One of the problems any developer will eventually have to resolve is one of latency; specifically, being able to retrieve and process data in a timely fashion. This issue can come in many guises but they generally manifest as needing to read data from a backing store that cannot deliver the high performance needed by the application. This can be a tricky problem to solve but the general method is to implement some form of caching. The remainder of this article will discuss one caching mechanism, called the LRU Cache.
Imaging you have a map and on that map you define a bunch of geo-locations; polygons, which are defined by their vertices as latitude and longitude co-ordinates. These geo-locations may overlap and may either be very big or very small (or in-between). The problem is to figure out, for any point on the map, which of these geo-locations bound it.
The C and C++ standards documents can be a bit of a beast to trawl through and quite often you’ll find yourself reading the same sentence a number of times trying to fathom out what it is actually saying. It’s just like when you read the EULA for a software product; lots of big words and long sentences that don’t actually seem to make a lot of sense.
The C++03 standard treats temporary types as r-values (types only meant to go on the right hand side of an assignment expression). As such, it is only possible to bind a temporary to a const reference type. This is a somewhat arbitrary and, often, frustrating rule. The original idea was that there would be no good reason to modify a temporary; however, it turns out that there are plenty of good reasons for doing so and this arbitrary restriction was just a nuisance that served no good cause.
Regular readers (do I actually have any, I wonder?) of my blog may be wondering why I’ve not posted any new content for the last few weeks. First off, let me apologise for this. Secondly, let me explain why: I’ve been busy… in my new job! That’s right, ladies and gentlemen, everyone’s favourite evil one has finally found himself employment again.
During my numerous years as a software engineer I have spent many an occasion developing solutions to combat Spam. This article introduces the origins of spam and then looks at a number of ways it can be detected.
In case you’ve never heard of it before, Boost is a set of peer reviewed libraries for C++. They provide a lot of features that are sorely missing from the standard C++ libraries and are probably the closest C++ developers have to a standard development toolkit. In fact, Boost is so useful that a number of the projects were included in the C++11 standard.