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Checking Typing

When data objects are assigned to typed field symbols and when actual parameters are assigned to typed formal parameters of procedures, the system checks whether the data type of the assigned data object matches the typing of the field symbol or of the formal parameter.

Special rules apply to:

Note

When specifying data objects suitable for a typing, an assignment to a helper variable with a valid data type is often made. When methods are called, these types of helper variables can often be skipped by using a constructor expression in the position of an actual parameter.




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General Rules for Typing
Return Values of Functional Methods
Literals as Actual Parameters
Functions and Expressions as Actual Parameters