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Unique identifier. A unique identifier ( UID) is an identifier that is guaranteed to be unique among all identifiers used for those objects and for a specific purpose. [1] The concept was formalized early in the development of computer science and information systems. In general, it was associated with an atomic data type .
Universally unique identifier. A Universally Unique Identifier ( UUID) is a 128-bit label used for information in computer systems. The term Globally Unique Identifier ( GUID) is also used, mostly in Microsoft systems. [1] [2] When generated according to the standard methods, UUIDs are, for practical purposes, unique.
A namespace is a system of organizing names or identifiers to avoid ambiguity and confusion. In computer science, namespaces are used to group related entities, such as variables, functions, classes, or modules, under a common name. This article explains the concept and history of namespaces, as well as their applications and implementations in different programming languages and environments.
A Uniform Resource Identifier ( URI) is a unique sequence of characters that identifies an abstract or physical resource, [1] such as resources on a webpage, mail address, phone number, [2] books, real-world objects such as people and places, concepts. [3] URIs are used to identify anything described using the Resource Description Framework ...
Even though its name is unique, g() is still mangled: name mangling applies to all C++ symbols (except for those in an extern "C" {} block). Complex example. The mangled symbols in this example, in the comments below the respective identifier name, are those produced by the GNU GCC 3.x compilers, according to the IA-64 (Itanium) ABI:
Software versioning. Software versioning is the process of assigning either unique version names or unique version numbers to unique states of computer software. Within a given version number category (e.g., major or minor), these numbers are generally assigned in increasing order and correspond to new developments in the software.
Process identifier. In computing, the process identifier (a.k.a. process ID or PID) is a number used by most operating system kernels —such as those of Unix, macOS and Windows —to uniquely identify an active process. This number may be used as a parameter in various function calls, allowing processes to be manipulated, such as adjusting the ...
In computer programming, a magic number is any of the following: A unique value with unexplained meaning or multiple occurrences which could (preferably) be replaced with a named constant. A constant numerical or text value used to identify a file format or protocol; for files, see List of file signatures.