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When does invoking a member function on a null instance result in undefined behavior?
...rstand is why it's undefined behavior to dereference a null pointer. In C++03, there's actually a bit of ambiguity here.
Although "dereferencing a null pointer results in undefined behavior" is mentioned in notes in both §1.9/4 and §8.3.2/4, it's never explicitly stated. (Notes are non-normative....
How to empty/destroy a session in rails?
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To clear the whole thing use the reset_session method in a controller.
reset_session
Here's ...
Is there a Java standard “both null or equal” static method?
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edited Jun 20 at 9:12
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111 silver badge
answered Feb 20 '12 at 15:31
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Correct way to use get_or_create?
...rying to use get_or_create for some fields in my forms, but I'm getting a 500 error when I try to do so.
5 Answers
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Fixed stroke width in SVG
...in browsers that support those parts from SVG Tiny 1.2, for example Opera 10. The fallback includes writing a small script to do the same, basically inverting the CTM and applying it on the elements that shouldn't scale.
If you want sharper lines you can also disable antialiasing (shape-rendering=o...
Inline code highlighting in reStructuredText
...of docutils to which it refers. The code role is not available in docutils 0.8.1 (which is the only version I have to test against).
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Where are ${EXECUTABLE_NAME} and ${PRODUCT_NAME} defined
... BesiBesi
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Programmatically get the cache line size?
...el), you can get this information out of /sys:
/sys/devices/system/cpu/cpu0/cache/
This directory has a subdirectory for each level of cache. Each of those directories contains the following files:
coherency_line_size
level
number_of_sets
physical_line_partition
shared_cpu_list
shared_cpu_map
s...
Cannot pass null argument when using type hinting
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PHP 7.1 or newer (released 2nd December 2016)
You can explicitly declare a variable to be null with this syntax
function foo(?Type $t) {
}
this will result in
$this->foo(new Type()); // ok
$this->foo(null); // ok
$this->foo(); // error
So, if you wan...
Suppress echo of command invocation in makefile?
...nswered Apr 1 '12 at 18:38
user405725user405725
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