Re: Simplify _Rb_tree instantiation

[François Dumont <frs dot dumont at gmail dot com>]

On 25/05/2018 21:19, Ville Voutilainen wrote:
> On 25 May 2018 at 22:16, Jonathan Wakely <jwakely@redhat.com> wrote:
> > > Why is this patch removing _Compare() calls? That changes the
> > > initialization
> > > of _Compare from value-initialization to default-initialization, which
> > > is a breaking change.
> >
> > The _Rb_tree_key_compare base class will still value-initialize it:
> >
> >       _Rb_tree_key_compare()
> >       _GLIBCXX_NOEXCEPT_IF(
> >          is_nothrow_default_constructible<_Key_compare>::value)
> >       : _M_key_compare()
> >       { }
> Okay, no problem then.
Now applied, note that I eventually restored the explicit calls to 
_M_t() in the template iterator range constructors. We didn't talk about 
it and there is also such a call for the default constructors in 
pre-c++11 mode so I prefered to keep consistency.

François