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Structs versus classes
...er that usual.
Example:
Value[] list = new Value[N];
for (int i = 0; i < N; i++)
{
list[i].id = i;
list[i].isValid = true;
}
is about 2 to 3 times faster than
Value[] list = new Value[N];
for (int i = 0; i < N; i++)
{
list[i] = new Value(i, true);
}
where Value is a stru...
How can I clear an HTML file input with JavaScript?
...file";
}
}catch(e){}
Works with most browsers. Does not work with IE < 9, that's all.
Tested on firefox 20, chrome 24, opera 12, IE7, IE8, IE9, and IE10.
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...
Windows equivalent to UNIX pwd
.... if dir is not supplied, the value of the HOME shell variable is the default."
– Daniel Stevens
May 2 '19 at 10:09
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What is the difference between “long”, “long long”, “long int”, and “long long int” in C++?
... type. Ditto for long long being a specifier for the long long int type.
Although the C++ standard itself doesn't specify the minimum ranges of integral types, it does cite C99, in 1.2 Normative references, as applying. Hence the minimal ranges as set out in C99 5.2.4.2.1 Sizes of integer types <...
Should everything really be a bundle in Symfony 2.x?
...fine controllers as services and put them under the Controller namespace:
<?php
namespace Vendor\Controller;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Sensio\Bundle\Framewor...
Using arrays or std::vectors in C++, what's the performance gap?
...0 invoked with g++ -O3 -S on a
// x86_64-suse-linux machine.
#include <vector>
struct S
{
int padding;
std::vector<int> v;
int * p;
std::vector<int>::iterator i;
};
int pointer_index (S & s) { return s.p[3]; }
// movq 32(%rdi), %rax
// movl 12(%rax), %e...
Why use apparently meaningless do-while and if-else statements in macros?
...ly brackets, you'd get a bad surprise.
if (corge)
BAR(corge);
else
gralt();
The above code would expand into
if (corge)
f(corge); g(corge);
else
gralt();
which is syntactically incorrect, as the else is no longer associated with the if. It doesn't help to wrap things in curly braces w...
How does the following LINQ statement work?
...on called Immediate Query Execution, which is useful for caching query results. From Suprotim Agarwal again:
To force immediate execution of a query that does not produce a singleton value, you can call the ToList(), ToDictionary(), ToArray(), Count(), Average() or Max() method on a query or qu...
How do I jump out of a foreach loop in C#?
... sList)
{
if (s.equals("ok"))
return true;
}
return false;
Alternatively, if you need to do some other things after you've found the item:
bool found = false;
foreach (string s in sList)
{
if (s.equals("ok"))
{
found = true;
break; // get out of the loop
}...
Android studio using > 100% CPU at all times - no background processes appear to be running
...e IDE (like auto-complete, and some icons have disappeared, probably no realtime git support?)
– Matt
Jan 29 '14 at 20:34
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