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reference.language.category_methods_abstract.html Maven / Gradle / Ivy

    
    
    
    

    
    

    
    

    
    
    
    

    



    

        
Abstract methods
        
Prompto supports abstract methods, a special type of method, which must be overloaded.
            Abstract methods are resolved at runtime based on the actual type of the value.

        
Abstract methods are well suited when no actual behaviour can be determined for an argument type (such as the below Shape).
        
In the below example, we do not know how to print a shape, only how to print specific shape types.
        
In order to print a list of shapes without knowing their type, we use an abstract method.
        

            
        
        

        

        
Abstract methods as arguments
        
Abstract methods can also be used as arguments for other methods:
        

            
        
        
In the above example, we show how to pass both a value: Hello and a method: displayScreen to another method: someMethod.
        
The method: someMethod then invokes the method received as an argument, using the value also received as an argument.
        
The method caller is responsible for providing a non abstract method compatible with the argument's method type.
        
Please note that in the E dialect only, the Method: keyword is required to let Prompto decide whether to pass displayScreen
            directly as an argument, or to invoke it and pass the result. This is not required in O and M dialects, where method invocation requires parenthesis.