Questions tagged [language-construct]
The language-construct tag has no usage guidance, but it has a tag wiki.
language-construct
56
questions
4
votes
0
answers
213
views
Variable Overloading
This question originated in a discussion with a colleague and it is purely academic.
Is there any programming language that has variable overloading?
In Java and many other languages, there is ...
- 6,218
4
votes
1
answer
266
views
Where is PHP echo implemented in the source?
You can lookup built-in functions by searching for e.g. PHPAPI(stream_copy_to_stream) and find the implementation in ext/standard/streamsfuncs.c.
How to do that for a language construct like echo?
I ...
- 1,877
0
votes
1
answer
41
views
Can I use an implicit class name in Dart?
Is there any way to avoid having to explicitly specify a class name in Dart, when using it multiple times?
Let's say I have something like
class VehicleType{
static const int BICYCLE = 0;
...
- 18.2k
2
votes
2
answers
67
views
Does PHP have a facility to reduce the duplication of parameter declaration and initialization in the class and the constructor?
Consider writing the class below:
class SomeClass
{
/** @var array */
private $files;
/** @var string */
private $productName;
/** @var bool */
private $singlePage;
/** ...
- 8,069
0
votes
1
answer
41
views
How can few entities be used in different manner? What are those entities actually called?
I'm learning PHP.
While learning PHP, I noticed that there are few entities in PHP which are used in different fashion. Sometimes with the pair of parenthesis with the enclosing parameter/s between ...
- 12.9k
2
votes
2
answers
858
views
What does "array_expression" mean in php?
http://php.net/manual/en/control-structures.foreach.php
Trying to better understand the foreach loop. In the documentation above it states "The first form loops over the array given by ...
- 764
2
votes
1
answer
1k
views
C# equivalent of C++ std::vector<int>.end()
I was trying to rewrite some C++ code I found on the internet in C# for my hexagon sphere project, but I ran into the following code:
if((((*ti)->m_hexA) != tileNdx) && (find(nbrs. begin(),...
- 402
1
vote
0
answers
140
views
What is the purpose of this case label?
Inside boost/asio/coroutine.hpp there is case statement inside the definition of the macro yield which seems to be inaccessible:
switch (_coro_value ? 0 : 1) \
for (;;) \
case -1: if (...
- 17.9k
27
votes
6
answers
15k
views
Specifying default parameter when calling C++ function
Suppose I have code like this:
void f(int a = 0, int b = 0, int c = 0)
{
//...Some Code...
}
As you can evidently see above with my code, the parameters a,b, and c have default parameter values ...
- 11.5k
1
vote
1
answer
766
views
Is the Scala `match` construct syntactic sugar? If so, how does is work?
In
trait Expr
case class Number(n: Int) extends Expr
case class Sum(e1: Expr, e2: Expr) extends Expr
object CaseExample {
def eval(e: Expr): Int = e match {
case Number(n) => n
case Sum(...
- 12.8k
1
vote
2
answers
55
views
PHP Declarator In If-Statement Scope
This is pretty basic.
Let's say you define a variable in an if statement
if($stmt = $db->prepare($sql)) {
// do stuff
}
Can I access $stmt below the if statement?
Or does $stmt need to be ...
- 8,527
1
vote
1
answer
104
views
Can I use variable functions with language constructs?
This question here kinda address the issue. In my case I would like to call a function like empty() or is_int(). For example:
<?php
$foo = 'empty';
$test = NULL;
$foo($test);
This ...
- 2,893
78
votes
4
answers
28k
views
How can I emulate destructuring in C++?
In JavaScript ES6, there is a language feature known as destructuring. It exists across many other languages as well.
In JavaScript ES6, it looks like this:
var animal = {
species: 'dog',
...
- 37.4k
0
votes
0
answers
91
views
ruby construct for preserving original value of a variable after block execution
Sometimes I need to preserve the original value of a variable, do stuff and then restore its original value kind of like this:
def method
original_value = @variable
@variable = true
result = # ...
- 137
0
votes
4
answers
756
views
Does JavaScript have a language construct similar to the php list command?
Does JavaScript have a language construct or something similar to the php list command? http://php.net/manual/en/function.list.php
This command will assign the values of an array to variables in a ...
- 3,020