Type Compatibility

Every type is compatible with itself. Two distinct types are compatible if they satisfy at least one of the following conditions.

  • They are both real types.
  • They are both integer types.
  • One type is a subrange of the other.
  • Both types are subranges of the same type.
  • Both are set types with compatible base types.
  • Both are packed-string types with the same number of characters.
  • One is a string type and the other is a string, packed-string, or Char type.
  • One type is Variant and the other is an integer, real, string, character, or Boolean type.
  • Both are class, class-reference, or interface types, and one type is derived from the other.
  • One type is PChar or PWideChar and the other is a zero-based character array of the form array [0..n] of PChar or PWideChar.
  • One type is Pointer (an untyped pointer) and the other is any pointer type.
  • Both types are (typed) pointers to the same type and the {$t+} compiler directive is in effect.
  • Both are procedural types with the same result type, the same number of parameters, and type-identity between parameters in corresponding positions.

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Project Management Made Easy

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