Re: [PATCH] make function_args_iterator a proper iterator

[Martin Sebor <msebor at gmail dot com>]

On 11/19/2018 03:48 AM, Eric Botcazou wrote:
> > Eventually, when GCC moves to more a recent C++ revision, it will
> > become possible to simplify the for loops to make use of the range
> > based for loop syntax along the lines of:
> >
> >    for (auto argtype: function_args (functype))
> >      {
> >        ...
> >      }
> >
> > Tested on x86_64-linux, and (lightly) on powerpc64le-linux using
> > a cross-compiler.  I'll test the changes to the other back ends
> > before committing.
>
> How does this interact with debugging?  Because, in my experience, the more
> you convert things to modernish C++, the less you can easily debug them...

There are no unexpected interactions that I'm aware of.  The C++
11 range for loop is just convenient syntax that the front end
"expands" to a conventional loop using ordinary iterators.  Calls
to the iterator members that implicitly take place can be stepped
into using the debugger just like any other functions.  In terms
of the user experience, I'd say the range for loop is pretty close
to a macro that expands to the use iterators.

Martin