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JNI converting jstring to char *
...StringUTFChars(javaString, nativeString);
Can fix this errors:
1.error: base operand of '->' has non-pointer type 'JNIEnv {aka _JNIEnv}'
2.error: no matching function for call to '_JNIEnv::GetStringUTFChars(JNIEnv*&, _jstring*&, bool)'
3.error: no matching function for call to '_JNIE...
'and' (boolean) vs '&' (bitwise) - Why difference in behavior with lists vs numpy arrays?
...umPy arrays (of length > 1) have no truth value as this prevents vector-based logic confusion.
Example 4 is simply a vectorized bit and operation.
Bottom Line
If you are not dealing with arrays and are not performing math manipulations of integers, you probably want and.
If you have vectors o...
Why do you need explicitly have the “self” argument in a Python method?
...etimes don't.
Python elects to make things like this explicit rather than based on a rule.
Additionally, since nothing is implied or assumed, parts of the implementation are exposed. self.__class__, self.__dict__ and other "internal" structures are available in an obvious way.
...
Proper way to handle multiple forms on one page in Django
...e is my simplified example of two forms AForm and BForm using TemplateView based on the answers by @adam-nelson and @daniel-sokolowski and comment by @zeraien (https://stackoverflow.com/a/17303480/2680349):
# views.py
def _get_form(request, formcls, prefix):
data = request.POST if prefix in req...
Double Negation in C++
I just came onto a project with a pretty huge code base.
14 Answers
14
...
How do I capture the output of a script if it is being ran by the task scheduler?
...string output of internal Windows environment variables and slices them up based on character position. Because of this, the exact values supplied in the examples below may not be correct for the region of Windows you use. Also, with some regional settings, some components of the date or time may ...
JavaScript: clone a function
...h assertion errors are included in the gist's comment.
Plus my two cents (based on the author's suggestion):
clone0 cent (faster but uglier):
Function.prototype.clone = function() {
var newfun;
eval('newfun=' + this.toString());
for (var key in this)
newfun[key] = this[key];
return ne...
copying all contents of folder to another folder using batch file?
...e "C:\My Folder\" you may get a nasty surprise. I recommend reading that SS64 page very carefully. For a full trip down the "what is an escape character in CMD" rabbit hole, see Escaping Double Quotes in Batch Script.
– jrh
Mar 12 '19 at 19:31
...
Virtualbox “port forward” from Guest to Host [closed]
...g:
# ping 192.168.5.1
PING 192.168.5.1 (192.168.5.1) 56(84) bytes of data.
64 bytes from 192.168.5.1: icmp_seq=1 ttl=128 time=2.30 ms
...
Firewall issues?
@Stranger suggested that in some cases it would be necessary to open used port (8000 or whichever is used) in firewall like this (example for uf...
Bidirectional 1 to 1 Dictionary in C#
...ection<KeyValuePair<TKey, TValue>> (this one and below are the base interfaces of the ones above)
ICollection
IReadOnlyCollection<KeyValuePair<TKey, TValue>>
IEnumerable<KeyValuePair<TKey, TValue>>
IEnumerable
Serialization using SerializableAttribute.
Debug view...