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Pointers in C: when to use the ampersand and the asterisk?
I'm just starting out with pointers, and I'm slightly confused. I know & means the address of a variable and that * can be used in front of a pointer variable to get the value of the object that is pointed to by the pointer. But things work differently when you're working with arrays, string...
How does git merge after cherry-pick work?
...:
o---X <-- master
\
b1---b2---b3---b4 <-- b
Now we urgently need the commits b1 and b3 in master, but not the
remaining commits in b. So what we do is checkout the master branch
and cherry-pick commits b1 and b3:
$ git checkout master
$ git cherry-pick "b1's SHA"
...
Can I multiply strings in Java to repeat sequences? [duplicate]
...
I was looking for this since years and now I finally found it.
– Daniel S.
Apr 21 '15 at 21:00
...
Saving enum from select in Rails 4.1
...arkling</option>
</select>
Values went from "0" to "red" and now we're all set.
If you're using a regular ol' rails text_field it's:
f.select :color, Wine.colors.keys.to_a
If you want to have clean human-readable attributes you can also do:
f.select :color, Wine.colors.keys.ma...
How to sign an android apk file
... Application, and click
Next.
The Export Android Application wizard now starts, which will guide
you through the process of signing
your application, including steps for
selecting the private key with which
to sign the .apk (or creating a new
keystore and private key).
Complete th...
Drop unused factor levels in a subsetted data frame
...
It is a known issue, and one possible remedy is provided by drop.levels() in the gdata package where your example becomes
> drop.levels(subdf)
letters numbers
1 a 1
2 b 2
3 c 3
> levels(dro...
Check image width and height before upload with Javascript
...ed in a few browsers. Mostly firefox and chrome, could be opera as well by now.
P.S. The URL.createObjectURL() method has been removed from the MediaStream interface. This method has been deprecated in 2013 and superseded by assigning streams to HTMLMediaElement.srcObject. The old method was remove...
What are some alternatives to ReSharper? [closed]
... Devexpress's CodeRush Is not the same as Resharper. CodeRush, to my knowledge, improves productivity, rather than enforcing standards on Code-Style and also suggestions and code conversions and all that. which is in my opinion why its much faster than resharper on big solutions (+10 heavy pr...
How to run only one local test class on Gradle
... over all classes even all those not being run, which is too slow. Don't know if that slowness is due to our env or if it would impact others. Can update if finding more.
– arntg
Jan 30 '19 at 17:21
...
How to concatenate two strings in C++?
...td::string greet = s + " World"; //concatenation easy!
Easy, isn't it?
Now if you need char const * for some reason, such as when you want to pass to some function, then you can do this:
some_c_api(s.c_str(), s.size());
assuming this function is declared as:
some_c_api(char const *input, si...