Method lfun::`-()

Method `-

mixed `-(void|zero arg)

Description

Negation and left side subtraction/set difference callback.

This is used by `- . When called without an argument the result should be a new instance that represents the negation of this object, otherwise the result should be a new instance that represents the difference between this object and arg .

Note

It's assumed that this function is side-effect free.

See also

lfun::``-() , `-()