計算機(jī)外文翻譯--c++設(shè)計基本原理

1、1外文原文 外文原文The C++ Design RationaleC++ is designed to be an extensible platform for rapidly developing program analysis tools. Several features of C++ facilitate this: By convention, C++ written in lower case letters refe

2、rs just to the program that abstracts data from a C++ program. CIA++ written in capital letters refers to the system made of that abstractor and all of the tools that use the database it generates. Entities include les,

3、macros, types, functions and variables.Separation of Information Extraction and Presentation: The process of extracting information from a program and the process of presenting that information should be separate. This e

4、liminates the need for each C++ analysis tool to duplicate the parsing process and allows C++ tools to share the information and present it in different ways. A similar doctrine was developed in the Interlisp project. U

5、nfortunately, many C and C++ tools today still violate this basic principle. A Well-Conceived Conceptual Model: A conceptual model based on the entity-relationship model was designed to describe the entities, attributes,

6、 and relationships in C++ pro- grams. The model serves as an accurate high level specification for the contents of the program database. Relational Database: To support reuse, C++ stores abstracted information in the for

7、m of a relational database. This makes it possible for that information to be accessed by a wide variety of existing database query systems. Incremental Database Construction: C++ builds and maintains a program database

8、for large systems efficiently because it allows incremental updates of a database. When a set of C++ source les is updated, only that portion has to be reabstracted to update the database. These basic design principles g

9、ive tools based on C++ an advantage over many traditional development tools, which usually merge the information extraction and 3of the signal reflected by the target, is a direct measure of the distance D to be measured

10、. However , the laser signal is transmitted at the speed of light; therefore, a precise ranging requires, a change in the distance to target by fifteen centimeter corresponds to a change in time difference of only one na

11、nosecond.In the prior art，there are some methods to transform the measured values in order to obtain the required time resolution and calculate the time-of-flight. These methods ,either stretch or transform it into anoth

12、er measurable value such as a voltage, rely on a great quantity of precise electronic components, increase the complexity of the circuit. The accuracy of these methods is easily degraded by temperature affects. Methods o

13、f calculating the phase different between the electronic circuit more complicated and take a longer time to perform.Generally, a specific ranging method and apparatus limits the range and resolution obtainable therewith.

14、 That means, it is almost impossible to change them by just modifying a part of the circuit.Object-Orientation and C++C++ is just one of many programming languages in use today. Why are there so many languages? Why do ne

15、w ones appear every few years? Programming languages have evolved to help programmers ease the transition from design to implementation. The first programming languages were very dependent on the underlying machine archi

16、tecture. Writing programs at this level of detail is very cumbersome. Just as hardware engineers learned how to build computer systems out of other components, language designers also realized that programs could be writ

17、ten at a much higher level, thereby shielding the programmer from the details of the underlying machine. Why are there such a large number of high-level programming languages? There are languages for accessing large inve

18、ntory databases, formatting financial reports, controlling robots on the factory floor, processing lists, controlling satellites in real time, simulating a nuclear reactor, predicting changing atmospheric conditions, pla