A OptimallyBuffered Filter or Device provides a way for the Iostreams library to determine the best size of buffer to allocate for it if the user doesn't explicitly specify a buffer size.
| O | - | A type which is a model of OptimallyBuffered | 
| o | - | Object of type O | 
| io | - | Alias for namespace boost::iostreams | 
| Expression | Expression Type | Semantics | 
|---|---|---|
|  | std::streamsize | Returns the size of buffer that should be allocated for oif the user has not explicitly specified a buffer size. | 
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Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)