Re: String literals and wide_string literals - how?

[Adam Beneschan <adam@irvine.com>]

On Apr 20, 3:07 am, Gerd <Gerd...@t-online.de> wrote:
> Hi all,
>
> if I have a string, then I can write a literal simply by writing
> "abcd". But if I want write a wide_string literal, how do it?

Same way.  A string literal in quotes can be interpreted as a String,
a Wide_String, a Wide_Wide_String, or any user-defined string type,
depending on context.

> Assume I have two procedure of the form:
>
> procedure do_anything (s : string);
>
> procedure do_anything (w : wide_string);
>
> then
>
> do_anything ("abcd");
>
> would call the first one.

No, it wouldn't.  It would be illegal; since a string literal can be
interpreted as a String or a Wide_String depending on context, the
above is ambiguous because the compiler can't figure out which
do_anything you want.

You can use
      do_anything (String' ("abcd"));
      do_anything (Wide_String' ("abcd"));
to tell the compiler which one you want to call.  Or, since the two
procedures have parameters of different names:
      do_anything (S => "abcd");       -- calls the first one
      do_anything (W => "abcd");       -- calls the second one

> What would one write to call the second
> one?
>
> Is there something like the L"xxx" in C?

Thank God, no.

                                      -- Adam