Operator Let (Assign)
Indicates the assignment operator when overloading Operator = (Assignment)
{ Type | Class | Union | Enum } typename
End { Type | Class | Union }
Operator typename.Let ( [ ByRef | ByVal ] rhs As datatype )
lhs = rhs
typename
lhs
Let is used to overload the Operator = (Assignment) operator and to distinguish it from the comparison operator Operator = (Equal).
lhs = rhs will assign the rhs to lhs by invoking the Let operator procedure defined int typename.
Output:
Syntax
{ Type | Class | Union | Enum } typename
End { Type | Class | Union }
Operator typename.Let ( [ ByRef | ByVal ] rhs As datatype )
Usage
lhs = rhs
Parameters
typename
lhs
The variable to assign to.
rhsThe value to assign.
Description
Let is used to overload the Operator = (Assignment) operator and to distinguish it from the comparison operator Operator = (Equal).
lhs = rhs will assign the rhs to lhs by invoking the Let operator procedure defined int typename.
Example
Type T
x As Integer
y As Integer
Declare Operator Let( ByRef rhs As T )
End Type
Operator T.let( ByRef rhs As T )
x = rhs.x
y = rhs.y
End Operator
Dim a As T = ( 5, 7 )
Dim b As T
'' Do the assignment invoking the LET
'' operator procedure
b = a
Print "a.x = "; a.x
Print "a.y = "; a.y
Print
Print "b.x = "; b.x
Print "b.y = "; b.y
x As Integer
y As Integer
Declare Operator Let( ByRef rhs As T )
End Type
Operator T.let( ByRef rhs As T )
x = rhs.x
y = rhs.y
End Operator
Dim a As T = ( 5, 7 )
Dim b As T
'' Do the assignment invoking the LET
'' operator procedure
b = a
Print "a.x = "; a.x
Print "a.y = "; a.y
Print "b.x = "; b.x
Print "b.y = "; b.y
Output:
a.x = 5 a.y = 7 b.x = 5 b.y = 7
Dialect Differences
- In the -lang qb and -lang fblite dialects, this operator cannot be overloaded.
- In the -lang qb and -lang fblite dialects, an assignment expression can be preceded by the Let keyword.
Differences from QB
- None
See also
