Not all categories have initial or terminal objects, as will be seen below. Directly from the definition, one can show however that if an initial object exists, then it is unique up to a unique isomorphism. The same is true for terminal objects. The automorphism group of an initial (or terminal) object I is trivial. Aut(I) = Hom(I,I) = { idI }. ...

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Initial object, Initial object - Properties, Initial object - Examples

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In Object-Oriented Programming (OOP), an instance of a program (i.e. a program running in a computer) is treated as a dynamic set of interacting objects. Objects in OOP extend the more general notion of objects described above to include a very specific kind of typing, which among other things allows for: data members that represent the data associated with the object. methods that access the data members in predefined ways. In the case of most objects, one can access the data members only through the meth ...

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Object computer science, Object computer science - Objects in Object-Oriented Programming

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We threw stones (direct object) We listened to the radio. (prepositional object) They advised him to open a shop. (non-prepositional indirect object) In inflected languages, objects may be marked using morphological case. In many languages, the patient of a ditransitive verb is marked in the same way as the single object of a monotransitive verb, and is called the direct object. The recipient has its own marking, and is called the indirect object. In L ...

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Object grammar, Object grammar - Types of object

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In the early 1980s, common software engineering practice was based on structured programming. Structured programming was implemented in order to help "break down" programs into smaller parts, primarily to make them easier to work on as they grew increasingly large. However, as the problems being solved grew in size, structured programming became less useful as more and more methods had to be written, leading ...

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Objective-C, Objective-C - History, Objective-C - Syntax, Objective-C - Messages, Objective-C - Interfaces and implementations, Objective-C - Protocols, Objective-C - Dynamic typing, Objective-C - Forwarding, Objective-C - Categories, Objective-C - Posing, Objective-C - Other features, Objective-C - Objective-C++, Objective-C - Today, Objective-C - Analysis of the language

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Objective-C today is often used in tandem with a fixed library of standard objects (often known as a "kit" or "framework"), such as OpenStep/Cocoa/GNUstep. These libraries often come with the operating system: the OPENSTEP libraries come with the OPENSTEP operating system and Cocoa comes with Mac OS X. One can however bypass the framework and inherit directly from the root object, Object, and create one's own functionality. The aforementioned libraries however implement NSObject, a more techno ...

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Objective-C, Objective-C - History, Objective-C - Syntax, Objective-C - Messages, Objective-C - Interfaces and implementations, Objective-C - Protocols, Objective-C - Dynamic typing, Objective-C - Forwarding, Objective-C - Categories, Objective-C - Posing, Objective-C - Other features, Objective-C - Objective-C++, Objective-C - Today, Objective-C - Analysis of the language

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Taking an "objective approach" may not always be relevant, particularly in cases where it is impossible to be objective either because the relevant facts and viewpoints necessary are lacking, or because it is the subjective opinion or response that happens to be important. Thus it is possible to take an "objective approach" inappropriately in situations which call for an expression of subjective thought or feeling. Sometimes it is argued that an objective approach is impossible because people will naturally take a partisan, self-inter ...

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Objective approach, Objective approach - Science, Objective approach - Politics, Objective approach - Criticism, Objective approach - Neutrality, Objective approach - Authority

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In most object-oriented languages, objects can be referred to using references. Some examples of such languages are Java, C++, and many scripting languages, such as Python and Ruby. In this case, it matters whether the state of object can vary when objects are shared via references. If an object is known to be immutable, it can be copied simply by making a copy of a reference to it instead of copying the entire object. Because a reference (typically only the size of a pointer) is usually much smaller than the object itself, this results in ...

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Immutable object, Immutable object - Background, Immutable object - Implementation, Immutable object - Example, Immutable object - Usage

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A scientist or politician may never be "neutral" (they may have a vested interest in particular theories or policies) but they might also take an objective approach in the sense of remaining open to alternative viewpoints and new evidence. In a rational discourse, such an "open-minded" stance is important, especially because it may not be known in advance which facts and arguments are truly relevant to resolving an issue. A "closed" stance would foreclose discussion and debate, usually on the assumption that the relevant ...

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Objective approach, Objective approach - Science, Objective approach - Politics, Objective approach - Criticism, Objective approach - Neutrality, Objective approach - Authority

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Object databases became a popular subject for academic researchers and start-up companies in the early 1990s. There have been a number of different approaches: some have tried to add the concept of persistence to existing or newly-designed programming languages, while others have tried to add object concepts such as encapsulation and inheritance to existing database concepts. Systems in the latter category, because they retained a declarative query language based on predicate calculus as a central component of the architecture, came to be referred to as object-relational databases ...

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Object database, Object database - Adoption of object databases, Object database - Technical features, Object database - Advantages and disadvantages, Object database - Standards, Object database - Commercial Vendors, Object database - Open source

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Let C be a category with binary products and let Y and Z be objects of C. The exponential object ZY can be defined as a universal morphism from the functor –×Y to Z. (The functor –×Y from C to C maps objects X to X×Y and morphisms φ to φ×idY). Explicitly, the definition is as follows. An object ZY, together with a morphism is an exponential object if for any object X and morphism g : (X×Y) → ZSee also:

Exponential object, Exponential object - Definition, Exponential object - Examples

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The concept of objectivity has always been somewhat ambiguous, and both journalists and the public tend to identify objectivity in its absence. Few journalists would make a claim to total neutrality or impartiality. However, most strive toward a certain modicum of detachment from their own personal biases in their news work. In Discovering the News (1978), sociologist Michael Schudson argues that "the belief in objectivity is a faith in 'facts,' a distrust in 'values,' and a commitment to their segregation." In the United States, an o ...

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Objectivity journalism, Objectivity journalism - Definitions, Objectivity journalism - Criticisms, Objectivity journalism - Alternatives, Objectivity journalism - History

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Objective-C is a very "thin" layer on top of C. Objective-C is a strict superset of C. That is, it is possible to compile any C program with an Objective-C compiler, which cannot be said of C++. Objective-C borrows its syntax from both C and Smalltalk. Most of the syntax, including the traditional function calls, is inherited from C, while the syntax for certain object-oriented features, including message-passing, was partially borrowed from Smalltalk. See also:

Objective-C, Objective-C - History, Objective-C - Syntax, Objective-C - Messages, Objective-C - Interfaces and implementations, Objective-C - Protocols, Objective-C - Dynamic typing, Objective-C - Forwarding, Objective-C - Categories, Objective-C - Posing, Objective-C - Other features, Objective-C - Objective-C++, Objective-C - Today, Objective-C - Analysis of the language

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In decisions affecting large numbers of people (such as in politics) ignoring relevant evidence or alternative interpretations could lead to policies which, although perhaps well-intentioned, have the opposite effect of what was really intended. In this context, it is often argued that although democracy might hamper swift, decisive action, it is nevertheless the best guarantee that all relevant facts and interpretations are included in the decision-making process, result ...

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Objective approach, Objective approach - Science, Objective approach - Politics, Objective approach - Criticism, Objective approach - Neutrality, Objective approach - Authority

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Immutability does not imply that the object as stored in the computer's memory is unwriteable. Rather, immutability is a compile-time construct that indicates what a programmer should do, not necessarily what she can do (for instance, by circumventing the type system or violating const correctness in C or C++). A technique which blends the advantages of mutable and immutable objects, and is supported directly in almost all modern hardware, is copy-on-write (COW). Using this technique, when a user asks the system to copy ...

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Immutable object, Immutable object - Background, Immutable object - Implementation, Immutable object - Example, Immutable object - Usage

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In the category of sets, the exponential object ZY is the set of all functions from Y to Z. The map is just the evaluation map which sends the pair (f, y) to f(y). For any map the map is the curried form of g: In the category of topological spaces, the exponential object ZY exists provided that Y< ...

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Exponential object, Exponential object - Definition, Exponential object - Examples

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This is an example of composition in C. typedef struct { int age; char *name; enum { male, female } sex; } Person; In this example, the primitive types int, char *, and enum {male, female} are combined to form the composite type of Person. Each object of type Person then "has an" age, name, and sex. If a Person type were instead created by subtyping, it might be a subtype of Object, and it could inherit some attributes ...

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Object composition, Object composition - Example, Object composition - Recursive composition, Object composition - Composition in various languages, Object composition - Aggregation, Object composition - UML

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Some argue that a more appropriate standard should be fairness and accuracy (as enshrined in the names of groups like Fairness and Accuracy in Reporting). Under this standard, taking sides on an issue would be permitted as long as the side taken was accurate and the other side was given a fair chance to respond. Many professionals believe that true objectivity in journalism is not possible and reporters must seek balance in their stories (giving all sides th ...

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Objectivity journalism, Objectivity journalism - Definitions, Objectivity journalism - Criticisms, Objectivity journalism - Alternatives, Objectivity journalism - History

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A typical use of a functor is in writing more intelligent callback functions. A callback in procedural languages, such as C, may be accomplished by using function pointers. However it can be difficult or awkward to pass state into or out of the callback function. This restriction also inhibits more dynamic behavior of the function. A functor solves those problems since the function is really a façade for a full object, thus it carries its own state. Most modern object-oriented languages such as C++, Java, and Python support the definition of func ...

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Function object, Function object - Description, Function object - Origins, Function object - Functors in C and C++, Function object - Functors in Java, Function object - Functors in Python, Function object - Functors in Lisp, Function object - Other meanings of functor

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Critics of this understanding of objectivity argue that it does a disservice to the public because it fails to attempt to find the truth. They also argue that the concept is near impossible to apply in practice -- newspapers inevitably take a point of view in deciding what stories to cover, which to feature on the front page, what sources they quote, and other things. Media critics such as Edward Herman and Noam Chomsky (1988) have described a propaganda model which they use to show how in practice such a notion of objectivity ends up heavily favoring the viewpoint of those in po ...

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Objectivity journalism, Objectivity journalism - Definitions, Objectivity journalism - Criticisms, Objectivity journalism - Alternatives, Objectivity journalism - History

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Aggregation differs from ordinary composition in that it does not imply ownership. In composition, when the owning object is destroyed, so are the contained objects. In aggregation, this is not necessarily true. For example, a university owns various departments (e.g., chemistry), and each department has a number of professors. If the university closes, the departments will no longer exist, but the professors in those departments will. Therefore, a University can be seen as a composition of departments, whereas departments have an aggregation of professors. Composition is usually implemented such that an ob ...

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Object composition, Object composition - Example, Object composition - Recursive composition, Object composition - Composition in various languages, Object composition - Aggregation, Object composition - UML

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In UML, composition is depicted as a filled diamond and a solid line. |Car|<#>-------->|Carburetor| class Car { public: virtual ~Car() {delete itsCarb;} private: Carburetor* itsCarb }; Aggregation is depicted as an open diamond and a solid line. |Node|<>-------->|Node| class Node { private: vector<Node*> itsNodes; }; ...

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Object composition, Object composition - Example, Object composition - Recursive composition, Object composition - Composition in various languages, Object composition - Aggregation, Object composition - UML

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