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## Function template wait_any

boost::mpi::wait_any — Wait until any non-blocking request has completed.

## Synopsis

    // In header: <boost/mpi/nonblocking.hpp>

    template<typename ForwardIterator>
      std::pair< status, ForwardIterator >
      wait_any(ForwardIterator first, ForwardIterator last);

## Description

This routine takes in a set of requests stored in the iterator range ``[first,last) and waits until any of these requests has been completed. It provides functionality equivalent to `MPI_Waitany`.

Parameters: |
`first` | The iterator that denotes the beginning of the sequence of request objects.
`last` | The iterator that denotes the end of the sequence of request objects. This may not be equal to `first`.
Returns: | A pair containing the status object that corresponds to the completed operation and the iterator referencing the completed request.