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Create singleton using GCD's dispatch_once in Objective-C
...ectly acceptable and thread-safe way to create an instance of your class. It may not technically be a "singleton" (in that there can only ever be 1 of these objects), but as long as you only use the [Foo sharedFoo] method to access the object, this is good enough.
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Extract substring in Bash
...in the form someletters_12345_moreleters.ext , I want to extract the 5 digits and put them into a variable.
22 Answers
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How do I read any request header in PHP
... of all headers, the quickest method is:
<?php
// Replace XXXXXX_XXXX with the name of the header you need in UPPERCASE (and with '-' replaced by '_')
$headerStringValue = $_SERVER['HTTP_XXXXXX_XXXX'];
ELSE IF: you run PHP as an Apache module or, as of PHP 5.4, using FastCGI (simple method):
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error: ‘uint16_t’ does not name a type - c++1y / stl - 清泛IT社区，为创新赋能！
...ocumentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to...
Express-js can't GET my static files, why?
.../static" to serve static content only when their request path is prefixed with "/static".
// GET /static/style.css etc.
app.use('/static', express.static(__dirname + '/public'));
share
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java get file size efficiently
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Well, I tried to measure it up with the code below:
For runs = 1 and iterations = 1 the URL method is fastest most times followed by channel. I run this with some pause fresh about 10 times. So for one time access, using the URL is the fastest way I...
Meaning of @classmethod and @staticmethod for beginner? [duplicate]
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Though classmethod and staticmethod are quite similar, there's a slight difference in usage for both entities: classmethod must have a reference to a class object as the first parameter, whereas staticmethod can have no parameters at all.
Example
class Date(object)...
What is the meaning of “__attribute__((packed, aligned(4))) ”
It is C language.It is written that:
3 Answers
3
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Why is `std::move` named `std::move`?
The C++11 std::move(x) function doesn't really move anything at all. It is just a cast to r-value. Why was this done? Isn't this misleading?
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How to add a progress bar to a shell script?
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You can implement this by overwriting a line. Use \r to go back to the beginning of the line without writing \n to the terminal.
Write \n when you're done to advance the line.
Use echo -ne to:
not print \n and
to recognize escape sequences like \r.
H...