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XSharpLoadLibrary Function (RT)

Year Function (RT)

IsInstanceOfUsual Function

Determine if an object inside a USUAL is an instance of a class.

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

Syntax

Copy

 FUNCTION IsInstanceOfUsual(
	uObject AS USUAL,
	symClassName AS STRING
) AS LOGIC

public static bool IsInstanceOfUsual(
	Usual uObject,
	string symClassName
)

Request Example View Source

Parameters

uObject: Type: Usual
A USUAL type containing the object to check for.
symClassName: Type: String
A symbolic representation of the class.

Return Value

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

Remarks

IsInstanceOfUsual() is used to determine whether the polymorphic value uObject belongs to a class whose symbol is symClassName.
An instance of an inherited class is also an instance of the super class. However, an instance of a super class is not an instance of any of its inherited classes. IsInstanceOfUsual() is the same as the following: UsualType(uObject) = OBJECT .AND. IsInstanceOf(uObject, symClassName). Thus, it should be used instead of IsInstanceOf() in situations where it is not known whether a variable is an object. IsInstanceOfUsual()() is also 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

This example uses IsInstanceOfUsual() to check whether a USUAL variable is an object of a specific class:

Copy

1CLASS Cars
2    EXPORT Wheels
3LOCAL uMercedes
4uMercedes := Cars{}
5? IsInstanceOfUsual(uMercedes, #Cars)        // TRUE

Reference

Functions, Globals and Defines

XSharp.RT Namespace

CheckInstanceOf(Object, String)

IsInstanceOfUsual(Usual, String)