
Static methods are only held once in memory. There is no virtual table...
Extracting the last n characters from a string in R
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I'm not aware of anything in base R, but it's straight-forward to make a function to do this using substr and nchar:
x <- "some text in a string"
substrRight <- function(x, n){
substr(x, nchar(x)-n+1, nchar(x))
}
substrRight(x, 6)
[1] "string"...
Run a callback only if an attribute has changed in Rails
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Rails 5.1+
class Page < ActiveRecord::Base
before_save :do_something, if: :will_save_change_to_status_id?
private
def do_something
# ...
end
end
The commit that changed ActiveRecord::Dirty is here: https://github.com/rails/rails/commit/16ae3db5a5c...
How to print out the contents of a vector?
...re complicated objects where this solution is not going to be ideal.
range-based for loop (C++11)
See Jefffrey's solution. In C++11 (and later) you can use the new range-based for loop, which looks like this:
for (auto i: path)
std::cout << i << ' ';
Since path is a vector of items (e...
Can modules have properties the same way that objects can?
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Based on this, I added another answer: stackoverflow.com/a/58526852/2124834
– user2124834
Oct 23 '19 at 15:59
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How can I find and run the keytool
...C:\cygwin\bin\openssl.exe" sha1 -binary | "C:\cygwin\bin\openssl.exe"
> base64
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