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## Function operator-

boost::mpi::operator- — Computes the difference between two process groups.

## Synopsis

    BOOST_MPI_DECL group operator-(const group & g1, const group & g2);

## Description

This routine returns a new `group` that contains all processes that are in group `g1` but not in group `g2`, ordered in the same way as `g1`. Equivalent to `MPI_Group_difference`.