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Call Go functions from C
...out any unnecessary bits. It should make things a little clearer.
package foo
// extern int goCallbackHandler(int, int);
//
// static int doAdd(int a, int b) {
// return goCallbackHandler(a, b);
// }
import "C"
//export goCallbackHandler
func goCallbackHandler(a, b C.int) C.int {
return a...
How can I pretty-print JSON in a shell script?
...
With Python 2.6+ you can just do:
echo '{"foo": "lorem", "bar": "ipsum"}' | python -m json.tool
or, if the JSON is in a file, you can do:
python -m json.tool my_json.json
if the JSON is from an internet source such as an API, you can use
curl http://my_url/ | p...
How to remove last n characters from every element in the R vector
...of what I would do. I hope it's what you're looking for.
char_array = c("foo_bar","bar_foo","apple","beer")
a = data.frame("data"=char_array,"data2"=1:4)
a$data = substr(a$data,1,nchar(a$data)-3)
a should now contain:
data data2
1 foo_ 1
2 bar_ 2
3 ap 3
4 b 4
...
How to match, but not capture, part of a regex?
...----------------------------------------------------------------------
|(?=foo) | Lookahead | Asserts that what immediately FOLLOWS the |
| | | current position in the string is foo |
-------------------------------------------------------------------------
|(?<...
Rails extending ActiveRecord::Base
...
extend ActiveSupport::Concern
# add your instance methods here
def foo
"foo"
end
# add your static(class) methods here
class_methods do
#E.g: Order.top_ten
def top_ten
limit(10)
end
end
end
# include the extension
ActiveRecord::Base.send(:include, Ac...
Virtual member call in a constructor
...id DoSomething()
{
}
}
class Child : Parent
{
private string foo;
public Child()
{
foo = "HELLO";
}
protected override void DoSomething()
{
Console.WriteLine(foo.ToLower()); //NullReferenceException!?!
}
}
The answer is that in fact a Null...
How to achieve function overloading in C?
... that function.
So to implement your original example, we could do this:
foo_int (int a)
foo_char (char b)
foo_float_int (float c , int d)
#define foo(_1, ...) _Generic((_1), \
int: foo_int, \
...
How to move a file?
...the same syntax:
import os
import shutil
os.rename("path/to/current/file.foo", "path/to/new/destination/for/file.foo")
shutil.move("path/to/current/file.foo", "path/to/new/destination/for/file.foo")
os.replace("path/to/current/file.foo", "path/to/new/destination/for/file.foo")
Note that you must...
Uses for Optional
.... Accepting an Optional as the second arg would result in code like this:
foo("bar", Optional.of("baz"));
foo("bar", Optional.empty());
Even accepting null is nicer:
foo("bar", "baz");
foo("bar", null);
Probably the best is to have an overloaded method that accepts a single string argument and...
How do I ignore files in a directory in Git?
...cription, but it would only find a match with a directory. In other words, foo/ will match a directory foo and paths underneath it, but will not match a regular file or a symbolic link foo (this is consistent with the way how pathspec works in general in git).
If the pattern does not contain a slash...