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Why should Java ThreadLocal variables be static
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Because if it were an instance level field, then it would actually be "Per Thread - Per Instance", not just a guaranteed "Per Thread." That isn't normally the semantic you're looking for.
Usually it's holding something like objec...
Add x and y labels to a pandas plot
...ernatively, the index x-axis label is automatically set to the Index name, if it has one. so df2.index.name = 'x label' would work too.
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How do I list all loaded assemblies?
...i.e. pdb files that contain debug information).
Using Process Explorer
If you want an external tool you can use the Process Explorer (freeware, published by Microsoft)
Click on a process and it will show a list with all the assemblies used. The tool is pretty good as it shows other information ...
Backwards migration with Django South
...atabase tables to decide which ones are 'new').
However, you can also specify any migration by number, and South will migrate your database, either forward or backward, to take it to that point. So, with the example files above, if you have already migrated up to 0003, and you wanted to run 0003 in...
JavaScript listener, “keypress” doesn't detect backspace?
... KeyDown event is raised for all including nonprintable such as Control, Shift, Alt, BackSpace, etc.
UPDATE:
The keypress event is fired when a key is pressed down and that key normally produces a character value
Reference.
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Update a submodule to the latest commit
...er
Go back to the root directory & check update:
cd ..
git status
If the submodule updated before, it will show something like below:
# Not currently on any branch.
# Changed but not updated:
# (use "git add ..." to update what will be committed)
# (use "git checkout -- ..." to disca...
Difference between a Seq and a List in Scala
...ut habit is hard to break.
Seq is a good generalization for sequences, so if you program to interfaces, you should use that. Note that there are actually three of them: collection.Seq, collection.mutable.Seq and collection.immutable.Seq, and it is the latter one that is the "default" imported into ...
Difference between dispatch_async and dispatch_sync on serial queue?
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Yes. Using serial queue ensure the serial execution of tasks. The only difference is that dispatch_sync only return after the block is finished whereas dispatch_async return after it is added to the queue and may not finished.
for this code
dispatch_async(_serialQueue, ^{ printf("1"); });
print...
Count character occurrences in a string in C++
.... For some reason std::count returns type iterator_traits<InputIt>::difference_type, which for most standard containers is std::ptrdiff_t, not std::size_t.
– Daniel Stevens
Apr 15 at 7:48
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Ruby on Rails. How do I use the Active Record .build method in a :belongs to relationship?
...ough a
foreign key, but have not yet been
saved. Note: This only works if an
associated object already exists, not
if it‘s nil!
The answer to building in the opposite direction is a slightly altered syntax. In your example with the dogs,
Class Dog
has_many :tags
belongs_to :person...