Perl definitions beginning with O

Object - permalink - collapse

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An "instance" of a "class". Something that "knows" what user-defined type (class) it is, and what it can do because of what class it is. Your program can request an object to do things, but the object gets to decide whether it wants to do them or not. Some objects are more accommodating than others.
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Browse Related Terms: Attribute, bless, construct, constructor, indirect object, indirect object slot, Instance, instance variable, IO, operator overloading, stringification

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octal - permalink - collapse

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A number in base 8. Only the digits 0 through 7 are allowed. Octal constants in Perl start with 0, as in 013. See also the oct function.
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Browse Related Terms: Binary, Bit, Byte, dwimmer, Hexadecimal, nybble

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offset - permalink - collapse

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How many things you have to skip over when moving from the beginning of a string or array to a specific position within it. Thus, the minimum offset is zero, not one, because you don't skip anything to get to the first item.
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Browse Related Terms: array, element, integer, modulus, multidimensional array, pseudohash, slice, subscript

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one-liner - permalink - collapse

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An entire computer program crammed into one line of text.
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Browse Related Terms: comment, continuation, Line, newline, whitespace

open source software - permalink - collapse

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Programs for which the source code is freely available and freely redistributable, with no commercial strings attached. For a more detailed definition, see http://www.opensource.org/osd.html.
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Browse Related Terms: eclectic, freely available, freely redistributable, freeware, public domain

operand - permalink - collapse

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An "expression" that yields a "value" that an "operator" operates on. See also "precedence".
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Browse Related Terms: binary operator, circumfix operator, infix, postfix, prefix, relational operator, term, ternary, trinary, unary operator

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Operating System - permalink - collapse

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A special program that runs on the bare machine and hides the gory details of managing processes and devices. Usually used in a looser sense to indicate a particular culture of programming. The loose sense can be used at varying levels of specificity. At one extreme, you might say that all versions of Unix and Unix-lookalikes are the same operating system (upsetting many people, especially lawyers and other advocates). At the other extreme, you could say this particular version of this particular vendor's operating system is different from any other version of this or any other vendor's operating system. Perl is much more portable across operating systems than many other languages. See also "architecture" and "platform".
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Browse Related Terms: arithmetical operator, device, GID, grep, Group, man, POSIX, shebang, superuser

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Operator - permalink - collapse

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A gizmo that transforms some number of input values to some number of output values, often built into a language with a special syntax or symbol. A given operator may have specific expectations about what types of data you give as its arguments (operands) and what type of data you want back from it.
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Browse Related Terms: C, data type, polymorphism, SV, type, type casting, typed lexical, typedef

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operator overloading - permalink - collapse

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A kind of "overloading" that you can do on built-in operators to make them work on objects as if the objects were ordinary scalar values, but with the actual semantics supplied by the object class. This is set up with the overload "pragma".
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Browse Related Terms: Attribute, bless, construct, constructor, indirect object, indirect object slot, Instance, instance variable, IO, Object, stringification

options - permalink - collapse

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See either switches or "regular expression modifier".
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Browse Related Terms: bareword, cloister, lvaluable, lvalue modifier, modifier, regular expression modifier

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overloading - permalink - collapse

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Giving additional meanings to a symbol or construct. Actually, all languages do overloading to one extent or another, since people are good at figuring out things from "context".
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Browse Related Terms: array context, Boolean, Boolean context, conditional, context, false, list context, numeric context, scalar context, string context, TMTOWTDI, void context

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overriding - permalink - collapse

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Hiding or invalidating some other definition of the same name. (Not to be confused with "overloading", which adds definitions that must be disambiguated some other way.) To confuse the issue further, we use the word with two overloaded definitions: to describe how you can define your own "subroutine" to hide a built-in "function" of the same name (see "Overriding Built-in Functions" in perlsub) and to describe how you can define a replacement "method" in a "derived class" to hide a "base class"'s method of the same name (see perlobj).
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Browse Related Terms: base class, derived class, empty subclass test, Inheritance, is-a, multiple inheritance, parent class, single inheritance, subclass, superclass, Tie

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Owner - permalink - collapse

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The one user (apart from the superuser) who has absolute control over a "file". A file may also have a "group" of users who may exercise joint ownership if the real owner permits it. See "permission bits".
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Browse Related Terms: bit string, execute bit, JAPH, permission bits, readable, setgid, setuid, umask

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ExpertGlossary

Object - permalink - collapse

octal - permalink - collapse

offset - permalink - collapse

one-liner - permalink - collapse

open source software - permalink - collapse

operand - permalink - collapse

Operating System - permalink - collapse

Operator - permalink - collapse

operator overloading - permalink - collapse

options - permalink - collapse

overloading - permalink - collapse

overriding - permalink - collapse

Owner - permalink - collapse

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