Here is a list of all documented files with brief descriptions:

[detail level 12]

mpi
array.hpp	Provides an MPI broadcast and reduce for std::array
chunk.hpp	Provides utilities to distribute a range across MPI processes
communicator.hpp	Provides a C++ wrapper class for an MPI_Comm object
datatypes.hpp	Provides utilities to map C++ datatypes to MPI datatypes
environment.hpp	Provides an MPI environment for initializing and finalizing an MPI program
generic_communication.hpp	Provides generic implementations for a subset of collective MPI communications (broadcast, reduce, gather, scatter)
group.hpp	Provides a C++ wrapper class for an MPI_Group object
macros.hpp	Macros used in the mpi library
monitor.hpp	Provides a class for monitoring and communicating events across multiple processes
mpi.hpp	Includes all relevant mpi headers
operators.hpp	Provides utilities to map custom binary functions to MPI operators
pair.hpp	Provides an MPI broadcast and reduce for std::pair
ranges.hpp	Provides an MPI broadcast, reduce, scatter and gather for generic ranges
string.hpp	Provides an MPI broadcast and gather for std::string
utils.hpp	Provides general utilities related to MPI
vector.hpp	Provides an MPI broadcast, reduce, scatter and gather for std::vector
window.hpp	Provides a C++ wrapper class for an MPI_Win object