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Error “initializer element is not constant” when trying to initialize variable with const
...dialect setting I used. I don's see anything like that listed on GCC's web site as a C language extension. In other words, I have no idea how and why it compiles in ideone. Even if it compiles as a language extension, it should still produce a diagnostic message in C.
– AnT
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Pointer expressions: *ptr++, *++ptr and ++*ptr
...hen increments dereferenced value
And here's a fourth, every bit as much fun as the other three:
(*ptr)++ // effectively forces a dereference, then increments dereferenced value
The first and second will crash if ptr is actually an array identifier. The third and fourth will crash if ptr points...
Generating a drop down list of timezones with PHP
Most sites need some way to show the dates on the site in the users preferred timezone. Below are two lists that I found and then one method using the built in PHP DateTime class in PHP 5.
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How do I browse an old revision of a Subversion repository through the web view?
... querystring.
i.e. http://trac.example.com/log/trunk/client/filename?rev=123
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Python, remove all non-alphabet chars from string
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123
Use re.sub
import re
regex = re.compile('[^a-zA-Z]')
#First parameter is the replacement, se...
?: operator (the 'Elvis operator') in PHP
...lse ?: 0); // 0
var_dump(null ?: 'foo'); // 'foo'
var_dump(true ?: 123); // true
var_dump('rock' ?: 'roll'); // 'rock'
?>
By the way, it's called the Elvis operator.
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How to trace the path in a Breadth-First Search?
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I thought I'd try code this up for fun:
graph = {
'1': ['2', '3', '4'],
'2': ['5', '6'],
'5': ['9', '10'],
'4': ['7', '8'],
'7': ['11', '12']
}
def bfs(graph, forefront, end):
# assumes no cycles
next_...
Declare a constant array
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Just for clarification: the [...]T syntax is sugar for [123]T. It creates a fixed size array, but lets the compiler figure out how many elements are in it.
– jimt
Oct 30 '12 at 11:21
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When does invoking a member function on a null instance result in undefined behavior?
...ult in undefined behavior. It's always undefined behavior to call a member function through a null pointer. If the function is static, it's technically undefined as well, but there's some dispute.
The first thing to understand is why it's undefined behavior to dereference a null pointer. In C++03...
PHP best way to MD5 multi-dimensional array?
...answer. Seriously, use serialize and annoy your users with an immense slow site. Epic +1 @NathanJ.Brauer!
– ReSpawN
Mar 27 '14 at 9:24
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