Set (data type)

Sets

Sets are one of the complex data types supported by nyan. A set is a collection of elements that does not allow duplicates. It can hold an unlimited number of values.

Syntax

set_name : set(type) = {value1, value2, ..}

The contents of a set are surrounded by curly brackets ({}). Each value is seperated by a comma (,).

All values must be of the same data type specified with type.

Example

Building():
    creates : set(Unit)

Barracks(Building):
    creates = {Militia, Spearman}

The set creates has two entries: Militia and Spearman. Values inserted into the set must be of type Unit.

Operators

(Re-)Assignment '='

Building():
    creates : set(Unit)

Barracks(Building):
    creates = {Militia, Spearman}

Overwrites the old value with a new one.

Appending values '+='

Barracks(Building):
    creates = {Militia, Spearman}

MesoBarracks<Barracks>():
    creates += {EagleWarrior}

Inserts the given values into the set.

Removing values '-='

ArcheryRange(Building):
    creates = {Archer, Skirmisher, Genitour}

AllyLeaves<ArcheryRange>():
    creates -= {Genitour}

Removes every value that matches the values in the given set.

Keep only specified values '&='

ArcheryRange(Building):
    creates = {Archer, Skirmisher, CavalryArcher, HandCannoneer}

BackToFeudalAge<ArcheryRange>():
    creates &= {Archer, Skirmisher}

Removes every value that not matches the values in the given set.