Record Types

- 2.2.6.13 -

TMT Pascal Language Description

Pascal Language Structure

Types

Record Types

Record types are structures that contain components of different types. Each component of a record is called a field. Variant sections are parts of records can have multiple definitions. Record type are defined as follows:

  record
    Fieldlist
  end

where Fieldlist is defined as:

  [[Fixedpart] | [Fixedpart;] [Variantpart]];

where Fixedpart is:

  Field [; Field];

where Field is

  identifier [,identifier] : Identifiertype;

Variantpart is defined as follows:

case [identifier:] Typename of
  Variant
  [;Variant];

where Variant is:

  Caserange [,Caserange] : (Fieldlist);

where Caserange is:

  expression [..expression];

With a proper understanding of TMT Pascal record types, very powerful types can be defined. The following are examples of record types:

type
  Coordinate = record
    x, y: Integer;
  end;
  Values = record
        case Way: Boolean of
        True:  (RValue : Extended);
        False: (IValue : Longint);
    end;

To reference a field of a record specify the record variable followed by a period (.) followed by the field name. The following refers to the fields of Coordinate declared above:

  Coordinate.x
  Coordinate.y


Set Types	Table of Content	File Types

- 2.2.6.13 -