IDL_Object::_overloadMinusUnary

The IDL_Object::_overloadMinusUnary function method defines the behavior of the negation (unary -) operator for instances of objects that inherit from the IDL_Object class.

This method is designed to replicate the default behavior of objects that do not use operator overloading. As a result, object classes that do inherit from the IDL_Object class but that do not override this particular method will behave in the same manner as object classes that do not inherit from the IDL_Object class.

Tip: If you write an object class that inherits from IDL_Object and overloads this method, you can call the superclass method directly to achieve the default behavior for specific cases.

Syntax

In most cases, this method is called indirectly by specifying an object reference as an argument on the right side of the - operator. When called explicitly, the syntax is:

Result = Obj->[IDL_Object::]_overloadMinusUnary( )

Return Value

This method is called when the operand to the unary - operator is an instance of a class that inherits from the IDL_Object class, but that does not implement its own _overloadMinusUnary method. The return value replicates the behavior of the - operator with an object that does not inherit from the IDL_Object class.

Arguments

None

Keywords

None

Routine Signature

To overload the unary - operator for an object class, implement a method with the following signature:

FUNCTION class::_overloadMinusUnary

The return value of this function should be the result of the overloaded unary - operation.

Version History

8.0	Introduced