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Use JNI instead of JNA to call native code?
...d a jni wrapper
If you need a lot of memory copying. For example, you call one method which returns you a large byte buffer, you change something in it, then you need to call another method which uses this byte buffer. This would require you to copy this buffer from c to java, then copy it back from...
Update value of a nested dictionary of varying depth
...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)
else:
...
Multiple working directories with Git?
...ry can support multiple working trees, allowing you to check out more than one branch at a time.
With git worktree add, a new working tree is associated with the repository.
This new working tree is called a "linked working tree" as opposed to the "main working tree" prepared by "git init" or "git...
What is the most efficient way to deep clone an object in JavaScript?
What is the most efficient way to clone a JavaScript object? I've seen obj = eval(uneval(o)); being used, but that's non-standard and only supported by Firefox . I've done things like obj = JSON.parse(JSON.stringify(o)); but question the efficiency. I've also seen recursive copying funct...
How do I create a dynamic key to be added to a JavaScript object variable [duplicate]
...s are objects, but not all objects are arrays. The primary difference (and one that's pretty hard to mimic with straight JavaScript and plain objects) is that array instances maintain the length property so that it reflects one plus the numeric value of the property whose name is numeric and whose v...
All Ruby tests raising: undefined method `authenticate' for nil:NilClass
...
in RSpec
as Jeffrey W. mentioned, in his answer above -> to set this to all controllers:
RSpec.configure do |config|
# ...
config.include Devise::TestHelpers, type: :controller
# ...
end
however, if this is relevant to just one spec, you don...
hexadecimal string to byte array in python
...
If anyone is looking for hex string -> bytes object, it's ` bytes.fromhex("000102030405060708090A0B0C0D0E0F")` which yields b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f'. Not posting as an answer since question a...
Equivalent C++ to Python generator pattern
... State { unsigned i, j; };
State make();
void next(State&);
bool isDone(State const&);
Of course, we wrap this as a proper class:
class PairSequence:
// (implicit aliases)
public std::iterator<
std::input_iterator_tag,
std::pair<unsigned, unsigned>
...
What are dictionary view objects?
... as well. This feature can be useful in some circumstances (for instance, one can work with a view on the keys in multiple parts of a program instead of recalculating the current list of keys each time they are needed)—note that if the dictionary keys are modified while iterating over the view, h...
Parsing boolean values with argparse
...;bool>
and still use a default value (specific to the user settings). One (indirectly related) downside with that approach is that the 'nargs' might catch a positional argument -- see this related question and this argparse bug report.
...