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Why do we need a pure virtual destructor in C++?
I understand the need for a virtual destructor. But why do we need a pure virtual destructor? In one of the C++ articles, the author has mentioned that we use pure virtual destructor when we want to make a class abstract.
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Scroll to the top of the page using JavaScript?
...to do with the question. It would be fine if the question was: What script and methods should I use to scroll to the top of the page? Correct answer is here: stackoverflow.com/questions/4147112/…
– skobaljic
Feb 11 '14 at 12:00
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How can I make grep print the lines below and above each matching line? [duplicate]
I have to parse a very large file and I want to use the command grep (or any other tool).
3 Answers
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Adding an identity to an existing column
I need to change the primary key of a table to an identity column, and there's already a number of rows in table.
19 Answe...
Setting an object to null vs Dispose()
I am fascinated by the way the CLR and GC works (I'm working on expanding my knowledge on this by reading CLR via C#, Jon Skeet's books/posts, and more).
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How do I run a program with a different working directory from current, from Linux shell?
...our prompt of the parent shell, in the directory you started from.
Error handling: To avoid running the program without having changed the directory, e.g. when having misspelled /c, make the execution of helloworld conditional:
(cd /c && /a/helloworld)
Reducing memory usage: To avoid hav...
Using sed and grep/egrep to search and replace
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Use this command:
egrep -lRZ "\.jpg|\.png|\.gif" . \
| xargs -0 -l sed -i -e 's/\.jpg\|\.gif\|\.png/.bmp/g'
egrep: find matching lines using extended regular expressions
-l: only list matching filenames
-R: search recursively th...
Colorized grep — viewing the entire file with highlighted matches
...y, "pattern|$" will match lines that have the pattern you're searching for AND lines that have an end -- that is, all of them. Because the end of a line isn't actually any characters, the colorized portion of the output will just be your pattern. Thanks Ryan!
– zslayton
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Get day of week in SQL Server 2005/2008
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finding this answer today, and it creeps me out that the sample result on your answer matches mine, then found out that days on july 2009 is the same as days today (july 2020), anyways thanks for the easy answer.
– Henry
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Is there a way to 'uniq' by column?
...eed the ,1 in -k1,1? why not just -k1?
– hello_there_andy
Nov 24 '14 at 20:10
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@hello_there_and...