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Carsten Gräser authored
There's a bug in the current implementation of `Dune::Hybrid::Impl::Id`.
Trying to do 'perfect forwarding' using

  template<class T>
  constexpr decltype(auto) foo()(T&& x) {
    return std::forward<T>(x);
  }

leads to undefined behaviour if you pass an r-value
to the function. Then `decltype(auto)` would be
deduced to be an r-value reference such that in

  auto&& bar = foo(expression());

`bar` would be bound to a temporary which is no longer
alive because there's no lifetime prolongation. The correct
version is

  template<class T>
  constexpr T foo()(T&& x) {
    return std::forward<T>(x);
  }

When passed an r-value of the raw type `E` then `T` is
deduced to be `E` such that we move the temporary into
the new value `bar`. If we pass an l-value of the raw
type `E`, then `T` is deduced to be either `T&` or
`const T&` such that we properly return the reference.
f90c50ee
History

DUNE-library

DUNE, the Distributed and Unified Numerics Environment is a modular toolbox for solving partial differential equations with grid-based methods.

The main intention is to create slim interfaces allowing an efficient use of legacy and/or new libraries. Using C++ techniques DUNE allows one to use very different implementation of the same concept (i.e. grid, solver, ...) under a common interface with a very low overhead.

DUNE was designed with flexibility in mind. It supports easy discretization using methods, like Finite Elements, Finite Volume and also Finite Differences. Through separation of data structures DUNE allows fast Linear Algebra like provided in the ISTL module, or usage of external libraries like blas.

This package contains the basic DUNE common classes.

Dependencies

dune-common depends on the following software packages

  • pkg-config
  • GNU C, C++ >=5 these might also work: icc (C/C++) >= 16.0 Clang >= 3.8 The compiler has to support C++14.

The following software is recommended but optional:

  • MPI (either OpenMPI, lam, or mpich suffice)

For a full explanation of the DUNE installation process please read the installation notes. The following introduction is meant for the impatient.

License

The DUNE-library and headers are licensed under version 2 of the GNU General Public License, with the so-called "runtime exception", as follows:

As a special exception, you may use the DUNE source files as part of a software library or application without restriction. Specifically, if other files instantiate templates or use macros or inline functions from one or more of the DUNE source files, or you compile one or more of the DUNE source files and link them with other files to produce an executable, this does not by itself cause Athe resulting executable to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU General Public License.

This licence clones the one of the libstc++ library. For further implications of this library please see their licence page

See the file COPYING for full copying permissions.

Installation

Short installation instructions can be found in file INSTALL. For the full instructions please see here.

Links

  1. https://www.dune-project.org/doc/installation
  2. https://dune-project.org/releases/
  3. https://dune-project.org/buildsystem/
  4. http://gcc.gnu.org/onlinedocs/libstdc++/faq.html#faq.license