topic Re: Could not used the variable in the inline declaration in Application Development and Automation Discussions

Could not used the variable in the inline declaration

FredericGirod — Wed, 22 Jan 2020 06:51:47 GMT

I am trying to do a simple code like this one

loop at my_lines 
     reference into data(o_line).
  data(my_summ) = o_line->my_quantity + my_sum. 
endloop.

(the objective is not to do a simple sum, this is just an example)

but, I have an error "my_sum is unknown"

is it a real limitation of the inline declaration ?

Re: Could not used the variable in the inline declaration

maheshpalavalli — Wed, 22 Jan 2020 07:46:44 GMT

It looks like it is not possible, check the comment from horst.keller

https://blogs.sap.com/2013/05/23/abap-news-for-release-740-inline-declarations/#comment-349626

I couldn't understand the standard help terminology but I think they are talking about the same.

https://help.sap.com/doc/abapdocu_752_index_htm/7.52/en-US/index.htm?file=abendata_inline.htm

Just like the statement DATA, an inline declaration does not open a local context for the current statement block. An inline declaration for a variable can only be made once within a context and the variable cannot yet be declared there using DATA.

is this the same? that statement is super confusing for me 😄

Thanks,
Mahesh

Re: Could not used the variable in the inline declaration

Sandra_Rossi — Wed, 22 Jan 2020 08:32:58 GMT

Typo in your code (my_summ -> my_sum).

No other choice than doing it in two steps:

data(my_sum) = 0. 
loop at my_lines 
     reference into data(o_line).
  my_sum = o_line->my_quantity + my_sum. 
endloop.

Re: Could not used the variable in the inline declaration

FredericGirod — Wed, 22 Jan 2020 08:37:54 GMT

I think you have right with this sentence

Just like the statement DATA, an inline declaration does not open a local context for the current statement

even if when we used FOR ... IN ... the system do exactly the oposite

Re: Could not used the variable in the inline declaration

FredericGirod — Wed, 22 Jan 2020 08:39:39 GMT

sandra.rossi , yes I exactly do that. But ... I don't know why, but I did not like to use the DATA ... anymore. I try to avoid it as much as possible.

Re: Could not used the variable in the inline declaration

Sandra_Rossi — Wed, 22 Jan 2020 09:18:05 GMT

This sentence explains that DATA(xxx) is just like DATA, it's not a new notion of "local context for the current statement block" like in other programming languages (in a method the same variable can be different if declared in separate { ... } blocks), and consequently DATA(xxx) cannot be repeated in the same "context" (procedures, instances of classes, classes, and programs).

It's more this sentence:

The date type of the variable is determined by the operand type

The compiler tries to determine the type of "my_sum" based on the types of the Right-Hand Side, but there is a kind of recursive determination because "my_sum" also appears in the RHS.

Re: Could not used the variable in the inline declaration

maheshpalavalli — Thu, 23 Jan 2020 11:00:34 GMT

Thanks Sandra Rossi & frdric.girod for the explanation, even in other languages like javascript also this is not possible, as it makes sense that the LHS type is dependent on the RHS type, but it will be based on the total RHS value type, in this case it will be

data(dyn_variable) = (some value) + (dyn_variable(with undefined type)) => so an error.

Re: Could not used the variable in the inline declaration

matt — Thu, 23 Jan 2020 13:00:06 GMT

But you're not using DATA. You're using data(my_sum)=0.