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g++ undefined reference to typeinfo
...access can happen when you create an object of the class, use dynamic_cast etc.
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JavaScript function similar to Python range()
...am: Thanks for pointing this out. I did not add defensive checks for types etc., but I implemented reverse order of elements - it now works exactly the same as Python counterpart, when the last param is negative integer.
– Tadeck
Nov 25 '11 at 18:59
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How do you read CSS rule values with JavaScript?
...lar rule, so I can't just pull them out by style name (like .style.width etc.)
16 Answers
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On Duplicate Key Update same as insert
...ackend app you're using for the same.
For LuaSQL, a conn:getlastautoid() fetches the value.
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How to handle configuration in Go [closed]
...s setting activated?", "what does it do?", "what are valid values for it?" etc).
– Darian Moody
Jan 22 '15 at 2:04
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Mapping a function on the values of a map in Clojure
...ure.walk/walk #(apply f %) identity m) )
Parellel versions – pmap-map, etc.
There are also parallel versions of these functions if you need them. They simply use pmap instead of map.
(defn pmap-map [f m]
(into (empty m) (pmap #(apply f %) m)) )
(defn pmap-map-keys [f m]
(pmap-map (fn [...
How to create a directory and give permission in single command
... 0777--since 777 only specifies the permissions, not the setuids, setgids, etc.)
Now, to apply this to your question in a broader sense--you have (already) got a few options. All the answers above work (at least according to my coreutils). But you may (or are pretty likely to) run into problems with...
java.lang.NoClassDefFoundError: Could not initialize class XXX
...likely the cause of the problem (maybe file can't be found, no permissions etc.).
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How to use sed/grep to extract text between two words?
...n the grep included in *BSD, or the ones that come with any SVR4 (Solaris, etc). In FreeBSD, you can install the devel/pcre port which includes pcregrep, which supports PCRE (and look-ahead/behind). Older versions of OSX used GNU grep, but in OSX Mavericks, -P is derived from FreeBSD's version, whi...
How to get a random number in Ruby
... @banister: wow, I was convinced that the new api (rand with range, bytes, etc...) was available directly through the Random object. rand with range will be in 1.9.3, and I'll make a feature request for bytes. I've edited my answer
– Marc-André Lafortune
Jun 2...