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How to pass macro definition from “make” command line arguments (-D) to C source code?
...
Just use a specific variable for that.
$ cat Makefile
all:
echo foo | gcc $(USER_DEFINES) -E -xc -
$ make USER_DEFINES="-Dfoo=one"
echo foo | gcc -Dfoo=one -E -xc -
...
one
$ make USER_DEFINES="-Dfoo=bar"
echo foo | gcc -Dfoo=bar -E -xc -
...
bar
$ make
echo foo | gcc -E -xc -
.....
How to run code when a class is subclassed? [duplicate]
...Classes (by default) are instances of type.
Just as an instance of a class Foo is created by foo = Foo(...),
an instance of type (i.e. a class) is created by myclass = type(name, bases, clsdict).
If you want something special to happen at the moment of class-creation, then you have to modify the th...
Capturing multiple line output into a Bash variable
...actical purposes this is way easier to deal with.
./myscript.sh > /tmp/foo
while read line ; do
echo 'whatever you want to do with $line'
done < /tmp/foo
Quick hack to make it do the requested action:
result=""
./myscript.sh > /tmp/foo
while read line ; do
result="$result$line\n"...
How do I convert a dictionary to a JSON String in C#?
...tring[] args)
{
Dictionary<int, List<int>> foo = new Dictionary<int, List<int>>();
foo.Add(1, new List<int>( new int[] { 1, 2, 3, 4 }));
foo.Add(2, new List<int>(new int[] { 2, 3, 4, 1 }));
foo.Add(3, new Li...
How to pipe list of files returned by find command to cat to view all the files
...do what you are wanting to do -- but is specific to find)
find . -name '*.foo' -exec cat {} \;
(Everything between find and -exec are the find predicates you were already using. {} will substitute the particular file you found into the command (cat {} in this case); the \; is to end the -exec co...
Restful way for deleting a bunch of items
...about what we mean with our URL, parameters and REST method.
return all 'foo' elements:
[GET] api/foo
return 'foo' elements with filtering for specific ids:
[GET] api/foo?ids=3,5,9
Wherein the sense is the URL and the filter determine "what elements we are dealing with?", and the REST method (...
Java generics - why is “extends T” allowed but not “implements T”?
...
To add to the confusion getFoo(List<? super Foo> fooList) ONLY works with the class that literally are extended by Foo like class Foo extends WildcardClass. In this case a List<WildcardClass> would be acceptable input. However any class...
regex for matching something if it is not preceded by something else
...
You want to use negative lookbehind like this:
\w*(?<!foo)bar
Where (?<!x) means "only if it doesn't have "x" before this point".
See Regular Expressions - Lookaround for more information.
Edit: added the \w* to capture the characters before (e.g. "beach").
...
Why use def main()? [duplicate]
...
if the content of foo.py
print __name__
if __name__ == '__main__':
print 'XXXX'
A file foo.py can be used in two ways.
imported in another file : import foo
In this case __name__ is foo, the code section does not get execute...
Is key-value observation (KVO) available in Swift?
...Object subclass. Consider that you wanted to observe the bar property of a Foo class. In Swift 4, specify bar as dynamic property in your NSObject subclass:
class Foo: NSObject {
@objc dynamic var bar = 0
}
You can then register to observe changes to the bar property. In Swift 4 and Swift 3.2...