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What is the most effective way to get the index of an iterator of an std::vector?
I'm iterating over a vector and need the index the iterator is currently pointing at. AFAIK this can be done in two ways:
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Select multiple columns in data.table by their numeric indices
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No problem. Compare also dt[,"a"] and dt[,"a", with=FALSE] to see what a helpful option it really is.
– Josh O'Brien
Nov 14 '12 at 17:41
3
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Why am I getting “undefined reference to sqrt” error even though I include math.h header? [duplicate
I'm very new to C and I have this code:
5 Answers
5
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How do I sort an observable collection?
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Sorting an observable and returning the same object sorted can be done using an extension method. For larger collections watch out for the number of collection changed notifications.
I have updated my code to improve performance (thanks to nawfal)...
android fragment- How to save states of views in a fragment when another fragment is pushed on top o
In android, a fragment (say FragA ) gets added to the backstack and another fragment (say FragB ) comes to the top. Now on hitting back FragA comes to the top and the onCreateView() is called. Now I had FragA in a particular state before FragB got pushed on top of it.
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C++ equivalent of Java's toString?
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In C++ you can overload operator<< for ostream and your custom class:
class A {
public:
int i;
};
std::ostream& operator<<(std::ostream &strm, const A &a) {
return strm << "A(" << a.i << ")";
}
This way you can output instances ...
How to find the php.ini file used by the command line?
...d to enable pdo_mysql in my EasyPhp environment, so I went to php.ini file and uncommented the following line:
14 Answers
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How to determine the Boost version on a system?
...re it out manually (rather than in-code), the go to the include directory, and open up version.hpp. BOOST_VERSION takes a bit of deciphering, but BOOST_LIB_VERSION is pretty clear. The value of mine is currently "1_42"
– T.E.D.
Sep 14 '10 at 12:44
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server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
...ut it.
You need to check the web certificate used for your gitLab server, and add it to your </git_installation_folder>/bin/curl-ca-bundle.crt.
To check if at least the clone works without checking said certificate, you can set:
export GIT_SSL_NO_VERIFY=1
#or
git config --global http.sslver...
Set up a scheduled job?
I've been working on a web app using Django, and I'm curious if there is a way to schedule a job to run periodically.
24 A...