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Java Class.cast() vs. cast operator
...lt;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
return cls.cast(o);
}
That's the only use case for Class.cast(Object) I've ever come across.
Regarding compiler...
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 all...
Using Java 8's Optional with Stream::flatMap
...or some very concise java code, but I have come across a seemingly-simple situation that is tricky to do concisely.
12 Answ...
How do I pause my shell script for a second before continuing?
I have only found how to wait for user input. However, I only want to pause so that my while true doesn't crash my computer.
...
Is it possible to make an HTML anchor tag not clickable/linkable using CSS?
...;a style="" href="page.html" class="inactiveLink">page link</a>
It makes the link not clickeable and the cursor style an arrow, not a hand as the links have.
or use this style in the html:
<a style="pointer-events: none; cursor: default;" href="page.html">page link</a>
but...
How do I pass a string into subprocess.Popen (using the stdin argument)?
...nd data to
the process’s stdin, you need to
create the Popen object with
stdin=PIPE. Similarly, to get anything
other than None in the result tuple,
you need to give stdout=PIPE and/or
stderr=PIPE too.
Replacing os.popen*
pipe = os.popen(cmd, 'w', bufsize)
# ==>
p...
What does “:=” do?
I've seen := used in several code samples, but never with an accompanying explanation. It's not exactly possible to google its use without knowing the proper name for it.
...
How to efficiently concatenate strings in go
In Go, a string is a primitive type, which means it is read-only, and every manipulation of it will create a new string.
...
Eclipse - “Workspace in use or cannot be created, chose a different one.” [duplicate]
I'm trying to create a workspace in the /Users/Shared/ directory with the thought that I can share that workspace between users. The problem is that after I create the workspace and change the permission on it, I encounter the error below (image) without even switching to a different user.
...
Co-variant array conversion from x to y may cause run-time exception
...
What it means is this
Control[] controls = new LinkLabel[10]; // compile time legal
controls[0] = new TextBox(); // compile time legal, runtime exception
And in more general terms
string[] array = new string[10];
object[] obj...