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Why covariance and contravariance do not support value type
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@André: C# is not Java. The C#'s int keyword is an alias for the BCL's System.Int32, which is in fact a subtype of object (an alias of System.Object). In fact, int's base class is System.ValueType who's base class is System.Object. Try evaluat...
What is the smallest possible valid PDF?
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In Java, use this:
private static String samplepdf = "255044462D312E0D747261696C65723C3C2F526F6F743C3C2F50616765733C3C2F4B6964735B3C3C2F4D65646961426F785B302030203320335D3E3E5D3E3E3E3E3E3E";
and then
byte[] bytes = hexStringTo...
Actionbar notification count icon (badge) like Google has
...h="2dp"/>
</shape>
com/ubergeek42/WeechatAndroid/WeechatActivity.java
Here we make it clickable and updatable! I created an abstract listener that provides Toast creation on onLongClick, the code was taken from from the sources of ActionBarSherlock.
private int hot_number = 0;
private Te...
Why do we need boxing and unboxing in C#?
...erence type wrapping the value type. unless i am mistaken, that is true in Java, but not C#. In C# the ones that show up blue in the IDE are aliases for their struct definition. So: int = Int32, bool = Boolean, string = String. The reason to use bool over Boolean is because it is suggested as so in ...
How can I profile C++ code running on Linux?
...t call-stack samples of the thread pool at a point in time, as there is in Java.
P.P.S As a rough generality, the more layers of abstraction you have in your software, the more likely you are to find that that is the cause of performance problems (and the opportunity to get speedup).
Added: It mig...
When do I use a dot, arrow, or double colon to refer to members of a class in C++?
Coming from other C-derived languages (like Java or C#) to C++, it is at first very confusing that C++ has three ways to refer to members of a class: a::b , a.b , and a->b . When do I use which one of these operators?
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Why aren't python nested functions called closures?
...routine, whatever. In Ruby, methods can't be closures, only blocks can. In Java, methods can't be closures, but classes can. That doesn't make them any less of a closure. (Although the fact that they only close over some variables, and they cannot modify them, makes them next to useless.) You could ...
Simple explanation of MapReduce?
...and commodity-computer clusters. In contrast to Hadoop, that is written in Java, the Google’s framework is written in C++. The document describes how a parallel framework would behave using the Map and Reduce functions from functional programming over large data sets.
In this solution there would ...
Maximum number of characters using keystrokes A, Ctrl+A, Ctrl+C and Ctrl+V
...f 6 < N < 11 then K=2 ; otherwise: K=ceil((N+1)/5)
Written in C/C++/Java: int K = (N<7)?(1) : (N<11)?(2) : ((N+5)/5);
And if N > 10, then the number of words with length 3 will be: K*5-1-N. With this, we can calculate the number of printed As:
If N > 10, the number of As will be...
What is Common Gateway Interface (CGI)?
...g, and CGI became almost synonymous with Perl for a while. Then there came Java Servlets, PHP and a bunch of others and took over large parts of Perl's market share.
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