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Do declared properties require a corresponding instance variable?
...e Modern Objective-C Runtime (that's either iOS 3.x or greater, or 64-bit Snow Leopard or greater) then you do not need to define ivars for your properties in cases like this.
When you @synthesize the property, the ivar will in effect be synthesized also for you. This gets around the "fragile-ivar"...
How to replace captured groups only?
...e elegant solution >.< Nevertheless, I can move forward with my code now!
– mix3d
Mar 29 '16 at 22:16
9
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How to easily initialize a list of Tuples?
...
@BillW Not too certain this is the exact post, ... but I know Jon Skeet has written about it before.
– Steven Jeuris
Jul 20 '15 at 23:39
1
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How do I find the length of an array?
...pression so it doesn't have any drawbacks over the macro (at least none I know of).
You can also consider using std::array from C++11 which exposes its length with no overhead over a native C array.
C++17 has std::size() in the <iterator> header which does the same and works for STL containe...
Method call if not null in C#
...void SafeInvoke(this Action action) {
if(action != null) action();
}
now this is valid:
Action act = null;
act.SafeInvoke(); // does nothing
act = delegate {Console.WriteLine("hi");}
act.SafeInvoke(); // writes "hi"
In the case of events, this has the advantage of also removing the race-con...
Why aren't pointers initialized with NULL by default?
...ion point was he/she needed to perform some operation and then assign.
So now we have the situation that the compiler has added an extra instruction to the code that initializes the variable to NULL then later the developer code is added to do the correct initialization. Or under other conditions t...
Return from lambda forEach() in java
... a stream (I am assuming here that it is of type Collection<Player>, now you have a Stream<Player>.
Filter out all unwanted elements with a Predicate<Player>, mapping every player to the boolean true if it is wished to be kept.
Collect the resulting elements in a list, via a Collec...
while (1) vs. while(True) — Why is there a difference (in python 2 bytecode)?
... 0 (True)
6 BINARY_ADD
9 RETURN_VALUE
Now compare:
>>> dis.dis('1 + 1')
1 0 LOAD_CONST 1 (2)
3 RETURN_VALUE
It's emitting a LOAD_GLOBAL (True) for each True, and there's nothing the optimizer can do with a globa...
android get real path by Uri.getPath()
...lver.openInputStream() allow you to access the contents of a file without knowing its real path.
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Case statement with multiple values in each 'when' block
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I don't know why, but this strange situation happens: When I write this: when "toyota", "lexus", I get: unexpected tSTRING_BEG, expecting keyword_do or '{' or '(' (SyntaxError). However, when I write this: when "toyota","lexus", it...