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From: "Zhu, Qun-Ying" <zhu.qunying@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Copy vector in Ada
Date: Fri, 02 Nov 2012 17:15:25 -0700
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Date: 2012-11-02T17:15:25-07:00
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Yannick Duchêne (Hibou57) wrote:
> Le Fri, 02 Nov 2012 23:03:05 +0100, Maciej Sobczak
> <see.my.homepage@gmail.com> a écrit:
>>> When the assignment operator
>>> would not be safe to use and/or would cost too much to the
>>> implementation
>>> to be made available safely, then Ada has well know way to exclude it
>>> from
>>> the interface: “limited type”.
>>
>> Similarly in C++ - if the assignment operator is too costly (or just
>> impossible) to implement, there is a way to ban it.
>
> Really? That's a hot news to me. At least at the time I used it (~
> 2000), there was nothing like that, while Ada already had limited types
> since long. And I'm not even sure there was a way to redefine the copy
> operation (may be this came in a later C++ definition release, or else I
> forgot) or anything like adjustments.
>

I think it is a C++11 feature.
[1] http://www.stroustrup.com/C++11FAQ.html#default
[2] http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm
[3] http://gcc.gnu.org/projects/cxx0x.html (seems have the feature since 
GCC 4.4)