FBWiki: KeyPgOpEqual

Operator = (Equal)

Compares two expressions for equality

Syntax:declare operator = ( byref lhs as byte, byref rhs as byte ) as integer declare operator = ( byref lhs as ubyte, byref rhs as ubyte ) as integer declare operator = ( byref lhs as short, byref rhs as short ) as integer declare operator = ( byref lhs as ushort, byref rhs as ushort ) as integer declare operator = ( byref lhs as integer, byref rhs as integer ) as integer declare operator = ( byref lhs as uinteger, byref rhs as uinteger ) as integer declare operator = ( byref lhs as longint, byref rhs as longint ) as integer declare operator = ( byref lhs as ulongint, byref rhs as ulongint ) as integer declare operator = ( byref lhs as string, byref rhs as string ) as integer declare operator = ( byref lhs as zstring, byref rhs as zstring ) as integer declare operator = ( byref lhs as wstring, byref rhs as wstring ) as integer declare operator = ( byref lhs as T, byref rhs as T ) as integer
Usage:result = lhs = rhs
Parameters:

lhs

The left-hand side expression to compare to.

rhs

The right-hand side expression to compare to.

T

Any pointer type.

Return Value:

Returns negative one (-1) if expressions are equal, or zero (0) if unequal.

Description:

Operator = (Equality) is a binary operator that compares two expressions for equality and returns the result - a boolean value in the form of an Integer: negative one (-1) for true and zero (0) for false. The arguments are not modified in any way.

This operator can be overloaded to accept user-defined types as well.

Operator = (Equality) should not be confused with initializations or assignments, both of which also use the "=" symbol.

Examples:

Dim i As Integer = 0 '' initialization: initialise i with a value of 0
i = 420 '' assignment: assign to i the value of 420

If (i = 69) Then '' equation: compare the equality of the value of i and 69
Print "serious error: i should equal 420"
End -1
End If

Operator <> (Inequality) is complement to Operator = (Equality), and is functionally identical when combined with Operator Not (Bit-wise Complement).

If (420 = 420) Then Print "(420 = 420) is true."
If Not (69 <> 69) Then Print "not (69 <> 69) is true."

Dialect Differences:

In the -lang qb dialect, this operator cannot be overloaded.

Differences from QB:

none

See also:

Operator <> (Inequality)
Operator = (Assignment)

Back to Relational Operators

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FBWiki : KeyPgOpEqual

Operator = (Equal)