Re: [boost] Unnamed namespaces?

From: JOAQUIN LOPEZ MU?Z (joaquin_at_[hidden])
Date: 2007-06-14 17:16:04

----- Mensaje original -----
De: Eric Niebler <eric_at_[hidden]>
Fecha: Jueves, Junio 14, 2007 10:57 pm
Asunto: Re: [boost] Unnamed namespaces?
Para: boost_at_[hidden]

> David Abrahams wrote:
> > on Thu Jun 14 2007, Eric Niebler <eric-AT-boost-consulting.com> 
> wrote:> 
> >>    template<typename T> struct static_const
> >>    {
> >>      static T const value;
> >>    };
> >>
> >>    template<typename T>
> >>    T const static_const<T>::value = {};
> >>
> >>    struct placeholder {};
> >>
> >>    // This is *supposed* to be statically initialized but many
> >>    // compilers do dynamic initialization for it. :-(
> >>    placeholder const &_1 = static_const<placeholder>::value;
> > 
> > I thought it was just MSVC.  Any others?
> 
> Shoot, now I can't remember. How many did we test? Well, this much 
> is certain, there is at least one compiler that does dynamic 
> initialization 
> for it. :-/
> 
> I also seem to recall that there was still some question as to 
> whether the use of the reference violated the ODR, if the
> reference is not optimized away. I don't think we ever got an
> answer to that question.

Maybe the following is not relevant to the discussion, but I
recall a post by Anthony Williams which shows how to create
a _1-like global entity in an entirely ODR-abiding way:

http://lists.boost.org/Archives/boost/2006/07/108355.php

HTH,

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo