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ABAP_RELEXP - Predicative Method Call
ABAP_SYNTAX ... meth( ... ) ...
What does it do? A predicative method call is a relational expression whose only operand is a functional method call meth( ... ). The result of the relational expression is true if the result of the functional method call is not initial and false if the result of the functional method call is initial. The data type of the result of the functional method call, that is, the return value of the called function method, is arbitrary. A check is made for the type-dependent initial value. A predicative method call, like any relational expression, can be a full logical expression or part of one. This means it can be specified as a condition in control statements and other statements, as an argument in Boolean functions or conditional expressions, or in combinations with Boolean operators.
Latest notes:
A predicative method call is a short form of the predicate expression: ... meth( ... ) IS NOT INITIAL ...
Predicate methods whose return value has the type abap_bool are particularly suitable for predicative method calls. Calling a predicate method in a predicative method call simulates the call of a method whose return value has the real Boolean data type that does not exist in ABAP.
As usual, the functional method call meth( ... ) can be specified as an individual method or as a method chaining. If the first method called is an instance method, the functional method call can be introduced as usual using the instance operator NEW or the casting operator CAST.
In addition to the dedicated predicate functions, predicative method calls are the only way of creating a relational expression using a single operand.
For other expressions or data objects, the full predicate expression IS INITIAL or a comparison must be used to check the initial value but this is not recommended for many expressions anyway. NON_V5_HINTS ABAP_HINT_END
ABAP_EXAMPLE_VX Exit of the program if no SAP GUI is available. The called method check from the class CL_DEMO_SAP_GUI is a predicate method. ABEXA 01210 ABAP_EXAMPLE_END
ABAP_EXAMPLE_V5 Here the predicative method call equals(...) is equivalent to num1 = num2. ABEXA 01709 ABAP_EXAMPLE_END
