Re: [RFA 3/3] Make extract_arg return a std::string

[Tom Tromey <tom@tromey.com>]

>>>>> "Simon" == Simon Marchi <simon.marchi@polymtl.ca> writes:

>> Change extract_arg to return a std::string and fix up all the users.
>> I think string is mildly better than unique_xmalloc_ptr<char>, when
>> possible, because it provides a more robust API.

Simon> I agree, for strings we allocate dynamically ourselves, it makes sense
Simon> to use std::string.  For dynamically allocated strings coming from
Simon> external APIs we use, then unique_xmalloc_ptr<char> make sense, since
Simon> it doesn't require doing a copy.  For things that are always
Simon> constant/literal strings, the const char *.

That's my thinking exactly.

It would be nice if string could adopt a unique_xmalloc_ptr.  or we
could make string-returning variants of a few functions like
tilde_expand.  On the callee side we could move to string_view in the
future.

Simon> It's a bit funny to refer to extract_arg when this function is also
Simon> named extract_arg.  What about: "A const-correct version of the
Simon> above." ?

I've made this change in patch #1.

I made the other changes in this patch.

Tom