Objective C Property Class
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Working with System Frameworks in Python and Objective-C
Working with System Frameworks in Python and Objective-C by James Barclay Feedback :) j.mp/psumac2015-62 2 Dude, Where’s My Source Code? CODE https://github.com/futureimperfect/psu-pyobjc-demo https://github.com/futureimperfect/PSUDemo SLIDES https://github.com/futureimperfect/slides 3 Dude, Where’s My Source Code? CODE https://github.com/futureimperfect/psu-pyobjc-demo https://github.com/futureimperfect/PSUDemo SLIDES https://github.com/futureimperfect/slides 3 Dude, Where’s My Source Code? CODE https://github.com/futureimperfect/psu-pyobjc-demo https://github.com/futureimperfect/PSUDemo SLIDES https://github.com/futureimperfect/slides 3 Agenda 1. What are system frameworks, and why should you care? 2. Brief overview of the frameworks, classes, and APIs that will be demonstrated. 3. Demo 1: PyObjC 4. Demo 2: Objective-C 5. Wrap up and questions. 4 What’s a System Framework? …and why should you care? (OS X) system frameworks provide interfaces you need to write software for the Mac. Many of these are useful for Mac admins creating: • scripts • GUI applications • command-line tools Learning about system frameworks will teach you more about OS X, which will probably make you a better admin. 5 Frameworks, Classes, and APIs oh my! Cocoa CoreFoundation • Foundation • CFPreferences - NSFileManager CoreGraphics - NSTask • Quartz - NSURLSession - NSUserDefaults • AppKit - NSApplication 6 CoreFoundation CoreFoundation is a C framework that knows about Objective-C objects. Some parts of CoreFoundation are written in Objective-C. • Other parts are written in C. CoreFoundation uses the CF class prefix, and it provides CFString, CFDictionary, CFPreferences, and the like. Some Objective-C objects are really CF types behind the scenes. -
Macspeechx.Py MODULE and ITS USE in an ACCELERATOR CONTROL SYSTEM Noboru Yamamoto*, J-PARC Cener, KEK and JAEA, Ibaraki, JAPAN
Proceedings of ICALEPCS2013, San Francisco, CA, USA TUPPC109 MacspeechX.py MODULE AND ITS USE IN AN ACCELERATOR CONTROL SYSTEM Noboru Yamamoto*, J-PARC cener, KEK and JAEA, Ibaraki, JAPAN Abstract With additional functionality such as user interface or macspeechX.py[1] is a Python module to accels speech selection of voices for specified UDP ports, this program synthesis library on MacOSX. This module have been can fit one or two pages of the paper used in the vocal alert system in KEKB[2] and J- While this system running without serious problem PARC[3] accelerator control system. Recent upgrade of until MacOSX came to the market. In Python on this module allow us to handle non-English lanugage, MacOSX does not includes macspeech.py as a its such as Japanese, through this module. Implementation components. It means we need to develop our own detail will be presented as an example of Python program solution before old Mac hardware would be replaced by accessing system library. new hardware which just runs MacOSX. SPEECH SYNTHESIS IN CONTROL In the next section, we will see several ways to write SYSTEMS Python module which bridges C/C++ library. In some control system, alerts to the operators can be sent as vocal messages. It used be require the special hardware or software to generate vocal message from computers in the system. When we started commissioning of KEKB accelerator, such an alert system was requested. We picked up: • speech synthesis library includes as one of standard libraries on Macintosh OS from Apple. • Macspeech.py module distributed as one of standard module with Python programming Langauge Figure 1: Software overview of KEKB/J-PARC vocal With these two components, we could build a very low alert system. -
Operator Overloading ______
Chapter 10: Operator Overloading _________________________________________________________________________________________________________ Consider the following C++ code snippet: vector<string> myVector(kNumStrings); for(vector<string>::iterator itr = myVector.begin(); itr != myVector.end(); ++itr) *itr += "Now longer!"; Here, we create a vector<string> of a certain size, then iterate over it concatenating “Now longer!” to each of the strings. Code like this is ubiquitous in C++, and initially does not appear all that exciting. However, let's take a closer look at how this code is structured. First, let's look at exactly what operations we're performing on the iterator: vector<string> myVector(kNumStrings); for(vector<string>::iterator itr = myVector.begin(); itr != myVector.end(); ++itr) *itr += "Now longer!"; In this simple piece of code, we're comparing the iterator against myVector.end() using the != operator, incrementing the iterator with the ++ operator, and dereferencing the iterator with the * operator. At a high level, this doesn't seem all that out of the ordinary, since STL iterators are designed to look like regular pointers and these operators are all well-defined on pointers. But the key thing to notice is that STL iterators aren't pointers, they're objects, and !=, *, and ++ aren't normally defined on objects. We can't write code like ++myVector or *myMap = 137, so why can these operations be applied to vector<string>::iterator? Similarly, notice how we're concatenating the string “Now longer!” onto the end of the string: vector<string> myVector(kNumStrings); for(vector<string>::iterator itr = myVector.begin(); itr != myVector.end(); ++itr) *itr += "Now longer!"; Despite the fact that string is an object, somehow C++ “knows” what it means to apply += to strings. -
Property Mapping: a Simple Technique for Mobile Robot Programming
Property Mapping: a simple technique for mobile robot programming Illah R. Nourbakhsh The Robotics Institute, Carnegie Mellon University Pittsburgh, PA 15213 [email protected] Abstract In this paper we present robot observability as a The mobile robot programming problem is a software predictor for diagnostic transparency. Then, we present a engineering challenge that is not easily conquered using language-independent technique called property mapping contemporary software engineering best practices. We for constructing robot programs that are diagnostically propose robot observability as a measure of the diagnostic transparent and thereby achieve high degrees of transparency of a situated robot program, then describe reliability. property mapping as a simple, language-independent approach to implementing reliable robot programs by maximizing robot observability. Examples from real- The Robot Programming Problem world, working robots are given in Lisp and Java. A mobile robot is a situated automata, or a module that comprises one part of a closed system together with the Introduction environment. Fig. 1 shows the standard depiction of a robot, with its outputs labeled as actions and the outputs The recent availability of inexpensive, reliable robot of the environment in turn labeled as percepts. chassis (e.g. ActivMedia Pioneer, IS-Robotics Magellan, Nomad Scout) has broadened the accessibility of mobile robotics research. Because these robots consist of fixed E hardware out-of-the-box, this technology is shifting the actions A P percepts emphasis of mobile robot research from a joint hardware and software design process toward hardware-unaware R mobile robot programming. This is a software design problem, and yet software Figure 1: The standard view of an embedded robot engineering best practices are not very helpful. -
Python for the C# Developer
{SDD} 2014 Software Design & Development Python for the C# developer Michael Kennedy @mkennedy http://blog.michaelckennedy.net Objectives • Introduce the basics of the Python language • Review what is awesome about C# and .NET • Explore Python's version of each C# / .NET feature DEVELOPMENTOR Michael Kennedy | @mkennedy | blog.michaelckennedy.net What is Python? • High-level programming language • Interpreted (sometimes JIT compiled) • Object-oriented (especially Python 3) • Strongly-typed with dynamic semantics • Syntax emphasizes readability • Supports modules and packages • Batteries included (large standard library [1]) DEVELOPMENTOR Michael Kennedy | @mkennedy | blog.michaelckennedy.net The ‘shape’ of a Python program • Python defines code blocks (known as suites in Python) using whitespace and colons. Things to note: def somemethod(name): • No semicolons if name == "Michael": print("Hi old friend") • Code blocks start with ‘:’ else: • Whitespace really really matters print("Nice to meet you") • There are no braces print("My name is … ") • There are no parentheses • Tabs are not your friend def main(): somemethod() Code suites DEVELOPMENTOR Michael Kennedy | @mkennedy | blog.michaelckennedy.net Python language demo DEVELOPMENTOR Michael Kennedy | @mkennedy | blog.michaelckennedy.net What's awesome about C# and .NET? System.Object: Everything is an object. LINQ IEnumerable + foreach loops Visual Studio / IDEs Class properties ( int Age {get; set;} ) Side-by-side execution (isolation) Anonymous types Iterator methods / yield return -
C++ Properties -- a Library Solution
Document Number: SC22/WG21/N1615=04-0055 Date: 2004-04-09 Author: Lois Goldthwaite Email: [email protected] C++ Properties -- a Library Solution N1600 is a summary of the "property" language extension that is proposed for C++/CLI. I can't help feeling that this is an effort to impose an alien idiom on C++. There is too much of "the compiler will perform black magic behind your back" in it. There are too many ways in which the programmer must be aware that some [pseudo-]data members must be handled in different ways from [real] data members. The C++/CLI draft spec (N1608)says in 8.8.4 and 18.4 that "A property is a member that behaves as if it were a field." I think "behaves" is absolutely the wrong word to use here. A property is behavior that pretends to be state. From an OO design point of view, I think this is A Bad Idea. Behaviour should be visible; state should not. Further on, the document continues, "the X and Y properties can be read and written as though they were fields. In the example above, the properties are used to implement data hiding within the class itself." The subtle advantage of "hiding" a private data member by treating it as a public data member escapes me. Properties are just syntactic saccharine for getter and setter member functions for individual fields. C++ experts have spent years trying to educate people NOT to use public data, to use member functions instead, and now we propose to introduce something that looks just like public data? Do we really want to try to teach people that public fields are still bad, but properties are good, even though they look just the same from outside the class? Moreover, these public fields have side effects! There is a danger that too many novice programmers will prototype their designs using public fields, with the intent of changing them to properties later, if and when it proves necessary, and the general quality of code will suffer because of it. -
Bleak Documentation Release 0.12.1
bleak Documentation Release 0.12.1 Henrik Blidh Jul 07, 2021 Contents 1 Features 3 1.1 Installation................................................3 1.2 Scan/Discover..............................................4 1.3 Usage...................................................6 1.4 Bleak backends..............................................6 1.5 Interfaces, exceptions and utils......................................8 1.6 Troubleshooting............................................. 24 1.7 Contributing............................................... 28 1.8 Credits.................................................. 29 1.9 Changelog................................................ 30 2 Indices and tables 43 Python Module Index 45 Index 47 i ii bleak Documentation, Release 0.12.1 Bleak is an acronym for Bluetooth Low Energy platform Agnostic Klient. • Free software: MIT license • Documentation: https://bleak.readthedocs.io. Bleak is a GATT client software, capable of connecting to BLE devices acting as GATT servers. It is designed to provide a asynchronous, cross-platform Python API to connect and communicate with e.g. sensors. Contents 1 bleak Documentation, Release 0.12.1 2 Contents CHAPTER 1 Features • Supports Windows 10, version 16299 (Fall Creators Update) or greater • Supports Linux distributions with BlueZ >= 5.43 (See Linux backend for more details) • OS X/macOS support via Core Bluetooth API, from at least OS X version 10.11 Bleak supports reading, writing and getting notifications from GATT servers, as well as a function for discovering BLE devices. Contents: 1.1 Installation 1.1.1 Stable release To install bleak, run this command in your terminal: $ pip install bleak This is the preferred method to install bleak, as it will always install the most recent stable release. If you don’t have pip installed, this Python installation guide can guide you through the process. 1.1.2 From sources The sources for bleak can be downloaded from the Github repo. -
Property Conveyances As a Programming Language
Property Conveyances as a Programming Language Shrutarshi Basu∗ Nate Foster James Grimmelmann Harvard University Cornell University Cornell Law School & Cornell Tech Cambridge, MA, USA Ithaca, NY, USA New York, NY, USA [email protected] [email protected] [email protected] Abstract 1 Introduction Anglo-American law enables property owners to split up Many legal issues depend on vague, open-ended standards. rights among multiple entities by breaking their ownership For example, nuisance law prohibits “unreasonable” interfer- apart into future interests that may evolve over time. The con- ence with neighbors’ use of land. What counts as “unreason- veyances that owners use to transfer and subdivide property able” depends on an eight-factor balancing test, and many of rights follow rigid syntactic conventions and are governed the individual factors are themselves vague and open-ended, by an intricate body of interlocking doctrines that determine including “the social value that the law attaches to the pri- their legal eect. These doctrines have been codied, but mary purpose of the conduct;” and “the suitability of the only in informal and potentially ambiguous ways. particular use or enjoyment invaded to the character of the This paper presents preliminary work in developing a locality.” [American Law Institute 1979] A lawyer who wants formal model for expressing and analyzing property con- to know whether a client’s cement plant will be considered veyances. We develop a domain-specic language capable a nuisance will have to research numerous previous cases, of expressing a wide range of conveyances in a syntax ap- gather extensive facts about the plant and its neighbors, and proximating natural language. -
Dealing with Properties
Dealing with Properties Martin Fowler [email protected] lmost every object you create needs properties: some statement about the object. A person may have a height, a company may have a CEO, a flight may have a flight Anumber. There are a number of ways to model properties. In this article I will explore some of these ways and when you may want to use them. I’ve often seen patterns touch on this subject, but they usually only cover part of the picture. Here I want to cover the issue more broadly to give a better discussion of the options. The most common, and the simplest case is to use a Fixed Property, that is just declare the attribute on the class. In the vast majority of cases that is all you need to do. Fixed properties begin to fail when you have a large amount of them, or you need to change them frequently, possibly at run time. These forces lead you to the varieties of Dynamic Property. All dynamic properties have the quality of a parameterized attribute where to query a property you need to use a query method with a parameter. The simplest of these is the Flexible Dynamic Property where the parameter is just a string. This makes it easy to define and use properties, but is difficult to control. If you need that control you can use a Defined Dynamic Property where your parameters must be instances of some class. A further step of control allows you to strongly type your dynamic property with a Typed Dynamic Property. -
Python Guide Documentation 0.0.1
Python Guide Documentation 0.0.1 Kenneth Reitz 2015 09 13 Contents 1 Getting Started 3 1.1 Picking an Interpreter..........................................3 1.2 Installing Python on Mac OS X.....................................5 1.3 Installing Python on Windows......................................6 1.4 Installing Python on Linux........................................7 2 Writing Great Code 9 2.1 Structuring Your Project.........................................9 2.2 Code Style................................................ 15 2.3 Reading Great Code........................................... 24 2.4 Documentation.............................................. 24 2.5 Testing Your Code............................................ 26 2.6 Common Gotchas............................................ 30 2.7 Choosing a License............................................ 33 3 Scenario Guide 35 3.1 Network Applications.......................................... 35 3.2 Web Applications............................................ 36 3.3 HTML Scraping............................................. 41 3.4 Command Line Applications....................................... 42 3.5 GUI Applications............................................. 43 3.6 Databases................................................. 45 3.7 Networking................................................ 45 3.8 Systems Administration......................................... 46 3.9 Continuous Integration.......................................... 49 3.10 Speed.................................................. -
Alice Glossary
Adventures in Alice Programming // Glossary of Useful Terms by Michael Marion // July 2012 Worlds, methods, functions, properties, variables - it’s pretty easy to get all of the terminology and concept matter confused when it comes to programming in Alice. To that point, we’ve developed this handy reference to use. Hopefully it helps you not to get mixed up. Enjoy! World A world in Alice encompasses everything. Just as we’d say that everyone and everything exists in our world in real life; every object, method, event, or anything else lies inside the world in Alice. The whole .a2w file represents the world. Object An object is just what it sounds like. Any sort of three-dimensional shape such as a person, animal, piece of furniture, building, or anything else of the sort in your world is an object. Most objects are added to the world via the Add Objects button, but some - the ground, camera, and light, for instance - are there by default. There are also two-dimensional objects such as text and billboards. Properties An object’s properties are also what they sound like. All objects have certain properties - whether or not they’re showing, their color, their position, and so forth. Color Defines the color of an object. There is a limited number of color choices in Alice, but it covers all primary colors and some extras, including red, blue, green, yellow, black, and cyan. To specify a white object, select “no color”. Opacity Defines the transparency of an object. Unlike isShowing, setting the opacity to a middle amount allows it to be only slightly transparent. -
Operator Overloading in C Sharp with Simple Example
Operator Overloading In C Sharp With Simple Example Clonic and thick-witted Stephan synopsize his lashkars violated commence laughably. Selig cosponsors his self-understanding refurbishes incompletely, but oculomotor Elias never supernaturalise so earthwards. Morning Robbie never spatted so ineptly or infract any instance detractingly. We will send you exclusive offers when we launch our new service. Even an instance of a class cannot access its private members. Overloading also has surprising ramifications. Net mvc with plus method overloading example overloads must have a simple examples and conceptual way they occur at times. The example with encapsulation comes in. Get in with implicit cast operator methods and examples of overloaded only overload resolution and commentary before. If a variety of ansi sql, if many various other. The example with it in a directional vector class methods in operations of examples of parameters, we avoid building reactive concurrent applications. It adds numbers, concatenates strings or delegates; indicates the sign of a number. In her sense, MATLAB can be used to rapidly prototype an algorithm. Operator specifies an object or two shift operator overloading and b are compiled for this website is only not change these arguments should be accessed from? The process four sections each implement one of different concrete classes. Calling a simple examples of creating an underscore followed if we can be completely new scheduling demands and meaningful. You can definitely overload Casting. This operator with operators, simple examples illustrate, most ad packages based off of operations. We offer such diverse selection of courses from leading universities and cultural institutions from around in world.