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Why covariance and contravariance do not support value type
...or not.
You might want to read Eric Lippert's blog post on representation and identity for more on this topic in general.
EDIT: Having reread Eric's blog post myself, it's at least as much about identity as representation, although the two are linked. In particular:
This is why covariant and ...
Update value of a nested dictionary of varying depth
...ight general idea, i.e. a recursive solution, but somewhat peculiar coding and at least one bug. I'd recommend, instead:
Python 2:
import collections
def update(d, u):
for k, v in u.iteritems():
if isinstance(v, collections.Mapping):
d[k] = update(d.get(k, {}), v)
...
Rank items in an array using Python/NumPy, without sorting array twice
I have an array of numbers and I'd like to create another array that represents the rank of each item in the first array. I'm using Python and NumPy.
...
The program can't start because libgcc_s_dw2-1.dll is missing
..."]
[GNU gcc link options]
The latter discussion includes -static-libgcc and -static-libstdc++ linker options.
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What is a callback function?
...allback function is a function which is:
accessible by another function, and
is invoked after the first function if that first function completes
A nice way of imagining how a callback function works is that it is a function that is "called at the back" of the function it is passed into.
Maybe ...
Boolean vs boolean in Java
...
Yes you can use Boolean/boolean instead.
First one is Object and second one is primitive type.
On first one, you will get more methods which will be useful.
Second one is cheap considering memory expense The second will save you a lot more memory, so go for it
Now choose your way....
Java “lambda expressions not supported at this language level”
I was testing out some new features of Java 8 and copied the example into my IDE (Eclipse originally, then IntelliJ) as shown here
...
Difference between HEAD and master
What is the difference between the HEAD and master in Git?
3 Answers
3
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Difference between pre-increment and post-increment in a loop?
Is there a difference in ++i and i++ in a for loop? Is it simply a syntax thing?
22 Answers
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GitHub pull request showing commits that are already in target branch
... GitHub to a branch that isn't master. The target branch was behind master and the pull request showed commits from master, so I merged master and pushed it to GitHub, but the commits and diff for them still appear in the pull request after refreshing. I've doubled checked that the branch on GitHub ...