Re: Basics : many way to use a Procedure

[Lucretia <laguest9000@googlemail.com>]

On Friday, 11 December 2015 22:19:55 UTC, comicf...@gmail.com  wrote:
> Hello !
> 
> I'm seeing that some people use procedure with the sign " => " .
> What is it ? Any documentation about this ? 
> 
> A example =
> 
> Ada.Text_IO.Create (
>           File => Log_File,
>           Name => "my_log_file.txt",
>           Mode => Ada.Text_IO.Out_File);

It's called named parameter association. It allows you to change the order of the parameters passed to a function/procedure to one that makes reading easier or just your own preference.

> which is very similar to the prototype :
> 
>  procedure Open
>      (File : in out File_Type;
>       Mode : File_Mode;
>       Name : String;
>       Form : String := "");

For example, given the proper context clauses:

Open (Name => "hello.txt", File => My_File, Mode => In_File);

or you can use it partially, as in:

Open (My_File, Name => "hello.txt", Mode => In_File);

> Also , is it possible to apply this kind of writing  for this procedure ? =

You can apply it to all functions/procedures. 

Luke.