Re: [boost] [config] request for BOOST_NO_FWD_STD_DECLARATION

Subject: Re: [boost] [config] request for BOOST_NO_FWD_STD_DECLARATION
From: Felipe Magno de Almeida (felipe.m.almeida_at_[hidden])
Date: 2011-02-22 08:28:14

On Wed, Feb 16, 2011 at 12:49 PM, Mathias Gaunard
<mathias.gaunard_at_[hidden]> wrote:
> On 16/02/2011 13:52, Christopher Jefferson wrote:

[snip]

>> The question is then if forward declarations of types in std:: are
>> allowed. From 17.6.3.2.1p1 in the current C++0x draft (there is identical
>> text in the c++03 standard):
>>
>> "The behavior of a C++ program is undefined if it adds declarations or
>> definitions to namespace std or to a namespace within namespace std unless
>> otherwise specified."
>>
>> While people could read this in various ways, I would say it forbids these
>> kinds of games, although they might work for particular standard libraries.
>
> The standard also gives the reference of what the declarations of the
> classes of the standard library must be, and all those declarations are in
> namespace std.

Isn't the standard library allowed to add template parameters with defaults?

template <typename T, typename Allocator, typename _InternalParameter = int>
struct vector;

-- 
Felipe Magno de Almeida