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Optimising Android application before release [closed]
...xt(char[] text, int start, int len) variant. This isn't documented, and no one answered when I asked about it.
There are many ones like this. And this is one of the reasons why my app contains 50% native code (but there are other reasons).
Apart from this, I can recommend that you experiment with...
What is Ember RunLoop and how does it work?
...t bogged down with propagating changes compared to another framework (Backbone) that doesn't have a run loop: http://jsfiddle.net/jashkenas/CGSd5/ . Moral of the story: the RunLoop's really fast for most things you'd ever want to do in Ember, and it's where much of Ember's power lies, but if you fin...
How to concatenate twice with the C preprocessor and expand a macro as in “arg ## _ ## MACRO”?
...g operator ##?
Maybe, and maybe not — it depends on the preprocessor. One of the advantages of the standard preprocessor is that it has this facility which works reliably, whereas there were different implementations for pre-standard preprocessors. One requirement is that when the preprocessor...
Learning to write a compiler [closed]
...
I think one worth mentioning is Coursera's compilers course. It has nice videos and walks through creating a java like language / simple compiler. Coursera Compilers Link
– QuantumKarl
Feb 24 '1...
What's the best way to parse command line arguments? [closed]
...u are better off going with optparse over getopt. getopt is pretty much a one-to-one mapping of the standard getopt(3) C library functions, and not very easy to use.
optparse, while being a bit more verbose, is much better structured and simpler to extend later on.
Here's a typical line to add an...
C/C++ Struct vs Class
...fault to public in structs—a struct written like a C struct behaves like one.)
While it's possible to fake some OOP in C—for instance, defining functions which all take a pointer to a struct as their first parameter, or occasionally coercing structs with the same first few fields to be "sub/sup...
Uncaught ReferenceError: $ is not defined?
...ars later, still the answer is not "ticked" ) This articles describes this one and 4 more common cases when this error occurs.
– Uzbekjon
Feb 14 '13 at 9:46
...
round() for float in C++
...
There's no round() in the C++98 standard library. You can write one yourself though. The following is an implementation of round-half-up:
double round(double d)
{
return floor(d + 0.5);
}
The probable reason there is no round function in the C++98 standard library is that it can in f...
Creating a URL in the controller .NET MVC
... UrlHelper; there is a .Url property on the controller which will give you one with the correct RequestContext.
– Tobias J
Nov 14 '13 at 15:34
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Django filter queryset __in for *every* item in list
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Summary:
One option is, as suggested by jpic and sgallen in the comments, to add .filter() for each category. Each additional filter adds more joins, which should not be a problem for small set of categories.
There is the aggregation...