# 13.5. C++ Bindings for Collective Communication

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    namespace MPI {

`void Intracomm::Barrier() const
` `void Intracomm::Bcast(void* buffer, int count, const Datatype& datatype, int root) const
` `void Intracomm::Gather(const void* sendbuf, int sendcount, const Datatype& sendtype, void* recvbuf, int recvcount, const Datatype& recvtype, int root) const
` `void Intracomm::Gatherv(const void* sendbuf, int sendcount, const Datatype& sendtype, void* recvbuf, const int recvcounts[], const int displs[], const Datatype& recvtype, int root) const
` `void Intracomm::Scatter(const void* sendbuf, int sendcount, const Datatype& sendtype, void* recvbuf, int recvcount, const Datatype& recvtype, int root) const
` `void Intracomm::Scatterv(const void* sendbuf, const int sendcounts[], const int displs[], const Datatype& sendtype, void* recvbuf, int recvcount, const Datatype& recvtype, int root) const
` `void Intracomm::Allgather(const void* sendbuf, int sendcount, const Datatype& sendtype, void* recvbuf, int recvcount, const Datatype& recvtype) const
` `void Intracomm::Allgatherv(const void* sendbuf, int sendcount, const Datatype& sendtype, void* recvbuf, const int recvcounts[], const int displs[], const Datatype& recvtype) const
` `void Intracomm::Alltoall(const void* sendbuf, int sendcount, const Datatype& sendtype, void* recvbuf, int recvcount, const Datatype& recvtype) const
` `void Intracomm::Alltoallv(const void* sendbuf, const int sendcounts[], const int sdispls[], const Datatype& sendtype, void* recvbuf, const int recvcounts[], const int rdispls[], const Datatype& recvtype) const
` `void Intracomm::Reduce(const void* sendbuf, void* recvbuf, int count, const Datatype& datatype, const Op& op, int root) const
` `void Op::Init(User_function* function, bool commute)
` `void Op::Free()
` `void Intracomm::Allreduce(const void* sendbuf, void* recvbuf, int count, const Datatype& datatype, const Op& op) const
` `void Intracomm::Reduce_scatter(const void* sendbuf, void* recvbuf, int recvcounts[], const Datatype& datatype, const Op& op) const
` `void Intracomm::Scan(const void* sendbuf, void* recvbuf, int count, const Datatype& datatype, const Op& op) const
`

    };

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MPI-2.0 of July 18, 1997
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