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What is the definition of “interface” in object oriented programming
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I wouldn't use the word "protocol" for "interface." The word "protocol" implies a level of detail about how actions are carried out. "Interface" really is an excellent word with a pure English definition that strictly describes exactly what it ...
Purpose of Unions in C and C++
..., especially considering that it is only C99 that was initially clumsily worded, appearing to make type-punning through unions undefined. In reality, type-punning though unions is legal in C89, legal in C11, and it was legal in C99 all along although it took until 2004 for the committee to fix incor...
What is the meaning of polyfills in HTML5?
What is the meaning of polyfills in HTML5? I saw this word in many sites about HTML5, e.g. HTML5-Cross-Browser-Polyfills.
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What is the “-->” operator in C++?
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I don't think it's the same. I think the word "then" implies there is an order (after post decrementing, x's value is one less). I think one can say "You're post decrementing x and then comparing its old value and 0 ..." to make it clearer. But this is nitpicking an...
Process all arguments except the first one (in a bash script)
...otice the space between ':' and '-', otherwise it means different:
${var:-word} If var is null or unset,
word is substituted for var. The value of var does not change.
${var:+word} If var is set,
word is substituted for var. The value of var does not change.
Which is described in:Unix / Linux - ...
What is a “static” function in C?
...le bit of ambiguity. It's not your fault — the language just uses the keyword for two different things.
– Chuck
Feb 17 '09 at 18:40
2
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Select unique or distinct values from a list in UNIX shell script
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With zsh you can do this:
% cat infile
tar
more than one word
gz
java
gz
java
tar
class
class
zsh-5.0.0[t]% print -l "${(fu)$(<infile)}"
tar
more than one word
gz
java
class
Or you can use AWK:
% awk '!_[$0]++' infile
tar
more than one word
gz
java
class
...
Why can't the tag contain a tag inside it?
...y a div element (among others), the following
<p>
<div>some words</div>
</p>
is parsed as
<p></p>
<div>some words</div>
</p>
and the last </p> is an error.
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How do I replace whitespaces with underscore?
...d to underscores in URLs.
import re
def urlify(s):
# Remove all non-word characters (everything except numbers and letters)
s = re.sub(r"[^\w\s]", '', s)
# Replace all runs of whitespace with a single dash
s = re.sub(r"\s+", '-', s)
return s
# Prints: I-cant-get-no-satisfac...
What makes Scala's operator overloading “good”, but C++'s “bad”?
...ibility in defining method names plus a bit of built in precedence for non-word symbols. So technically Scala doesn't have operator overloading.
Whatever you want to call it, operator overloading isn't inherently bad, even in C++. The problem is when bad programmers abuse it. But frankly, I'm o...