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How does PHP 'foreach' actually work?
...r small variation, this time we'll assign the array to another variable:
$foo = $array;
foreach ($array as $val) {
var_dump(current($array));
}
/* Output: 1 1 1 1 1 */
Here the refcount of the $array is 2 when the loop is started, so for once we actually have to do the duplication upfront. Th...
Using getopts to process long and short command line options
...ns, use shorter non-ambiguous forms of long-options, use either the --file foo.txt or --file=foo.txt style, use either the -m 4096 or -m4096 style, mix options and non-options in any order, etc. getopt also outputs an error message if unrecognized or ambiguous options are found.
NOTE: There are ac...
C++ Modules - why were they removed from C++0x? Will they be back later on?
...and classes:
export {
int f(int);
double g(double, int);
int foo;
namespace Calc {
int add(int a, int b);
}
}
void not_exported_function(char* foo);
An important change of modules will be that macros and preprocessor definitions will be local to modules and...
The new syntax “= default” in C++11
... (15.4), ..." It makes no difference in this specific case, but in general foo() = default; has a slight advantage over foo() {}.
– Casey
Dec 30 '13 at 4:01
...
What does the “Just” syntax mean in Haskell?
...ion of a null). Basically, if your function would normally return the type Foo, it instead should return the type Maybe Foo. If you want to indicate that there's no value, return Nothing. If you want to return a value bar, you should instead return Just bar.
So basically, if you can't have Nothing,...
Should I use SVN or Git? [closed]
...ight there in the log.
Creating a repository is a trivial operation:
mkdir foo; cd foo; git init
That's it. Which means I create a Git repository for everything these days. I tend to use one repository per class. Most of those repositories are under 1 MB in disk as they only store lecture notes, hom...
How to use Regular Expressions (Regex) in Microsoft Excel both in-cell and loops
...ested: stackoverflow.com/questions/30218413/…
– Armfoot
May 13 '15 at 14:58
11
Late binding lin...
Why are there two kinds of functions in Elixir?
...ctions.
Everything in elixir is an expression. So
MyModule.my_function(foo)
is not a function but the expression returned by executing the code in my_function. There is actually only one way to get a "Function" that you can pass around as an argument and that is to use the anonymous function ...
How can I profile C++ code running on Linux?
...ed sampling for, uh, time. It then apportions times sampled in a function foo() back to the callers of foo(), in proprtion to the numberr of calls. So it doesn't distinguish between calls of different costs.
– Krazy Glew
Apr 28 '12 at 5:45
...
Should I implement __ne__ in terms of __eq__ in Python?
...ich checks for identity (see do_richcompare and our evidence below)
class Foo:
def __ne__(self, other):
return NotImplemented
__eq__ = __ne__
f = Foo()
f2 = Foo()
And the comparisons:
>>> f == f
True
>>> f != f
False
>>> f2 == f
False
>>> f2 !...