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The JPA hashCode() / equals() dilemma
...objects are persisted to a database. However, the problems stem
entirely from allowing objects to exist without an id before they are
saved. We can solve these problems by taking the responsibility of
assigning object IDs away from object-relational mapping frameworks
such as Hibernate. Inst...
Rename a git submodule
...tree but also updating the "submodule.<submodule name>.path" setting from the .gitmodules file and stage both.
This doesn't happen when no .gitmodules file is found and only issues a warning when it doesn't have a section for this submodule. This is because the user might just use plain gitl...
Iterating over every two elements in a list
...
You need a pairwise() (or grouped()) implementation.
For Python 2:
from itertools import izip
def pairwise(iterable):
"s -> (s0, s1), (s2, s3), (s4, s5), ..."
a = iter(iterable)
return izip(a, a)
for x, y in pairwise(l):
print "%d + %d = %d" % (x, y, x + y)
Or, more gen...
C++ Returning reference to local variable
... problem when returning reference to a local variable. How is it different from func2()?
3 Answers
...
What's wrong with using == to compare floats in Java?
...e best answer so far, but it is still flawed. Where do you get the epsilon from?
– Michael Piefel
Apr 27 '15 at 15:34
1
...
Removing index column in pandas when reading a csv
...
When reading to and from your CSV file include the argument index=False so for example:
df.to_csv(filename, index=False)
and to read from the csv
df.read_csv(filename, index=False)
This should prevent the issue so you don't need to fix ...
Reduce git repository size
...be also used after a filter-branch, to mark some directories to be removed from the history (with a further gain of space); see here. But that means nobody is pulling from your public repo. filter-branch can keep backup refs in .git/refs/original, so that directory can be cleaned too.
Finally, as ...
Exploring Docker container's file system
... container or what files exist in there. One example is downloading images from the docker index - you don't have a clue what the image contains so it's impossible to start the application.
...
Explain the concept of a stack frame in a nutshell
...atter it has loaded the local variables or not, it will immediately return from stack with it's stack frame. It means that whenever any recursive function get base condition satisfied and we put a return after base condition, the base condition will not wait to load local variables which are located...
How to get current foreground activity context in android?
...
Knowing that ActivityManager manages Activity, so we can gain information from ActivityManager. We get the current foreground running Activity by
ActivityManager am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
ComponentName cn = am.getRunningTasks(1).get(0).topActivity;
...