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In computer programming, initialization or initialisation is the assignment of an initial value for a data object or variable. The manner in which initialization is performed depends on the programming language , as well as the type, storage class, etc., of an object to be initialized.
In functional programming, assignment is discouraged in favor of single assignment, more commonly known as initialization. Single assignment is an example of name binding and differs from assignment as described in this article in that it can only be done once, usually when the variable is created; no subsequent reassignment is allowed.
The difference can be seen clearly in C++ when overloading assignment operator or creating copy constructor. I don't feel very confident though to rewrite this part. 78.128.196.3 12:24, 20 September 2013 (UTC) Initialization is one form of assignment, and the specific differences are explained in the Single assignment section.
In the C++ programming language, the assignment operator, =, is the operator used for assignment.Like most other operators in C++, it can be overloaded.. The copy assignment operator, often just called the "assignment operator", is a special case of assignment operator where the source (right-hand side) and destination (left-hand side) are of the same class type.
Every variable is assumed to have a definition in the context or scope. (In static single assignment form, use-define chains are explicit because each chain contains a single element.) For a variable, such as v, its declaration is identified as V (italic capital letter), and for short, its declaration is identified as .
So the above empty constructor will initialize value as the class definition states, but the constructor that takes an int will initialize it to the given parameter. It can also use constructor or uniform initialization, instead of the assignment initialization shown above.
Assignment: storage or transfer of data into a variable. Branches: ... Initialization of a variable or a nonconstant class member. Add one to branch count when:
The copy constructor is used only for initializations, and does not apply to assignments where the assignment operator is used instead. The implicit copy constructor of a class calls base copy constructors and copies its members by means appropriate to their type. If it is a class type, the copy constructor is called.