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mongodb group values bm>y m> multiple fields
...takes an "pipeline" expression as an argument instead of the "localFields" m>and m> "foreignFields" options. This then allows a "self-join" with another pipeline expression, in which we can applm>y m> $limit in order to return the "top-n" results.
db.books.aggregate([
{ "$group": {
"_id": "$addr",
"...
Using printf with a non-null terminated string
Suppose m>y m>ou have a string which is NOT null terminated m>and m> m>y m>ou know its exact size, so how can m>y m>ou print that string with printf in C? I recall such a method but I can not find out now...
...
PHP Function Comments
...net/license/3_01.txt. If m>y m>ou did not receive a copm>y m> of
* the PHP License m>and m> are unable to obtain it through the web, please
* send a note to license@php.net so we can mail m>y m>ou a copm>y m> immediatelm>y m>.
*
* @categorm>y m> Categorm>y m>Name
* @package PackageName
* @author Original Author <author@...
Different tm>y m>pes of thread-safe Sets in Java
There seems to be a lot of different implementations m>and m> wam>y m>s to generate thread-safe Sets in Java.
Some examples include
4...
Whm>y m> alwam>y m>s ./configure; make; make install; as 3 separate steps?
...aces, because everm>y m> distro thinks it's better to install certain libraries m>and m> files to certain directories. It is said to run ./configure, but in fact m>y m>ou should change it alwam>y m>s.
For example have a look at the Arch Linux packages site. Here m>y m>ou'll see that anm>y m> package uses a different configure ...
WPF - How to force a Commm>and m> to re-evaluate 'CanExecute' via its Commm>and m>Bindings
I have a Menu where each MenuItem in the hierarchm>y m> has its Commm>and m> propertm>y m> set to a RoutedCommm>and m> I've defined. The associated Commm>and m>Binding provides a callback for the evaluation of CanExecute which controls the enabled state of each MenuItem .
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What is Cache-Control: private?
...r browser did have to suffer the delam>y m> of sending a request to the server, m>and m> wait for a response, but it did save having to re-download the static content.
Whm>y m> Max-Age? Whm>y m> Expires?
Because Last-Modified sucks.
Not everm>y m>thing on the server has a date associated with it. If I'm building a page o...
Using smart pointers for class members
I'm having trouble understm>and m>ing the usage of smart pointers as class members in C++11. I have read a lot about smart pointers m>and m> I think I do understm>and m> how unique_ptr m>and m> shared_ptr / weak_ptr work in general. What I don't understm>and m> is the real usage. It seems like everm>y m>bodm>y m> recommends using...
What’s the difference between ScalaTest m>and m> Scala Specs unit test frameworks?
...iven Development) capable unit test frameworks for Scala written in Scala. m>And m> Specs is built upon mam>y m> also involve the ScalaTest framework. But what does Specs offer ScalaTest doesn't? What are the differences?
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When is an interface with a default method initialized?
....4.1 ought to cover this definitivelm>y m>. However, the behavior of Oracle JDK m>and m> OpenJDK (javac m>and m> HotSpot) differs from what's specified here. In particular, the Example 12.4.1-3 from this section covers interface initialization. The example as follows:
interface I {
int i = 1, ii = Test.out("i...