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Best practices for circular shift (rotate) operations in C++
...e branch and AND aren't optimized away). Use the _rotl / _rotr intrinsics from <intrin.h> on x86 (including x86-64).
gcc for ARM uses an and r1, r1, #31 for variable-count rotates, but still does the actual rotate with a single instruction: ror r0, r0, r1. So gcc doesn't realize that rotat...
How do I use define_method to create class methods?
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Derived from: Jay and Why, who also provide ways to make this prettier.
self.create_class_method(method_name)
(class << self; self; end).instance_eval do
define_method method_name do
...
end
end
end
Updat...
How to undo a git merge with conflicts
I am on branch mybranch1 . mybranch2 is forked from mybranch1 and changes were made in mybranch2 .
6 Answers
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Delegates in swift?
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It is not that different from obj-c.
First, you have to specify the protocol in your class declaration, like following:
class MyClass: NSUserNotificationCenterDelegate
The implementation will look like following:
// NSUserNotificationCenterDelega...
Iteration over std::vector: unsigned vs signed index variable
...to return size_t :) i don't understand you. if i were to subtract pointers from each other, difference_type would be the right choice.
– Johannes Schaub - litb
Jan 4 '09 at 9:38
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Mongoose — Force collection name
...ring,
password : String
}, { collection: 'userinfo' });
See this link from the Mongoose documentation for more information.
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How do I remove leading whitespace in Python?
...dit
As balpha pointed out in the comments, in order to remove only spaces from the beginning of the string, lstrip(' ') should be used:
>>> ' hello world with 2 spaces and a tab!'.lstrip(' ')
'\thello world with 2 spaces and a tab!'
Related question:
Trimming a string in Python
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Why is it bad practice to call System.gc()?
...you should be using this, you shouldn't"
EDIT to address a few concerns from the other thread:
After reading the thread you linked, there's a few more things I'd like to point out.
First, someone suggested that calling gc() may return memory to the system. That's certainly not necessarily true ...
C++ performance challenge: integer to std::string conversion
...trange metric, especially seeing how you don't remove trailing whitespaces from the string in your implementations. My updated code runs faster than your implementation with x64 VC++ 2005 on Core i7 920 (16.2M ops/s vs. 14.8M ops/s), _ltoa does 8.5M ops/s and sprintf() does 3.85M ops/s.
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How do I get out of a screen without typing 'exit'?
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Ctrl-A -> Ctrl-D just exits from the session for me, leaving it running in the background. Ctrl-A -> \ will exit the session completely (on Oracle Linux 6).
– Andrew Brennan
Apr 1 '19 at 16:03
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