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Detect if Android device has Internet connection
...uptime.
As Tony Cho also pointed out in this comment below, make sure you don't run this code on the main thread, otherwise you'll get a NetworkOnMainThread exception (in Android 3.0 or later). Use an AsyncTask or Runnable instead.
If you want to use google.com you should look at Jeshurun's modifi...
No serializer found for class org.hibernate.proxy.pojo.javassist.Javassist?
...d in some nested object, not only in the root entity you are fetching).
If do not need the object in JSON, annotate the getter of this field (or the field itself, if you do not need to accept incoming values either) with @JsonIgnore, for example:
// this field will not be serialized to/from JSON
...
Shell command to sum integers, one per line?
...
Bit of awk should do it?
awk '{s+=$1} END {print s}' mydatafile
Note: some versions of awk have some odd behaviours if you are going to be adding anything exceeding 2^31 (2147483647). See comments for more background. One suggestion is to ...
Adjust width and height of iframe to fit with content in it
...resizeIFrameToFitContent( iFrame ) {
iFrame.width = iFrame.contentWindow.document.body.scrollWidth;
iFrame.height = iFrame.contentWindow.document.body.scrollHeight;
}
window.addEventListener('DOMContentLoaded', function(e) {
var iFrame = document.getElementById( 'iFrame1' );
resi...
Is there a working C++ refactoring tool? [closed]
Does anybody know a fully featured refactoring tool for C++ that works reliably with large code bases (some 100.000 lines)?
...
How would one call std::forward on all arguments in a variadic function?
...t preprocessor meta-library to make a variadic template (using 2010 and it doesn't support them). My function uses rval references and std::forward to do perfect forwarding and it got me thinking...when C++0X comes out and I had a standard compiler I would do this with real variadic templates. Ho...
How to change the font on the TextView?
...cation can also be changed by defining it styles.xml The android developer documentation has a clear guide on this here
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How to get the first element of an array?
How do you get the first element from an array like this:
31 Answers
31
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How to create index on JSON field in Postgres?
In PostgreSQL 9.3 Beta 2 (?), how do I create an index on a JSON field? I tried it using the -> operator used for hstore but got the following error:
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What is “rvalue reference for *this”?
... -pedantic t.cpp
$ ./a.out
lvalue object
rvalue object
The whole thing is done to allow you to take advantage of the fact when the object the function is called on is an rvalue (unnamed temporary, for example). Take the following code as a further example:
struct test2{
std::unique_ptr<int[]&g...