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Subject: Re: [Boost-users] [Iostreams] Safely returning filtering_istream from function
From: Larry Evans (cppljevans_at_[hidden])
Date: 2013-06-06 07:37:09
On 06/05/13 07:37, Szymon Gatner wrote:
> Hi,
>
> I would like to return filtering_istream via
> std::unique_ptr<std::iostream> so that client code can just use iostream
> interface without knowing what is actual stream type.
>
> Inside the factory function filtering_istream is prepared with possible
> filters attached. Problem is filters are attached by reference.
Do you mean that the filter is passed to the filtering_istream CTOR
with a ref_wrapper, as described in item 1 of:
A filtering_stream may be constructed from an instance of a Filter
or Device type T which is not CopyConstructible in one of two ways:
* by using a reference wrapper, or
* if T is a standard stream or stream buffer type, by using the
constructor taking a non-const reference.
from:
http://www.boost.org/doc/libs/1_53_0/libs/iostreams/doc/classes/filtering_stream.html
?
[snip]
-regards,
Larry
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