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Version: 4.x

[] operator

The [] operator creates a property that returns an object from a structure.

Syntax​

expr [ number ]

Where [ and ] are ordinary square brackets.

Description​

The [] operator creates a property that takes a structure as input and returns one of the objects of this structure. Objects are accessed using the sequence number of the object.

Parameters​

  • expr

    An expression whose value must be a structure.

  • number

    The sequence number of an object. Integer literal. Must be within the range of [1..N], where N is the number of objects in the structure.

Examples​

CLASS Letter;
attachment1 = DATA FILE (Letter);
attachment2 = DATA FILE (Letter);
letterAttachments (Letter l) = STRUCT(attachment1(l), attachment2(l));
secondAttachment(Letter l) = letterAttachments(l)[2]; // returns attachment2