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What is the difference between cout, cerr, clog of iostream header in c++? When to use which one?
I tried researching the difference between cout , cerr and clog on the internet but couldn't find a perfect answer. I still am not clear on when to use which. Can anyone explain to me, through simple programs and illustrate a perfect situation on when to use which one?
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How do I wait for an asynchronously dispatched block to finish?
I am testing some code that does asynchronous processing using Grand Central Dispatch. The testing code looks like this:
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Excluding files/directories from Gulp task
I have a gulp rjs task that concatenates and uglifies all my custom .JS files (any non vendor libraries).
2 Answers
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Abstract methods in Python [duplicate]
...seems too easy for me in Java yet up till now I have been unable to understand in Python which is surprising to me at least.
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How to pattern match using regular expression in Scala?
... would like to be able to find a match between the first letter of a word, and one of the letters in a group such as "ABC". In pseudocode, this might look something like:
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How to output only captured groups with sed?
...as well as specifying what you do want.
string='This is a sample 123 text and some 987 numbers'
echo "$string" | sed -rn 's/[^[:digit:]]*([[:digit:]]+)[^[:digit:]]+([[:digit:]]+)[^[:digit:]]*/\1 \2/p'
This says:
don't default to printing each line (-n)
exclude zero or more non-digits
include on...
How to capture the “virtual keyboard show/hide” event in Android?
...sed on whether the virtual keyboard is shown or not. I've searched the API and various blogs but can't seem to find anything useful.
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How to print something without a new line in ruby
...o, you'll need to append "\r" at end of line to indicate "carriage return" and do next print at beginning of current line
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Difference between String#equals and String#contentEquals methods
What is the difference between the String#equals method and the String#contentEquals method?
9 Answers
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When to use PNG or JPG in iPhone development?
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PNG's are pixel perfect (non-lossy), and require very little extra CPU energy to display. However, large PNGs may take longer to read from storage than more compressed image formats, and thus be slower to display.
JPG's are smaller to store, but lossy (amount ...