原因：

1.文檔不夠完善

2.熟悉程度不夠，學習曲線比較陡峭，直接用有可能失控

3.實現太過復雜，還需要mpl庫的支持

4.如果使用，iostreams將成為底層，整個項目都會對其依賴，有風險

5.說白了，還是能力不夠，不過了解了一些iostreams歸納出來的concepts也是非常有收貨。

6.網上的一句歸納：

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Device Concepts

The most important Device concepts are these:

• Device: Base for all Device concepts, provides associated character type and category.
• Source: Provides read-only access to a sequence of characters.
• Sink: Provides write-only access to a sequence of characters.
• BidirectionalDevice: Provides access to two separate sequences of characters, one for reading and the other for writing.
• SeekableDevice: Provides read-write access to a single sequence of characters, with a single repositionable read/write head.

Filter Concepts

The most important Filter concepts are these:

• Filter: Base for all Filter concepts, provides associated character type and category.
• InputFilter: Filters characters read from a Source.
• OutputFilter: Filters characters written to a Sink
• BidirectionalFilter: Filters two separate character sequences, one read from a Sink and the other written to a Sink.
• SeekableFilter: Filters a single characters sequence, controlled by a SeekableDevice, providing filtered input, output and random access with a single repositionable read/write head

Optional Behavior

Boost.Iostreams prvides several concepts corresponding to optional behavior that a Filter or Device might implement:

• Blocking: A Device which blocks when it receives a read or write request until all requested characters are available, or until the end of a stream is reached.
• Direct: A Device which provides access to its controlled sequences as regions of memory rather than via a socket-like interface.
• Closable: A Filter or Device which receives notifications immediately before a stream is closed.
• Flushable A Filter or Device which receives notifications when a stream is flushed.
• Localizable: A Filter or Device which receives notifications when the locale of a stream or stream buffer is set using basic_ios::imbue or basic_streambuf::pubimbue.
• Multi-Character: A Filter which provides access to its controlled sequences several characters at a time, via a socket-like interface.
• OptimallyBuffered A Filter or Device which will be fitted with a buffer of custom size if no buffer size is explicitly requested by the user.
• Peekable: A source which allows characters to be put back to the input sequence.
• Pipable: A Filter which can appear in pipelines.