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utils.h
// Copyright (C) 2009-2010 Anders Logg
//
// This file is part of DOLFIN.
//
// DOLFIN is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// DOLFIN is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with DOLFIN. If not, see <http://www.gnu.org/licenses/>.
//
// Modified by Joachim B. Haga, 2012.
// Modified by Garth N. Wells, 2013.
//
// First added: 2009-08-09
// Last changed: 2013-01-03
#ifndef __DOLFIN_UTILS_H
#define __DOLFIN_UTILS_H
#include <cstring>
#include <limits>
#include <sstream>
#include <string>
#include <vector>
#include <boost/functional/hash.hpp>
#include <dolfin/common/MPI.h>
namespace dolfin
{
std::string indent(std::string block);
template<typename T>
std::string container_to_string(const T& x, std::string delimiter,
int precision, int linebreak=0)
{
std::stringstream s;
s.precision(precision);
if (!x.empty())
{
if (linebreak == 0)
{
s << *x.begin();
for (auto it = x.begin() + 1; it != x.end(); ++it)
s << delimiter << *it;
}
else
{
for (unsigned int i = 0 ; i != x.size(); ++i)
{
if ((i + 1)%linebreak == 0)
s << x[i] << std::endl;
else
s << x[i] << delimiter;
}
}
}
return s.str();
}
std::string to_string(const double* x, std::size_t n);
template <class T>
std::size_t hash_local(const T& x)
{
boost::hash<T> hash;
return hash(x);
}
template <class T>
std::size_t hash_global(const MPI_Comm mpi_comm, const T& x)
{
// Compute local hash
std::size_t local_hash = hash_local(x);
// Gather hash keys on root process
std::vector<std::size_t> all_hashes;
std::vector<std::size_t> local_hash_tmp(1, local_hash);
MPI::gather(mpi_comm, local_hash_tmp, all_hashes);
// Hash the received hash keys
boost::hash<std::vector<std::size_t>> hash;
std::size_t global_hash = hash(all_hashes);
// Broadcast hash key to all processes
MPI::broadcast(mpi_comm, global_hash);
return global_hash;
}
}
#endif
dolfin::MPI::broadcast
static void broadcast(MPI_Comm comm, std::vector< T > &value, unsigned int broadcaster=0)
Broadcast vector of value from broadcaster to all processes.
Definition MPI.h:320
dolfin::MPI::gather
static void gather(MPI_Comm comm, const std::vector< T > &in_values, std::vector< T > &out_values, unsigned int receiving_process=0)
Gather values on one process.
Definition MPI.h:598
dolfin
Definition adapt.h:30
dolfin::hash_global
std::size_t hash_global(const MPI_Comm mpi_comm, const T &x)
Definition utils.h:86
dolfin::container_to_string
std::string container_to_string(const T &x, std::string delimiter, int precision, int linebreak=0)
Definition utils.h:44
dolfin::to_string
std::string to_string(const double *x, std::size_t n)
Return string representation of given array.
Definition utils.cpp:42
dolfin::indent
std::string indent(std::string block)
Indent string block.
Definition utils.cpp:26
dolfin::hash_local
std::size_t hash_local(const T &x)
Return a hash of a given object.
Definition utils.h:76