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From: Peter Simons (simons_at_[hidden])
Date: 2005-04-22 06:07:34

Iain Hanson writes:

>> async_read should not take a buffer; instead, the
>> callback should receive a pointer to a buffer managed by
>> the library that is guaranteed to be valid for the
>> duration of the callback. (Not by default, at least.)

>> async_write (by default) should not assume that the
>> passed buffer stays valid after async_write returns.

> This would give a significant performance hit as there
> will now be two copies of the data.

Not if the callback doesn't make any copies.


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