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Why use prefixes on member variables in C++ classes
...e for most of the "bad rap" that prefixes get.
This notation is largely pointless in strongly typed languages e.g. in C++ "lpsz" to tell you that your string is a long pointer to a nul terminated string, when: segmented architecture is ancient history, C++ strings are by common convention pointers ...
How to check Google Play services version?
...
I found simple solution:
int v = getPackageManager().getPackageInfo(GoogleApiAvailability.GOOGLE_PLAY_SERVICES_PACKAGE, 0 ).versionCode;
But versionCode is deprecated in API 28, so you can use PackageInfoCompat:
long v = PackageInfoCompat.getLongV...
Regex Named Groups in Java
... groups ( http://www.regular-expressions.info/named.html ) so can anyone point me towards a third-party library that does?
...
Size of Matrix OpenCV
...
cv:Mat mat;
int rows = mat.rows;
int cols = mat.cols;
cv::Size s = mat.size();
rows = s.height;
cols = s.width;
Also note that stride >= cols; this means that actual size of the row can be greater than element size x cols. This is ...
In C++, what is a “namespace alias”?
... simply, the #define won't work.
namespace Mine { class MyClass { public: int i; }; }
namespace His = Mine;
namespace Yours { class Mine: public His::MyClass { void f() { i = 1; } }; }
Compiles fine. Lets you work around namespace/class name collisions.
namespace Nope { class Oops { public: int...
Java Reflection: How to get the name of a variable?
..., here's an alternative (which I wouldn't use - see below):
public void printFieldNames(Object obj, Foo... foos) {
List<Foo> fooList = Arrays.asList(foos);
for(Field field : obj.getClass().getFields()) {
if(fooList.contains(field.get()) {
System.out.println(fiel...
How to prevent custom views from losing state across screen orientation changes
...w.BaseSavedState class.
public class CustomView extends View {
private int stateToSave;
...
@Override
public Parcelable onSaveInstanceState() {
//begin boilerplate code that allows parent classes to save state
Parcelable superState = super.onSaveInstanceState();
SavedState s...
Getting current unixtimestamp using Moment.js
...to get the Unix TimeStamp using Moment.js.
I can find many functions which convert timestamp to date in moment.js.
I know that I can easily get the unix timestamp by using the following JavaScript function: Math.floor(new Date().getTime()/1000) .
...
How can I get every nth item from a List?
... Yes, I suppose it sort of depends what you mean by "nth," but your interpretation might be more common. Add or subtract from i to suit your needs.
– mqp
Mar 25 '09 at 17:39
...
What happens to C# Dictionary lookup if the key does not exist?
...ue if the key does exist, use Dictionary<TKey, TValue>.TryGetValue:
int value;
if (dictionary.TryGetValue(key, out value))
{
// Key was in dictionary; "value" contains corresponding value
}
else
{
// Key wasn't in dictionary; "value" is now 0
}
(Using ContainsKey and then the the ...