Re: [boost] Boost.Optional advantages

From: David Abrahams (dave_at_[hidden])
Date: 2005-07-11 16:25:51

Andrey Melnikov <melnikov_at_[hidden]> writes:

> David Abrahams wrote:
>> Andrey Melnikov <melnikov_at_[hidden]> writes:
>> 
>>>char bar_placeholder[sizeof(std::string];
>>>std::string *bar = reinterpret_cast<std::string*>(bar_placeholder);
>> 
>> 
>> reinterpret_cast is nonportable.
>
> Why? I don't see any reasons why reinterpert_cast from char [] to 
> std::string * could be nonportable. 

The standard says so.  It's implementation-defined.

<snip>

> I can't imagine how a compiler can avoid calling a non-trivial copy 
> constructor like in case of std::string. 

The standard says it can.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com