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Is optimisation level -O3 dangerous in g++?
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In the early days of gcc (2.8 etc.) and in the times of egcs, and redhat 2.96 -O3 was quite buggy sometimes. But this is over a decade ago, and -O3 is not much different than other levels of optimizations (in buggyness).
It does however tend to reveal ca...
An “and” operator for an “if” statement in Bash
...(man test).
As some find lines like if test -f filename; then foo bar; fi, etc. annoying, on most systems you find a program called [ which is in fact only a symlink to the test program. When test is called as [, you have to add ] as the last positional argument.
So if test -f filename is basically ...
jQuery UI accordion that keeps multiple sections open?
...on to the question at all. The accordion docu and list of options, events, etc. is just poor. And instead of telling the user "if we dont have the options for you - dont use it!" they should say "sorry that there is no option for that yet, but we welcome any contributors that add functionality to ou...
How to emulate C array initialization “int arr[] = { e1, e2, e3, … }” behaviour with std::array?
...ote that decaying is important to allow mixing of T, T&, T const & etc.):
template <typename ...Args> struct all_same { static const bool value = false; };
template <typename S, typename T, typename ...Args> struct all_same<S, T, Args...>
{
static const bool value = std:...
What is the relationship between the docker host OS and the container base image OS?
...ou would need some kind of virtualization within the container (qemu, kvm, etc.)
Docker manage images that are the file system representation. You can install any linux distribution or simply put binaries.
Indeed, for the convenience of the example, we often rely on the base images, but you could ...
difference between variables inside and outside of __init__()
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That's not what python does for me. Lists/dicts/etc get shared between all instances if you don't create them in __init__().
– too much php
Oct 8 '09 at 11:43
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How to change highlighted occurrences color in Eclipse's sidebar?
...rences" enabled in Eclipse, placing the cursor on any type/variable/method/etc will highlight all occurrences in the text editor and place a faint bar in the right ruler to show you the location of other occurrences in the file.
...
querySelector, wildcard element match?
...'iframe[src*="youtube"]');
Then, we can, for example, get the src stuff, etc ...
console.log(youtubeDiv.src);
//> "http://www.youtube.com/embed/Jk5lTqQzoKA"
console.debug(youtubeDiv);
//> (...)
share
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How to generate a random alpha-numeric string?
...52, which is probably less likely than undetected errors from cosmic rays, etc.
Comparison with UUIDs
According to their specification, UUIDs are not designed to be unpredictable, and should not be used as session identifiers.
UUIDs in their standard format take a lot of space: 36 characters for ...
What is JavaScript garbage collection?
...ctor runs. First it puts a
"mark" on every object, variable,
string, etc – all the memory tracked
by the GC. (JScript uses the VARIANT
data structure internally and there
are plenty of extra unused bits in
that structure, so we just set one of
them.)
Second, it clears the mark o...