[cfe-dev] Detecting an out-of-class defaulted method

[via cfe-dev]

That worked perfectly, thanks!
--paulr

> -----Original Message-----
> From: David Rector <davrecthreads at gmail.com>
> Sent: Wednesday, September 1, 2021 8:09 AM
> To: Robinson, Paul <paul.robinson at sony.com>
> Cc: cfe-dev at lists.llvm.org
> Subject: Re: [cfe-dev] Detecting an out-of-class defaulted method
> 
> 
> 
> > On Aug 31, 2021, at 6:16 PM, via cfe-dev <cfe-dev at lists.llvm.org> wrote:
> >
> > Clang AST novice here...
> >
> > I have a CXXMethodDecl*, and I'm trying to determine whether it is
> > (a) marked `= default` in the class declaration,
> > (b) not `= default` in the class declaration, but `= default` in
> >    the outside-the-class definition, or
> > (c) neither.
> >
> > Currently I'm doing this:
> >
> >  if (Method->isExplicitlyDefaulted()) {
> >    if (Method->isUserProvided())
> >      defaulted_out_of_class;
> >    else
> >      defaulted_in_class;
> >  } else
> >    not_defaulted;
> >
> > and I have a test case like
> >
> > class foo {
> >  foo() = default;
> >  ~foo();
> > };
> > foo::~foo() = default;
> >
> > The ctor is going through the defaulted_in_class path, but
> > the dtor is going through the not_defaulted path.
> >
> > I've tried `Method->getCanonicalDecl()` instead of just `Method`
> > but the results are the same.
> 
> The canonical decl has no meaning other than its uniqueness over its
> redecls; I believe it is always just the first declaration (even when that
> is, say, a friend declaration).
> 
> I would manually look through each redeclaration of `Method`, e.g.
> 
> ```
> for (auto Redecl : Method->redecls()) {
>   if (Redecl->isExplicitlyDefaulted()) {
>     if (Redecl->isOutOfLine())
>       return defaulted_out_of_class;
>     else
>       return defaulted_in_class;
>   }
> }
> return not_defaulted;
> ```