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Cos Function (RT)

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XSharpLoadLibrary Function (RT)

Year Function (RT)

IsInstanceOf Function

Determine if an object is an instance of a class.

Namespace: XSharp.RT
Assembly: XSharp.RT (in XSharp.RT.dll) Version: 2.19

Syntax

Copy

 FUNCTION IsInstanceOf(
	oObject AS Object,
	symClassName AS STRING
) AS LOGIC

public static bool IsInstanceOf(
	Object oObject,
	string symClassName
)

Request Example View Source

Parameters

oObject: Type: Object
The object to check for.
symClassName: Type: String
A symbolic representation of the class.

Return Value

Type: Logic
TRUE if oObject is an instance of symClassName; otherwise, FALSE.

Remarks

An instance of an inherited class is also an instance of the original (super) class. However, an instance of a super class is not an instance of any of its inherited classes. IsInstanceOf() is similar to CheckInstanceOf() except that it does not generate an error message if the specified object is not an instance of the specified class.

Examples

These examples illustrates IsInstanceOf() on inherited classes:

Copy

 1CLASS Employee
 2    EXPORT name, age
 3CONSTRUCTOR(tName, tAge)
 4    name := tName
 5    age := tAge
 6END CLASS
 7CLASS Programmer INHERIT Employee
 8END CLASS
 9CLASS Assembler INHERIT Programmer
10END CLASS
11FUNCTION CheckArgument()
12    LOCAL x, y AS OBJECT
13    x := Employee{"John", "25"}
14    y := Assembler{"Bill", "30"}
15    ? IsInstanceOf(x, #Employee)        // TRUE
16    ? IsInstanceOf(x, #Programmer)        // FALSE
17    ? IsInstanceOf(x, #Assembler)        // FALSE
18    ? IsInstanceOf(y, #Employee)        // TRUE
19    ? IsInstanceOf(y, #Programmer)        // TRUE
20    ? IsInstanceOf(y, #Assembler)        // TRUE

Reference

Functions, Globals and Defines

XSharp.RT Namespace

CheckInstanceOf(Object, String)

IsInstanceOfUsual(Usual, String)