Operator EQV (Equivalence)


Returns the bitwise-and (equivalence) of two numeric values

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

Usage:
result = lhs Eqv 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-equivalence of the two operands.

Description:
This operator returns the bitwise-equivalence 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-equivalence operation:

Lhs Bit Rhs Bit Result
0 0 1
1 0 0
0 1 0
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:
Dim As UByte a = &b00110011
Dim As UByte b = &b01010101, c
c = a Eqv b '' c = &b10011001


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