The macros BOOST_IOSTREAMS_DEFAULT_DEVICE_BUFFER_SIZE, BOOST_IOSTREAMS_DEFAULT_FILTER_BUFFER_SIZE and BOOST_IOSTREAMS_DEFAULT_PBACK_BUFFER_SIZE can be used to configure the default sizes of buffers allocated by the Iostreams library when a Filter or Device is attached to a stream_buffer or stream, or when it is added to a chain.
The default values are subject to change in future versions of the Iostreams library.
<boost/iostreams/constants.hpp>#define BOOST_IOSTREAMS_DEFAULT_DEVICE_BUFFER_SIZE 4096 #define BOOST_IOSTREAMS_DEFAULT_FILTER_BUFFER_SIZE 128 #define BOOST_IOSTREAMS_DEFAULT_PBACK_BUFFER_SIZE 4
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