/usr/include/dolfin/common/utils.h is in libdolfin-dev 1.4.0+dfsg-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | // 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 <string>
#include <sstream>
#include <vector>
#include <boost/functional/hash.hpp>
#include <dolfin/common/MPI.h>
namespace dolfin
{
/// Indent string block
std::string indent(std::string block);
/// Return string representation of int
template <class T>
std::string to_string(T x)
{
std::stringstream s;
s << x;
return s.str();
}
/// Return string representation of given array
std::string to_string(const double* x, std::size_t n);
/// Return a hash of a given object
template <class T>
std::size_t hash_local(const T& x)
{
boost::hash<T> hash;
return hash(x);
}
/// Return a hash for a distributed (MPI) object. A hash is computed
/// on each process, and the hash of the std::vector of all local hash
/// keys is returned. This function is collective.
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;
}
/// Fast zero-fill of numeric vectors/blocks.
template <class T>
void zerofill(T* arr, std::size_t n)
{
if (std::numeric_limits<T>::is_integer || std::numeric_limits<T>::is_iec559)
std::memset(arr, 0, n*sizeof(T));
else
{
// should never happen in practice
std::fill_n(arr, n, T(0));
}
}
template <class T>
void zerofill(std::vector<T>& vec)
{ zerofill(&vec[0], vec.size()); }
}
#endif
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