2.17. Tuple

Tuples are a concise syntax to create nameless data structures:

tuple ::= tuple < element_list >
element_list ::= nameless_element_list | named_element_list
nameless_element_list ::= type | nameless_element_list ';' type
named_element_list := name : type | named_element_list ';' name : type

Two tuple declarations are the same if they have the same number of types, and their respective types are the same:

var a : tuple<int; float>
var b : tuple<i:int; f:float>
a = b

Tuple elements can be accessed via nameless fields, i.e. _ followed by the 0 base field index:

a._0 = 1
a._1 = 2.0

Named tuple elements can be accessed by name as well as via nameless field:

b.i = 1         // same as _0
b.f = 2.0       // same as _1
b._1 = 2.0      // _1 is also available

Tuples follow the same alignment rules as structures (see Structures).