Intrinsic Procedure __subtract__

'__subtract__' function

The __subtract__ function can be defined to allow additional types to be used with the subtract - operator.

func __subtract__(a $A, b $B) $C {

}

where $A, $B and $C are any valid types

Usage Example

import basics

struct SubtractionIsAlwaysFive ()

func __subtract__(_unused_a, _unused_b AdditionIsAlwaysFive) int {
    return 5
}

func main {
    x AdditionIsAlwaysFive
    
    printf("x - x = %d\n", x - x)
}

x - x = 5