Custom Operators

Custom Operators can be defined in Header Files or in the header of a class file. Note that it is not possible to define custom operators anywhere else.
The following syntax is used to define a custom operator:
  1. 1.
    The type of operator
    • infix
    • prefix
    • postfix
  2. 2.
    The keyword operator
  3. 3.
    The symbol
  4. 4.
    An optional secondary symbol for ternary operators - only valid after infix operator
  5. 5.
    An optional list of additional comma-separated properties within curly braces. Allowed properties:
    • precedence followed by an integer literal
    • associativity followed by one of
      • none
      • left
      • right
prefix operator &
postfix operator ^
infix operators also need additional properties to be fully defined, namely a precedence value and an associativity type.
You can define these properties in curly brackets after the name of the operator:
infix operator +- { none, 120 }
// ^ associativity ^ precedence
It is optional, but recommended for clarity, to type out which property is being defined:
infix operator +- { associativity none, precedence 120 }
infix operator +- { associativity none, 120 }
infix operator +- { none, precedence 120 }
The order in which the properties are placed within the brackets does not matter. Duplicate properties are not permitted and will cause a diagnostic error.