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How can I create directory tree in C++/Linux?
...
With C++17 or later, there's the standard header <filesystem> with
function
std::filesystem::create_directories
which should be used in modern C++ programs.
The C++ standard functions do not have the POSIX-specific expli...
Get name of caller function in PHP?
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edited Nov 25 '15 at 18:16
Community♦
111 silver badge
answered Oct 10 '08 at ...
How can I get a precise time, for example in milliseconds in Objective-C?
...timeIntervalSince* methods will return a NSTimeInterval which is a double with sub-millisecond accuracy. NSTimeInterval is in seconds, but it uses the double to give you greater precision.
In order to calculate millisecond time accuracy, you can do:
// Get a current time for where you want to star...
How to check whether a variable is a class or not?
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edited Apr 16 '16 at 23:23
Eric Leschinski
114k4949 gold badges368368 silver badges313313 bronze badges
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How to filter array in subdocument with MongoDB [duplicate]
...atch so that you can filter individual elements and then use $group to put it back together:
db.test.aggregate([
{ $match: {_id: ObjectId("512e28984815cbfcb21646a7")}},
{ $unwind: '$list'},
{ $match: {'list.a': {$gt: 3}}},
{ $group: {_id: '$_id', list: {$push: '$list.a'}}}
])
o...
What really happens in a try { return x; } finally { x = null; } statement?
...- at the IL level you can't return from inside an exception-handled block. It essentially stores it in a variable and returns afterwards
i.e. similar to:
int tmp;
try {
tmp = ...
} finally {
...
}
return tmp;
for example (using reflector):
static int Test() {
try {
return SomeNu...
Super-simple example of C# observer/observable with delegates
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The observer pattern is usually implemented with events.
Here's an example:
using System;
class Observable
{
public event EventHandler SomethingHappened;
public void DoSomething() =>
SomethingHappened?.Invoke(this, EventArgs.Empty);
}
class Obser...
How do I install cygwin components from the command line?
...o tool specifically in the 'setup.exe' installer that offers the
functionality of apt-get. There is, however, a command-line package installer
for Cygwin that can be downloaded separately, but it is not entirely stable and
relies on workarounds.
apt-cyg: http://github.com/transcode-open/apt-cyg
C...
Remove a string from the beginning of a string
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Plain form, without regex:
$prefix = 'bla_';
$str = 'bla_string_bla_bla_bla';
if (substr($str, 0, strlen($prefix)) == $prefix) {
$str = substr($str, strlen($prefix));
}
Takes: 0.0369 ms (0.000,036,954 seconds)
And with:
$prefix...
What is the _references.js used for?
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edited Dec 16 '16 at 15:41
Hakan Fıstık
9,09888 gold badges5757 silver badges8686 bronze badges
...