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Java Class.cast() vs. cast operator
...) to avoid warnings in "generics land". I often see methods doing things like this:
@SuppressWarnings("unchecked")
<T> T doSomething() {
Object o;
// snip
return (T) o;
}
It's often best to replace it by:
<T> T doSomething(Class<T> cls) {
Object o;
// snip
...
In C# what is the difference between ToUpper() and ToUpperInvariant()?
... ToUpperInvariant uses the invariant culture.
The canonical example is Turkey, where the upper case of "i" isn't "I".
Sample code showing the difference:
using System;
using System.Drawing;
using System.Globalization;
using System.Threading;
using System.Windows.Forms;
public class Test
{
[S...
std::string to char*
...
It won't automatically convert (thank god). You'll have to use the method c_str() to get the C string version.
std::string str = "string";
const char *cstr = str.c_str();
Note that it returns a const char *; you aren't allowed to change the C-style string re...
Test if object implements interface
This has probably been asked before, but a quick search only brought up the same question asked for C#. See here.
7 Answer...
How do I turn on SQL debug logging for ActiveRecord in RSpec tests?
I have some RSpec tests for my models and I would like to turn on SQL ActiveRecord logging just like I see in the Rails server mode. How to do that?
...
String concatenation in Ruby
I am looking for a more elegant way of concatenating strings in Ruby.
16 Answers
16
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How do you get the width and height of a multi-dimensional array?
...
Reed CopseyReed Copsey
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How many characters can UTF-8 encode?
...ode. This covers the remainder of almost all Latin alphabets, and also Greek, Cyrillic, Coptic, Armenian, Hebrew, Arabic, Syriac and Tāna alphabets, as well as Combining Diacritical Marks.
Three bytes are needed for characters in the rest of the Basic Multilingual Plane, which contains virtual...
Why not inherit from List?
When planning out my programs, I often start with a chain of thought like so:
27 Answers
...
Java HashMap performance optimization / alternative
... million distinct objects. That is an average of 1,300 objects per hash bucket = very very bad. However if I turn the two arrays into a number in base 52 I am guaranteed to get a unique hash code for every object:
public int hashCode() {
// assume that both a and b are sorted
...