HB_IsNIL

HB_IsNIL()

Tests if the value returned by an expression is NIL.

Syntax

      HB_IsNIL( <expression> ) --> lIsNIL

Arguments

<expression> This is an expression of any data type

Return

The function returns .T. (true) if the value returned by <expression> is NIL, otherwise .F. (false) is returned.

Description

HB_IsNIL() is used to test if a variable contains the value NIL or if the result of an expression is of undefined data type. The function can be used as a replacement for the expression: Valtype(<expression>)==”U”.

Seealso

HB_IsArray(), HB_IsBlock(), HB_IsByRef(), HB_IsDate(), HB_IsHash(), HB_IsLogical(), HB_IsMemo(), HB_IsNull(), HB_IsNumeric(), HB_IsObject(), HB_IsPointer(), HB_IsString(), Type(), Valtype()

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