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Some people (including Guido van Rossum himself) have called this parameter-passing scheme "call by object reference". An object reference means a name, and the passed reference is an "alias", i.e. a copy of the reference to the same object, just as in C/C++. The object's value may be changed in the called function with the "alias", for example:
In a programming language, an evaluation strategy is a set of rules for evaluating expressions. [1] The term is often used to refer to the more specific notion of a parameter-passing strategy [2] that defines the kind of value that is passed to the function for each parameter (the binding strategy) [3] and whether to evaluate the parameters of a function call, and if so in what order (the ...
Since that reference is undefined, the message. The named reference $1 was invoked but never defined (see the help page). displays for both references. This can be very confusing, as the order of references in the list may not match the order used in the content. If {} is used and the |refs= parameter is missing or malformed.
The quote marks must be the standard, straight, double quotation marks ("); curly or other quotes will be parsed as part of the reference name. You may optionally provide reference names even when the reference name is not required. This makes later re-use of the sourced reference easier.
The named reference "$1" was defined multiple times with different content (see the help page). A list-defined reference with the name "$1" has been invoked, but is not defined in the <references> tag (see the help page). A <ref follow="…"> tag that is the continuation of a previous one can neither be named individually nor extended; Cite ...
An output parameter, also known as an out parameter or return parameter, is a parameter used for output, rather than the more usual use for input. Using call by reference parameters, or call by value parameters where the value is a reference, as output parameters is an idiom in some languages, notably C and C++, [ b ] while other languages have ...
In computer science, message passing is a technique for invoking behavior (i.e., running a program) on a computer.The invoking program sends a message to a process (which may be an actor or object) and relies on that process and its supporting infrastructure to then select and run some appropriate code.
In others, for example, Python, Rust, and Perl 5, the first parameter of an instance method is such a reference. It needs to be specified explicitly. It needs to be specified explicitly. In Python and Perl, the parameter need not necessarily be named this or self ; it can be named freely by the programmer like any other parameter.