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Contents
OO ABAP – Narrowing and Widening Cast
Is it advisable to use up or down casting in ABAP?
So, it is advisable to always consider NARROWING CAST or WIDENING CAST terms and not to go with the UP or DOWN casting. Explore other ABAP Objects Concepts … CLASS_CONSTRUCTOR and CONSTRUCTOR: Who comes before whom?
What is narrowing cast in Java?
Assigning/copying the instance of sub class to super class instance is called Narrowing Cast. As shown in the figure, assigning sub class to super class is going up wards. From sub class (es) to super class while moving Up the path becomes narrow as shown in the left image. So I simply remember this. Narrowing cast = Up cast .
What is narrowing type casting in Java?
After that, the long type is converted into the float type. Converting a higher data type into a lower one is called narrowing type casting. It is also known as explicit conversion or casting up.
What is a narrowing cast?
A narrowing cast is a type cast that converts from a wider (larger) type to a smaller (narrower) type. The term “narrowing conversion” refers to the conversion that is performed by a narrowing type cast. If you need a more precise explanation of the relationship between the two, please read JLS 5.1, 5.5 and 15.6.
What is wide type cast in Java?
In Wide Type Cast, a narrower data type is converted to Broader data type. Wide Type Cast is also called Automatic Type Conversion. intVar1 is type-casted to float and this code sample does not produce any error. We can also do explicit Wide Type Cast as shown below:
What is narrowing or explicit conversion in Java?
As the name suggests Narrowing or Explicit conversion is not predefined conversion it is done by the programmer, not the compiler. If we want to assign a value of a larger data type to a smaller data type we perform explicit type casting or narrowing. This is useful for incompatible data types where automatic conversion cannot be done.
What is the defintion for narrowing cast?
If you see the ABAP Glossary in the Online help (F1 Help) you will see the below listed defintion for Narrowing Cast: Narrowing Cast. Also called Up Cast. Assignment between reference variables, where the static type of the target variables is more general than or the same as the static type of the source variables.
What is the difference between a narrowing cast and down cast?
According to the official ABAP documentation published by SAP e.g., a narrowing cast and a down cast are the same. They would also consider your example as an up cast, but as a widening cast, not a narrowing one.
What is narrow casting in Java?
When we assign the instance of the Subclass back to the instance of the Superclass, than it is called the “Narrow Casting”, because we are switching from a “More Specific view of an object” to “less specific view”. For example: we have a class a global class for ANIMAL.
What is widening type conversion and widening casting?
Widening Casting (smaller to larger type) Widening Type Conversion can happen if both types are compatible and the target type is larger than source type. Widening Casting takes place when two types are compatible and the target type is larger than the source type. Example1
What is widening and narrowing in C++?
Widening and Narrowing. Widening. Widening is taking place when a small primitive type value is automatically accommodated in a bigger/wider primitive data type. Widening is taking place when a reference variable of a subclass is automatically accommodated in the reference variable of its superclass.
Why widening cast is not working in LR_INTF?
In this case the widening cast will be failed since lr_intf is not of same type as lr_mine. We use widening cast mainly while dealing with interfaces and in case of dynamic programming. CREATE OBJECT lr_intf TYPE lcl_yourclass.
References:
ABAP Objects: Narrowing Cast – ABAP Help Blog
Narrowing cast and widening cast | SAP Community
Preview – OO ABAP: Narrowing and Widening Cast
Understanding Widening Cast in ABAP Objects | SAP Blogs
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Questions just answered:
Why widening cast is not working in LR_INTF?
Is it advisable to use up or down casting in ABAP?
What is narrowing type casting in Java?
What is a narrowing cast?
What is wide type cast in Java?
What is narrowing or explicit conversion in Java?
What is narrowing cast in Java?
What is the difference between a narrowing cast and down cast?
What is narrow casting in Java?
What is widening type conversion and widening casting?
What is widening and narrowing in C++?
What is the defintion for narrowing cast?
narrowing cast in abap
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