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Is the “struct hack” technically undefined behavior?
...ll have been able to special-case code for single-element arrays (e.g. if *foo contains a single-element array boz, the expression foo->boz[biz()*391]=9; could be simplified as biz(),foo->boz[0]=9;). Unfortunately, compilers' rejection zero-element arrays means a lot of code uses single-elemen...
ASP.NET MVC Ajax Error handling
...e different than 200, the error callback is executed:
$.ajax({
url: '/foo',
success: function(result) {
alert('yeap');
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
alert('oops, something bad happened');
}
});
and to register a global error hand...
#ifdef vs #if - which is better/safer as a method for enabling/disabling compilation of particular s
...
#ifdef just checks if a token is defined, given
#define FOO 0
then
#ifdef FOO // is true
#if FOO // is false, because it evaluates to "#if 0"
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How can I print the contents of a hash in Perl?
...and expanded into multiple arguments - so %hsh=("a" => 1, "b" => 2); foo(%hsh); would be equivalent to foo("a", 1, "b", 2). If you instead want the function to operate on the hash itself, you need to pass a reference to the hash: foo(\%hsh); See perldoc.perl.org/perlsub.html#Pass-by-Reference
...
Javascript and regex: split string and keep the separator
...3".split(/(?!、)/g) == ["1、", "2、", "3"] for full words? For example "foo1, foo2, foo3,"
– Waltari
Nov 6 '17 at 10:17
...
Uppercase Booleans vs. Lowercase in PHP
...only way you can mess things up is by quoting those values, for example:
$foo = false; // FALSE
$bar = "false"; // TRUE
$foo2 = true; // TRUE
$bar2 = "true"; // TRUE
$foo3 = null; // NULL
$bar3 = "null"; // TRUE
Only thing restricting or encouraging you to use upper or lowercase might be ...
How does `is_base_of` work?
...on occurs before accessibility checks.
You can verify this simply:
class Foo
{
public:
void bar(int);
private:
void bar(double);
};
int main(int argc, char* argv[])
{
Foo foo;
double d = 0.3;
foo.bar(d); // Compiler error, cannot access private member function
}
The same applies...
What does the star operator mean, in a function call?
...
Just adding a footnote to the textbook answer - before syntactical support arrived, the same functionality was achieved with the built-in apply() function
– Jeremy Brown
May 27 '10 at 14:20
...
const vs constexpr on variables
...rameter be declared as const and not as constexpr: ie, would constexpr int foo(S) be executed at compile-time if I call foo(s0) ?
– Matthieu M.
Nov 12 '12 at 16:07
4
...
How to backup a local Git repository?
...n my other answer, after Kent Fredric's comment:
$ git bundle create /tmp/foo master
$ git bundle create /tmp/foo-all --all
$ git bundle list-heads /tmp/foo
$ git bundle list-heads /tmp/foo-all
(It is an atomic operation, as opposed to making an archive from the .git folder, as commented by fanta...