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map vs. hash_map in C++
I have a question with hash_map and map in C++. I understand that map is in STL, but hash_map is not a standard. What's the difference between the two?
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What is Gradle in Android Studio?
Gradle is a bit confusing to me, and also for any new Android developer. Can anyone explain what Gradle in Android Studio is and what its purpose is? Why is it included in Android Studio?
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How to recognize USB devices in Virtualbox running on a Linux host? [closed]
...without any success. It seems they are not detected by Virtualbox itself, since if I select the guest from the Virtualbox home (I'm using a Windows XP 3 guest), choose Settings -> USB -> Add filter from device, no devices is listed, even if an USB pen is attached and recognized by my Lubuntu 13.10. ...
What is the performance cost of having a virtual method in a C++ class?
Having at least one virtual method in a C++ class (or any of its parent classes) means that the class will have a virtual table, and every instance will have a virtual pointer.
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Last non-empty cell in a column
Does anyone know the formula to find the value of the last non-empty cell in a column, in Microsoft Excel?
23 Answers
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How to fix .pch file missing on build?
When I build my c++ solution in Visual Studio it complains that the xxxxx.pch file is missing. Is there a setting I am missing to get the pre-compiled headers back?
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How do I list one filename per output line in Linux?
I'm using ls -a command to get the file names in a directory, but the output is in a single line.
7 Answers
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Are HTTPS URLs encrypted?
Are all URLs encrypted when using TLS/SSL (HTTPS) encryption? I would like to know because I want all URL data to be hidden when using TLS/SSL (HTTPS).
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When is .then(success, fail) considered an antipattern for promises?
I had a look at the bluebird promise FAQ , in which it mentions that .then(success, fail) is an antipattern . I don't quite understand its explanation as for the try and catch.
What's wrong with this the following?
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How to ignore certain files in Git
... (by git add). Run git reset name_of_file to unstage the file and keep it. In case you want to also remove the given file from the repository (after pushing), use git rm --cached name_of_file.
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