And how does it relate to compression? For example, a class for sending packets over a TCP socket is a concrete concept. An abstraction could be a Network interface with a send function. In the abstraction, we remove the details of exactly how the data is sent. Compression, on the other hand, is about hiding information.
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And how does it relate to compression? For example, a class for sending packets over a TCP socket is a concrete concept. An abstraction could be a Network interface with a send function. In the abstraction, we remove the details of exactly how the data is sent.
Compression, on the other hand, is about hiding information. Although not visible, the information is there and can be retrieved if necessary like unzipping compressed content. One example is procedural programming: Reading a function should give you a good picture of what the function does. If you need more information, you can always go into the called functions for details. No information is lost. Using an interface in object-oriented programming introduces an abstraction.
In runtime, in the general case, you cannot know which class implements an interface. You lose information.
This can make your object-oriented code hard to understand, review etc. Some may argue that this is not a problem: If your interfaces are clear, it does not matter who implements it. It should be sufficient to know that the subclass carries out the work according to the specification of the interface honoring the Liskov Substitution Principle. Still, the information loss can be a challenge.
The Network interface from above is a good example. It is on a higher level of abstraction than the more low-level TCP implementation which itself hides raw socket operations. What if we had a Network class with a send function, and it implementing the TCP socket sending. Is this an abstraction? The public functions of Network hides the details of TCP packet sending etc. By going into the Network class, we can retrieve all details of exactly how packets are sent.
Information is hidden, but not lost. Related posts: This entry was posted in Software Development and tagged abstraction , interface by Johnny. Bookmark the permalink. In fact, compression can be completely lossless. Compression is always in the presence of an encoding. Abstraction, on the other hand, is about selecting one set of data while ignoring other data, in the interest of giving a particular focus.
That loses information. I think you have it backwards.
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In Discourse on the Method , Descartes recalls, I entirely abandoned the study of letters. Resolving to seek no knowledge other than that of which could be found in myself or else in the great book of the world, I spent the rest of my youth traveling, visiting courts and armies, mixing with people of diverse temperaments and ranks, gathering various experiences, testing myself in the situations which fortune offered me, and at all times reflecting upon whatever came my way so as to derive some profit from it. Descartes, therefore, received much encouragement in Breda to advance his knowledge of mathematics. Together they worked on free fall , catenary , conic section , and fluid statics. Both believed that it was necessary to create a method that thoroughly linked mathematics and physics. While within, he had three dreams  and believed that a divine spirit revealed to him a new philosophy. However, it is likely that what Descartes considered to be his second dream was actually an episode of exploding head syndrome.
Martin Even bad code can function. Every year, countless hours and significant resources are lost because of poorly written code. Noted software expert Robert C. What kind of work will you be doing? More importantly, you will be challenged to reassess your professional values and your commitment to your craft.
Tusar As the name suggests, this is a practice whereby the last verse of a hymn tune will be accompanied on the organ with an alternative harmony supporting the melody, which remains unchanged. No music is given for the verses, but the standard tune comes from older liturgical books. A like service has been instituted in other cathedral and large The prima balalaika is the most common; the piccolo is rare. Wikipedia says this about Abstraction: I specialize in research papersbut have the skills eescant do all types of academic writing. The Physics of Software an investigation into the true nature of software. Alex Lemon born in is an American poet and memoirist. Alicia Silverstone ; born October 4,  is an American actress.
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It comprises representatives of patients and public, old age psychiatry, psychology, health services research and biostatistics, and works to an agreed Charter. It also acts as the independent Trial Steering Group. This trial has been adopted by the Swansea Trials Unit STU and will be conducted according to its standard operating procedures. The DMEC meets at least annually and reports to the PSC; the chair is a geriatrician with a particular interest in dementia, and their charter reflects established practice [ 12 ]. Design This is a multi-site, pragmatic randomised trial to evaluate the effectiveness and cost-effectiveness of memory aids delivered by Dementia Support Practitioners DSPs to people with early-stage dementia relative to treatment as usual TAU.