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How to implement the factory method pattern in C++ correctly
There's this one thing in C++ which has been making me feel uncomfortable for quite a long time, because I honestly don't know how to do it, even though it sounds simple:
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What is the difference between statically typed and dynamically typed languages?
...ages
A language is statically typed if the type of a variable is known at compile time. For some languages this means that you as the programmer must specify what type each variable is (e.g.: Java, C, C++); other languages offer some form of type inference, the capability of the type system to dedu...
What is the difference between JDK and JRE?
...Java Runtime Environment. It is a package of everything necessary to run a compiled Java program, including the Java Virtual Machine (JVM), the Java Class Library, the java command, and other infrastructure. However, it cannot be used to create new programs.
The JDK is the Java Development Kit, the...
How many bytes does one Unicode character take?
...ed with usually a character. I say usually because there are concepts like combining characters. You may be familiar with things like accents, or umlauts. Those can be used with another character, such as an a or a u to create a new logical character. A character therefore can consist of 1 or more c...
Converting JSON String to Dictionary Not List
...ting list slice. What you need to use to get the result you want is a list comprehension:
[p[0] for p in datapoints[0:5]]
Here's a simple way to calculate the mean:
sum(p[0] for p in datapoints[0:5])/5. # Result is 35.8
If you're willing to install NumPy, then it's even easier:
import numpy
j...
Thread pooling in C++11
...hese code and and I have a bad memory. Sorry that I cannot provide you the complete thread pool code, that would violate my job integrity.
Edit: to terminate the pool, call the shutdown() method:
XXXX::shutdown(){
{
unique_lock<mutex> lock(threadpool_mutex);
terminate_pool = true;} /...
Spring Boot application as a Service
...ion packaged as executable jar as a Service in the Linux system? Is this recommended approach, or should I convert this app to war and install it into Tomcat?
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Creating a textarea with auto-resize
...t find any way to shrink it to the correct size - the clientHeight value comes back as the full size of the textarea , not its contents.
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What is the difference between String and string in C#?
.... It's like int vs. System.Int32.
As far as guidelines, it's generally recommended to use string any time you're referring to an object.
e.g.
string place = "world";
Likewise, I think it's generally recommended to use String if you need to refer specifically to the class.
e.g.
string greet ...
What is reflection and why is it useful?
...ass().getMethod("doSomething", null);
method.invoke(foo, null);
One very common use case in Java is the usage with annotations. JUnit 4, for example, will use reflection to look through your classes for methods tagged with the @Test annotation, and will then call them when running the unit test.
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