Re: [boost] aligned_storage in unions

Subject: Re: [boost] aligned_storage in unions
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2010-09-17 11:20:18

AMDG

dherring_at_[hidden] wrote:
> While C++0x promises to change things (see draft spec section 9.5), 
> C++ currently does not allow unions to contain members having a 
> nontrivial constructor, operator=, or destructor.  This excludes 
> std::string, std::complex, structures containing either, etc.
>
> The "standard" workaround is to allocate your own memory and use 
> manual type casting.  Boost::aligned_storage can be used to maintain 
> proper alignment, but it cannot be placed inside a union due to the 
> default ctor, dtor, and noncopyable functions.  Thus I am forced to 
> use part of boost::detail.

Use boost::aligned_storage<...>::type which should be POD.

In Christ,
Steven Watanabe