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What are the differences between a pointer variable and a reference variable in C++?
...compiling error
int &r = *p; <--- likely no compiling error, especially if the nullptr is hidden behind a function call, yet it refers to a non-existent int at address 0
Pointers can iterate over an array; you can use ++ to go to the next item that a pointer is pointing to, and + 4 to go to...
How to test my servlet using JUnit
...ckito to have the mock return the correct params, verify they were indeed called (optionally specify number of times), write the 'result' and verify it's correct.
import static org.junit.Assert.*;
import static org.mockito.Mockito.*;
import java.io.*;
import javax.servlet.http.*;
import org.apache....
What's the right way to pass form element state to sibling/parent elements?
... in your root component? I can't speak for the creators of React, but generally, I find this to be a proper solution.
Maintaining state is one of the reasons (at least I think) that React was created. If you've ever implemented your own state pattern client side for dealing with a dynamic UI that ...
What is a stream?
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A stream represents a sequence of objects (usually bytes, but not necessarily so), which can be accessed in sequential order. Typical operations on a stream:
read one byte. Next time you read, you'll get the next byte, and so on.
read several bytes from the stream into...
Watermark / hint text / placeholder TextBox
How can I put some text into a TextBox which is removed automatically when user types something in it?
33 Answers
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Is it abusive to use IDisposable and “using” as a means for getting “scoped behavior” for exception
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I don't think so, necessarily. IDisposable technically is meant to be used for things that have non-managed resources, but then the using directive is just a neat way of implementing a common pattern of try .. finally { dispose }.
A purist would argue 'yes - it's abusive', ...
When should one use a spinlock instead of mutex?
...eed, because the mutex is already locked, it will go to sleep, immediately allowing another thread to run. It will continue to sleep until being woken up, which will be the case once the mutex is being unlocked by whatever thread was holding the lock before. When a thread tries to lock a spinlock an...
How do I use reflection to call a generic method?
What's the best way to call a generic method when the type parameter isn't known at compile time, but instead is obtained dynamically at runtime?
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Why is C so fast, and why aren't other languages as fast or faster? [closed]
...eaving the former assertion for another post, what is special about C that allows it to be faster than other languages? Or put another way: what's to stop other languages from being able to compile down to binary that runs every bit as fast as C?
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What is the difference between a strongly typed language and a statically typed language?
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What is the difference between a strongly typed language and a statically typed language?
A statically typed language has a type system that is checked at compile time by the implementation (a compiler or interpreter). The type check rejects some programs, and programs that pass the check u...