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Prefer composition over inheritance?
...rs. Inheritance is more rigid as most languages do not allow you to derive from more than one type. So the goose is more or less cooked once you derive from TypeA.
My acid test for the above is:
Does TypeB want to expose the complete interface (all public methods no less) of TypeA such that Typ...
EC2 instance types's exact network performance?
...(!!!)
t2.large = ~500 MBit/s
c3.large = ~500-570 Mbit/s (different results from different sources)
c4.large = ~520 MBit/s (I've confirmed this independently, by the way)
m3.large is better at ~700 MBit/s
m4.large is ~445 Mbit/s
r3.large is ~390 Mbit/s
Burstable (T2) instances appear to exhibit bur...
Convert datetime to Unix timestamp and convert it back in python
...f your original naive datetime was UTC, the way to recover it is to use utcfromtimestamp instead of fromtimestamp.
On the other hand, if your original naive datetime was local, you shouldn't have subtracted a UTC timestamp from it in the first place; use datetime.fromtimestamp(0) instead.
Or, if y...
Lost my schema.rb! Can it be regenerated?
...them is db:schema:dump which will recreate the schema.rb for the Rails app from the database.
bundle exec rake db:schema:dump
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Send a file via HTTP POST with C#
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Using .NET 4.5 (or .NET 4.0 by adding the Microsoft.Net.Http package from NuGet) there is an easier way to simulate form requests. Here is an example:
private async Task<System.IO.Stream> Upload(string actionUrl, string paramString, Stream paramFileStream, byte [] paramFileBytes)
{
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Converting an int to std::string
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boost::lexical_cast<std::string>(yourint) from boost/lexical_cast.hpp
Work's for everything with std::ostream support, but is not as fast as, for example, itoa
It even appears to be faster than stringstream or scanf:
http://www.boost.org/doc/libs/1_53_0/doc/htm...
How to make my custom type to work with “range-based for loops”?
...n overload will not be called by a for(:) loop. See [stmt.ranged] 1.2-1.3 from n4527.
² Either call the begin/end method, or ADL-only lookup of free function begin/end, or magic for C-style array support. Note that std::begin is not called unless range_expression returns an object of type in nam...
What are the big improvements between guava and apache equivalent libraries?
...pache collections, string utils, etc. I need to decide if we should switch from the apache foundations implementation.
3 An...
CSS transition effect makes image blurry / moves image 1px, in Chrome?
...0 update
If you have issues with blurry images, be sure to check answers from below as well, especially the image-rendering CSS property.
For best practice accessibility and SEO wise you could replace the background image with an <img> tag using object-fit CSS property.
Original answer
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Double not (!!) operator in PHP
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Using !! is a habit remaining from programming in C(++). In C doing a cast isn't as easy as in PHP, you can get many different problems, compile warnings, a.s.o. Thus people cast to boll by using !!.
– NikiC
Sep 20 '...