Operator OR (Inclusive Disjunction)


Returns the bitwise-or (inclusive disjunction) of two numeric values

Syntax:
declare operator Or ( byref lhs as T1, byref rhs as T2 ) as Ret

Usage:
result = lhs Or rhs

Parameters:
lhs
The left-hand side expression.
T1
Any numeric or boolean type.
rhs
The right-hand side expression.
T2
Any numeric or boolean type.
Ret
A numeric or boolean type (varies with T1 and T2).

Return Value:
Returns the bitwise-disjunction of the two operands.

Description:
This operator returns the bitwise-disjunction of its operands, a logical operation that results in a value with bits set depending on the bits of the operands (for conversion of a boolean to an integer, false or true boolean value becomes 0 or -1 integer value).

The truth table below demonstrates all combinations of a boolean-disjunction operation:

Lhs Bit Rhs Bit Result
0 0 0
1 0 1
0 1 1
1 1 1


No short-circuiting is performed - both expressions are always evaluated.

The return type depends on the types of values passed. Byte, Ubyte and floating-point type values are first converted to Integer. If the left and right-hand side types differ only in signedness, then the return type is the same as the left-hand side type (T1), otherwise, the larger of the two types is returned. Only if the left and right-hand side types are both Boolean, the return type is also Boolean.

This operator can be overloaded for user-defined types.

Examples:
' Using the OR operator on two numeric values
Dim As UByte numeric_value1, numeric_value2
numeric_value1 = 15 '00001111
numeric_value2 = 30 '00011110

'Result =  31  =     00011111      
Print numeric_value1 Or numeric_value2
Sleep


' Using the OR operator on two conditional expressions
Dim As UByte numeric_value
numeric_value = 10

If numeric_value = 5 Or numeric_value = 10 Then Print "Numeric_Value equals 5 or 10"
Sleep

' This will output "Numeric_Value equals 5 or 10" because
' while the first condition of the first IF statement is false, the second is true


Dialect Differences:
Differences from QB:
See also:
Back to Logical Operators
Back to Operators
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