Name Rascal/Expressions/Values/Tuple

Synopsis Tuple values.

Syntax < Exp1, Exp2, ... >

Types

Exp1	Exp2	...	< Exp1, Exp2, ... >
T1	T2	...	tuple[T1, T2, ... ]

Details Concatenation Equal FieldSelection GreaterThan GreaterThanOrEqual LessThan LessThanOrEqual NotEqual Subscription

Description A tuple is a sequence of elements with the following properties:

• Each element in a tuple (may) have a different type.
• Each element of a tuple may have a label that can be used to select that element of the tuple.
• Each tuple is fixed-width, i.e., has the same number of elements.

Tuples are represented by the type tuple[T1 L1, T2 L2, ...], where T1, T2, ... are arbitrary types and L1, L2, ... are optional labels.

The following functions are provided for tuples:

• Concatenation: Concatenate two tuple values.
• Equal: Equality operator on tuple values.
• FieldSelection: Select a field from a tuple by its field name.
• GreaterThan: Greater than operator on tuple values.
• GreaterThanOrEqual: Greater than or equal operator on tuple values.
• LessThan: Less than operator on tuple values.
• LessThanOrEqual: Less than or equal operator on tuple values.
• NotEqual: Not equal operator on tuple values.
• Subscription: Retrieve a tuple field by its index position.

Examples

rascal>tuple[str first, str last, int age] P = <"Jo","Jones",35>;
tuple[str first,str last,int age]: <"Jo","Jones",35>
rascal>P.first;
str: "Jo"
rascal>P.first = "Bo";
tuple[str first,str last,int age]: <"Bo","Jones",35>

Questions

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