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Virtual functions and performance - C++
...loop, so the additional overhead per call was 7 nanoseconds per function.
From this I conclude: yes, virtual functions are much slower than direct functions, and no, unless you're planning on calling them ten million times per second, it doesn't matter.
See also: comparison of the generated assemb...
How do I erase an element from std::vector by index?
...ents:
vector.erase( vector.begin() + 3, vector.begin() + 5 ); // Deleting from fourth element to sixth element
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How to enable CORS in AngularJs
...er you are making the request to has to implement CORS to grant JavaScript from your website access. Your JavaScript can't grant itself permission to access another website.
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Architecture for merging multiple user accounts together
...tifier is paired with a method for retrieving the relevant user identifier from that service, and that is how authentication is performed. For OpenID, we employ the same approach, except the method for authenticating is more generalized (because we can almost always perform the exact same protocol ...
Why is “final” not allowed in Java 8 interface methods?
...wed in this light. (Note too that class methods are going to be different from interface methods, no matter what the intent, by virtue of the fact that interface methods can be multiply inherited.)
The basic idea of a default method is: it is an interface method with a default implementation, and ...
Why is a C++ Vector called a Vector?
... The same word is used for (e.g.) insects that transmit disease, and comes from the same Latin root as "vehicle". So it's something that takes you from one place to another. Incidentally, the word "matrix" is also from Latin, meaning "womb".
– Artelius
Jun 23 '...
Merging between forks in GitHub
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You probably have a "remote" for each repository. You need to pull from the one remote and push to the other.
If you originally cloned from your fork, that remote will be called "origin". If you haven't added it already, you'll need to add the first person's repository as another remote:
g...
Set environment variables from file of key/value pairs
TL;DR: How do I export a set of key/value pairs from a text file into the shell environment?
33 Answers
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Checkout multiple git repos into same Jenkins workspace
...e Multiple SCM plugin could help with this issue but it is now deprecated. From the Multiple SCM plugin page: "Users should migrate to https://wiki.jenkins-ci.org/display/JENKINS/Pipeline+Plugin . Pipeline offers a better way of checking out of multiple SCMs, and is supported by the Jenkins core de...
What is std::promise?
...td::future is an asynchronous return object ("an object that reads results from a shared state") and a std::promise is an asynchronous provider ("an object that provides a result to a shared state") i.e. a promise is the thing that you set a result on, so that you can get it from the associated futu...