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How to determine if a type implements a specific generic interface type
...from TcKs it can also be done with the following LINQ query:
bool isBar = foo.GetType().GetInterfaces().Any(x =>
x.IsGenericType &&
x.GetGenericTypeDefinition() == typeof(IBar<>));
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Should struct definitions go in .h or .c file?
...to look inside struct s, while still allowing it to e.g. compile struct s *foo; (as long as foo is not later dereferenced).
Compare these versions of api.h and api.c:
Definition in header: Definition in implementation:
+---------------------------------+ +------------------------...
?: operator (the 'Elvis operator') in PHP
... left operand is truthy, and the right operand otherwise.
In pseudocode,
foo = bar ?: baz;
roughly resolves to
foo = bar ? bar : baz;
or
if (bar) {
foo = bar;
} else {
foo = baz;
}
with the difference that bar will only be evaluated once.
You can also use this to do a "self-check"...
How to create a checkbox with a clickable label?
...c variables do you like?</legend>
<input type="checkbox" name="foo" value="bar" id="foo_bar">
<label for="foo_bar">Bar</label>
<input type="checkbox" name="foo" value="baz" id="foo_baz">
<label for="foo_baz">Baz</label>
</fieldset>
...
When should the volatile keyword be used in C#?
...fully constructed object:
Thread 1 asks if a variable is null.
//if(this.foo == null)
Thread 1 determines the variable is null, so enters a lock.
//lock(this.bar)
Thread 1 asks AGAIN if the variable is null.
//if(this.foo == null)
Thread 1 still determines the variable is null, so it calls a const...
Passing just a type as a parameter in C#
...ic T GetColumnValue<T>(this string columnName){...} then you can say foo.GetColumnValues<string>(dm.mainColumn)
– Joshua G
Jun 4 '14 at 15:56
...
Reverse of JSON.stringify?
I'm stringyfing an object like {'foo': 'bar'}
8 Answers
8
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`static` keyword inside function?
...n their state. So be careful when writing OOP code.
Consider this:
class Foo
{
public function call()
{
static $test = 0;
$test++;
echo $test . PHP_EOL;
}
}
$a = new Foo();
$a->call(); // 1
$a->call(); // 2
$a->call(); // 3
$b = new Foo();
$b->c...
Object.watch() for all browsers?
... syntax from the Firefox way of adding observers. Instead of :
var obj = {foo:'bar'};
obj.watch('foo', fooChanged);
You do:
var obj = {foo:'bar'};
var watcher = createWatcher(obj);
watcher.watch('foo', fooChanged);
Not as sweet, but as an observer you are notified immediately.
...
Why does Javascript's regex.exec() not always return the same value? [duplicate]
...ore matches by performing the assignment as the loop condition.
var re = /foo_(\d+)/g,
str = "text foo_123 more text foo_456 foo_789 end text",
match,
results = [];
while (match = re.exec(str))
results.push(+match[1]);
DEMO: http://jsfiddle.net/pPW8Y/
If you don't like the pla...