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Using the tbb pipeline with the 3.0 syntax

I am trying to build a TBB pipeline with the new syntax as described in the tutorial, using tbb:filter_t as below
FILE *fd
tbb::filter_t f1( tbb::filter::serial_in_order,
MyInputFunc(fd) );
but it keeps throwing a compile error:
tbb40_20120201oss/include/tbb/pipeline.h:416: error: passing const MyInputFunc as this argument of TextSlice* MyInputFunc::operator()(tbb::interface6::flow_control&) discards qualifiers
It works fine with the inheritance based old filter API.
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