110 lines
2.9 KiB
C++
110 lines
2.9 KiB
C++
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/*
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Copyright 2016 Statoil ASA.
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This file is part of the Open Porous Media project (OPM).
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OPM is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OPM is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OPM. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define BOOST_TEST_DYN_LINK
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#define BOOST_TEST_MODULE FLOAT_CMP_TESTS
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#include <boost/test/unit_test.hpp>
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#include <stdexcept>
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#include <opm/common/util/numeric/cmp.hpp>
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using namespace Opm;
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/**
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Ahhh - the joys of comparing floating point numbers ....
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http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm
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*/
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BOOST_AUTO_TEST_CASE(TestSCalarcmp) {
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const double abs_epsilon = cmp::default_abs_epsilon;
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const double rel_epsilon = cmp::default_rel_epsilon;
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BOOST_CHECK( cmp::double_equal(1,1));
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BOOST_CHECK_EQUAL( false , cmp::double_equal(1,0));
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BOOST_CHECK_EQUAL( false , cmp::double_equal(0,1));
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BOOST_CHECK_EQUAL( false , cmp::double_equal(-1,1));
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double v1,v2;
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/* Should be equal: */
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{
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v1 = 0.0;
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v2 = 0.0;
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BOOST_CHECK( cmp::double_equal( v1 , v2));
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v1 = 1e-12;
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v2 = v1 + 0.5*abs_epsilon;
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BOOST_CHECK( cmp::double_equal( v1 , v2));
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v1 = 7.0;
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v2 = 7.0;
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BOOST_CHECK( cmp::double_equal( v1 , v2));
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v1 = -7.0;
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v2 = -7.0;
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BOOST_CHECK( cmp::double_equal( v1 , v2));
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v1 = 0;
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v2 = 0.5 * abs_epsilon;
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BOOST_CHECK( cmp::double_equal( v1 , v2));
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v1 = 1e7;
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v2 = 1e7 + 2*abs_epsilon;
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BOOST_CHECK( cmp::double_equal( v1 , v2 ));
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v1 = 1e7*(1 - abs_epsilon);
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v2 = 1e7*(1 + rel_epsilon);
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BOOST_CHECK( !cmp::double_equal( v1 , v2 ));
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v1 = 1e7*(1 + abs_epsilon);
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v2 = 1e7*(1 + rel_epsilon);
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BOOST_CHECK( cmp::double_equal( v1 , v2 ));
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}
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/* Should be different: */
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{
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v1 = 0;
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v2 = 1.5 * abs_epsilon;
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BOOST_CHECK( !cmp::double_equal( v1 , v2 ));
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v1 = 1e-8;
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v2 = v1 + 1.5*abs_epsilon;
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BOOST_CHECK( !cmp::double_equal( v1 , v2 ));
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v1 = 1;
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v2 = v1*(1 + 2*rel_epsilon + abs_epsilon);
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BOOST_CHECK( !cmp::double_equal( v1 , v2 ));
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v1 = 10;
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v2 = v1*(1 + 2*rel_epsilon + abs_epsilon);
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BOOST_CHECK( !cmp::double_equal( v1 , v2 ));
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v1 = 1e7;
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v2 = 1e7*(1 + 2*rel_epsilon + abs_epsilon);
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BOOST_CHECK( !cmp::double_equal( v1 , v2 ));
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}
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}
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