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As well as disabling operators, we can override them with the overload pragmatic module. This implements an object-oriented technique called overloading, where additional meanings are layered over an operator. The overloaded meanings come into effect whenever an object that defines an overloaded operator is used as an operand of that operator. For example, consider a module that implements an object class called MyObject that starts with the following lines: package MyObject; use overload '+' => &myadd, '-' => &mysub; ... Normally we cannot add or subtract objects because they are just references, and Perl does not allow us to perform arithmetic on references. However, if we try to perform an addition or subtraction involving objects of type MyObject, then the myadd and mysub methods in the MyObject package are called instead of Perl simply returning an error. This forms the basis of operator overloading for objects. Since overloading is fundamentally tied to object-oriented programming, we will not cover it further here. Overloading and the overload module are both covered in detail in 19.

One of the best examples of how class members can replace built-in functions is found with strings. In the past, every language has defined its own specialized functions for string manipulation. In .NET, however, you use the methods of the String class, which ensures consistency between all .NET languages. The following code snippet shows several ways to manipulate a string using its object nature: string myString = "This is a test string myString = myString.Trim(); myString = myString.Substring(0, 4); myString = myString.ToUpper(); myString = myString.Replace("IS", "AT"); int length = myString.Length; // // // // = = = = "; "This is a test string" "This" "THIS" "THAT"

Perl provides operators, like +, and it also has built-in functions, like abs. The distinction is apparently simple. Operators have an algebraic look and operate on operands. Functions take arguments,

// = 4

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s Note Though it s called Language-Integrated Query, LINQ can be used to update database data. We ll

are referenced by name rather than a symbol, and use parentheses to group arguments together Furthermore, operators are documented in the perlop manual page, and functions are in the perlfunc manual page Simple However, it is actually not that simple A character like + is clearly an operator because it is the universal symbol for addition, and addition is a mathematical operation Additionally, in its binary form, + takes an operand on each side, something a function never does So these cases are unambiguous Conversely, abs is clearly a function because it has a name rather than being a piece of punctuation But there are plenty of less obvious cases Many functions are called operators simply because they resemble operators The file test functions -f, -d, -l and so on, also known as the -X operators, are one example The readline operator, <>, is another.

The first few statements use built-in methods, such as Trim(), Substring(), ToUpper(), and Replace(). These methods generate new strings, and each of these statements replaces the current myString with the new string object. The final statement uses a built-in Length property, which returns an integer that represents the number of characters in the string.

The -X operators are an example of a named unary operator, an operator that has a name rather than a symbol and takes a single operand on its right They resemble unary operators like not, which also has a name and takes a single operand on its right So, the distinction between operators and functions is more vague than we might at first think They also appear in both the perlop and perlfunc manual pages, just to keep things nicely ambiguous An alternative way to look at functions is to say that they are all either named unary operators (accepting a single argument) or named list operators (accepting a list of arguments), in either case on the right This might seem arcane from a C programmer s perspective, but is quite familiar to anyone with experience with Lisp or any of its descendants, Perl included.

How we talk about them then becomes a matter of how we use them: if we use parentheses, they are functions, and if we do not, they are (or at least, resemble) operators print -e($filename); print -e $filename; # file test '-e', functional style # file test '-e', operator style.

Tip A method is just a procedure that s hardwired into an object. A property is similar to a variable it s a way

only cover simple queries here, to give you your first taste of LINQ, but LINQ is a general-purpose facility for accessing data. In many respects, it s the future of ADO.NET. For a concise but comprehensive introduction to LINQ, see Fabio Claudio Ferracchiati s LINQ for Visual C# 2005 (Apress, 2006).

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