Operator Orelse (Short Circuit Inclusive Disjunction)
Returns the short circuit-or (Inclusive Disjunction) of two numeric values
result = lhs OrElse rhs
lhs
Returns the short circuit-or (inclusive disjunction) of the two operands.
This operator evaluates the left hand side expression. If the result is nonzero, then -1 (true) is immediately returned. If the result is zero then the right hand side is evaluated, and the logical result from that is returned, returning -1 (true) for a nonzero value or 0 (false) for zero.
(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 short circuit-or operation, the '-' denotes that the operand is not evaluated.
Short-circuiting is performed - only expressions needed to calculate the result are evaluated.
The return type is almost always an Integer, of the value 0 or -1, denoting false and true respectively. Except if the left and right-hand side types are both Boolean, then the return type is also Boolean.
This operator cannot be overloaded for user-defined types.
Syntax
Usage
result = lhs OrElse rhs
Parameters
lhs
The left-hand side expression.
T1Any numeric or boolean type.
rhsThe right-hand side expression.
T2Any numeric or boolean type.
RetA numeric or boolean type (varies with T1 and T2).
Return Value
Returns the short circuit-or (inclusive disjunction) of the two operands.
Description
This operator evaluates the left hand side expression. If the result is nonzero, then -1 (true) is immediately returned. If the result is zero then the right hand side is evaluated, and the logical result from that is returned, returning -1 (true) for a nonzero value or 0 (false) for zero.
(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 short circuit-or operation, the '-' denotes that the operand is not evaluated.
| Lhs Value | Rhs Value | Result |
| 0 | 0 | 0 |
| 0 | nonzero | -1 |
| nonzero | - | -1 |
Short-circuiting is performed - only expressions needed to calculate the result are evaluated.
The return type is almost always an Integer, of the value 0 or -1, denoting false and true respectively. Except if the left and right-hand side types are both Boolean, then the return type is also Boolean.
This operator cannot be overloaded for user-defined types.
Example
' Using the ORELSE operator on two numeric values
Dim As Integer numeric_value1, numeric_value2
numeric_value1 = 15
numeric_value2 = 30
'Result = -1
Print numeric_value1 OrElse numeric_value2
Sleep
Dim As Integer numeric_value1, numeric_value2
numeric_value1 = 15
numeric_value2 = 30
'Result = -1
Print numeric_value1 OrElse numeric_value2
Sleep
Differences from QB
- This operator was not available in QB.
See also