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Why do we need a pure virtual destructor in C++?
...for a virtual destructor. But why do we need a pure virtual destructor? In one of the C++ articles, the author has mentioned that we use pure virtual destructor when we want to make a class abstract.
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How to clone all remote branches in Git?
...ve a master and a development branch, both pushed to GitHub . I've clone d, pull ed, and fetch ed, but I remain unable to get anything other than the master branch back.
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Unix command to prepend text to a file
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In one line and in the original text file! This is the correct simple answer. I suggest the additional new line \n echo -e "to be prepended\n$(cat text.txt)" > text.txt
– VincentPerrin.com
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Set Focus on EditText
...ost focus, a method is called, which checks the value of the EditText with one in the database. If the return-value of the method is true, a toast is shown and the focus should get back on the EditText again. The focus should always get back on the EditText and the keyboard should show, until the re...
Why always ./configure; make; make install; as 3 separate steps?
... Below is an example of a wrapper that lets you build the whole package in one step. But remember that each application has a different wrapper (actually these wrappers have a name like spec, PKGBUILD, etc.):
def setup:
... #use ./configure if autotools is used
def build:
... #use make if autotool...
Relative frequencies / proportions with dplyr
...he relative frequency of number of gears by am (automatic/manual) in one go with dplyr ?
8 Answers
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Select multiple images from android gallery
...ter) and thereby i don't want to use a custom adapter but just the vanilla one.
9 Answers
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What are the use-cases for Web Workers? [closed]
...nt to block your code editing whilst you’re using the app.
From Mozilla: One way workers are useful is to allow your code to perform processor-intensive calculations without blocking the user interface thread.
As a practical example, think of an app which has a large table of #s (this is real wo...
NPM cannot install dependencies - Attempt to unlock something which hasn't been locked
...pt to unlock XXX, which hasn't been locked" on all my dependences. Here's one of them:
9 Answers
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Gson custom seralizer for one variable (of many) in an object using TypeAdapter
...delegate = gson.getDelegateAdapter(this, type);
final TypeAdapter<JsonElement> elementAdapter = gson.getAdapter(JsonElement.class);
return new TypeAdapter<C>() {
@Override public void write(JsonWriter out, C value) throws IOException {
JsonElement tree = delegate.to...