Detecting at compile time if a string is zero terminated

[Johannes Pfau]

Hi,
I'm currently writing a small wrapper layer for gettext. My current
getText template looks like this:

----------------------------------------------------
string getText()(string msgid, string domain = null, Category cat =
Category.Messages) {
    auto cmsg = toStringz(msgid);
    auto nmsg = dcgettext(domain ? toStringz(domain) : null,
              cmsg, cat);
    if(cmsg == nmsg)
        return msgid;
    else
    {
        string nstr = cast(string)nmsg[0 .. strlen(nmsg)];
        return nstr;
    }
}

string getText(string msgid, string domain = null, Category cat =
Category.Messages)() {
    auto nmsg = dcgettext(domain ? domain.ptr : null,
              msgid.ptr, cat);
    if(msgid.ptr == nmsg)
        return msgid;
    else
    {
        string nstr = cast(string)nmsg[0 .. strlen(nmsg)];
        return nstr;
    }
}
----------------------------------------------------

As string literals in D are zero terminated, there's no need
for the toStringz overhead. The overload taking compile time
parameters takes advantage of that. The code works and can be used like
this:
----------------------------------------------------
    writeln(getText!"Hello World!"); //no toStringz
    writeln(getText("Hello World!")); //toStringz
----------------------------------------------------

But if somehow possible I'd like to merge the templates so that there
is only one way to call getText and the fastest way is chosen
automatically.

Does anyone know how to do that?
-- 
Johannes Pfau
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