"""
    fun = DIVAnd_pc_none(iB,H,R)

Dummy function for requiring that no preconditioner is used in DIVAnd.

See also: `diavnd_pc_sqrtiB`
"""
function DIVAnd_pc_none(iB, H, R)
    function fun!(x, fx)
        fx[:] = x
    end
    return fun!
end

# Copyright (C) 2014, 2017 Alexander Barth <a.barth@ulg.ac.be>
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# This program 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 General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, see <http://www.gnu.org/licenses/>.
