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Qu'est-ce (qui) est instance variables - définition
SIMPLE TYPE OF DATA DEDUPLICATION
Single Instance Store; Single instance store; Single Instance Storage; Single instance storage; Single instance; Single-instance; Singleinstance; Single instances; Single-instances; Singleinstances; Single instanced; Single-instanced; Singleinstanced; Single instance storing; Single-instance storing; Singleinstance storing; Single-instance store; Singleinstance store; Single instance stores; Single-instance stores; Singleinstance stores; Single instance stored; Single-instance stored; Singleinstance stored
instance variable
VARIABLE IN AN OBJECT THAT IS DEFINED BY ITS CLASS
<programming> In object-oriented programming, one of the
variables of a class template which may have a different
value for each object of that class. Instance variables
hold the state of an object.
(1998-01-16)
free variable
CLASSIFICATION OF VARIABLES IN A LOGIC FORMULA BASED ON WHETHER OR NOT THEY ARE INSIDE THE SCOPE OF A QUANTIFIER
Free variable; Bound variable; Variable binding operation; Variable-binding operation; Free variables; Bound variables; Unbound variable; Unbound variables; Variable-binding operator; Variable binding operator; Free and bound variables; Bound variable clash; Free and bound variable; Placeholder (computer programming); Free variables & bound variables; Free occurrence; Placeholder variable; Apparent variable
1. A variable referred to in a function, which is not an
argument of the function. In lambda-calculus, x is a {bound
variable} in the term M = x . T, and a free variable of T.
We say x is bound in M and free in T. If T contains a subterm
x . U then x is rebound in this term. This nested, inner
binding of x is said to "shadow" the outer binding.
Occurrences of x in U are free occurrences of the new x.
Variables bound at the top level of a program are technically
free variables within the terms to which they are bound but
are often treated specially because they can be compiled as
fixed addresses. Similarly, an identifier bound to a
recursive function is also technically a free variable within
its own body but is treated specially.
A closed term is one containing no free variables.
See also closure, lambda lifting, scope.
2. In logic, a variable which is not quantified (see
quantifier).
bound variable
CLASSIFICATION OF VARIABLES IN A LOGIC FORMULA BASED ON WHETHER OR NOT THEY ARE INSIDE THE SCOPE OF A QUANTIFIER
Free variable; Bound variable; Variable binding operation; Variable-binding operation; Free variables; Bound variables; Unbound variable; Unbound variables; Variable-binding operator; Variable binding operator; Free and bound variables; Bound variable clash; Free and bound variable; Placeholder (computer programming); Free variables & bound variables; Free occurrence; Placeholder variable; Apparent variable
1. A bound variable or formal argument in a function
definition is replaced by the actual argument when the
function is applied. In the lambda abstraction
x . M
x is the bound variable. However, x is a free variable of
the term M when M is considered on its own. M is the scope
of the binding of x.
2. In logic a bound variable is a quantified variable. See
quantifier.
Wikipédia
Single-instance storage
Single-instance storage (SIS) is a system's ability to take multiple copies of content and replace them by a single shared copy. It is a means to eliminate data duplication and to increase efficiency. SIS is frequently implemented in file systems, e-mail server software, data backup, and other storage-related computer software. Single-instance storage is a simple variant of data deduplication. While data deduplication may work at a segment or sub-block level, single-instance storage works at the whole-file level and eliminates redundant copies of entire files or e-mail messages.
