basic.cpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.dev>
 *     Vincent Barichard <Vincent.Barichard@univ-angers.fr>
 *
 *  Copyright:
 *     Christian Schulte, 2005
 *     Vincent Barichard, 2012
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.dev
 *
 *  Permission is hereby granted, free of charge, to any person obtaining
 *  a copy of this software and associated documentation files (the
 *  "Software"), to deal in the Software without restriction, including
 *  without limitation the rights to use, copy, modify, merge, publish,
 *  distribute, sublicense, and/or sell copies of the Software, and to
 *  permit persons to whom the Software is furnished to do so, subject to
 *  the following conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
 
#include "test/float.hh"
 
#include <cmath>
 
namespace Test { namespace Float {

   namespace Basic {


     class Basic : public Test {
     public:
       Basic(Gecode::FloatNum n, Gecode::FloatNum s)
         : Test("Basic",3,-n,n,s,CPLT_ASSIGNMENT,false) {}

       Basic(Gecode::FloatVal v, Gecode::FloatNum s)
          : Test("Basic",3,v,s,CPLT_ASSIGNMENT,false) {}

       virtual MaybeType solution(const Assignment&) const {
         return MT_TRUE;
       }

       virtual void post(Gecode::Space&, Gecode::FloatVarArray&) {
       }

       virtual void post(Gecode::Space&, Gecode::FloatVarArray&, Gecode::Reify) {
         // Reification for no constraint is not interesting
         GECODE_NEVER;
       }
     };
 
     namespace {
       Basic b1(3,1.5);
       Basic b2(Gecode::FloatVal(-2,10),1.5);
     }

     class Median : public Base {
     private:
       static bool valid(const Gecode::FloatVal& x) {
         const Gecode::FloatNum m = x.med();
         return (m >= x.min()) && (m <= x.max()) &&
           (x.tight() || ((m > x.min()) && (m < x.max())));
       }
     public:
       Median(void) : Base("Float::Basic::Median") {}
       virtual bool run(void) {
         using namespace Gecode;
         const FloatNum m = Gecode::Float::Limits::max;
         const FloatNum i = std::numeric_limits<FloatNum>::infinity();
         const FloatNum d = std::numeric_limits<FloatNum>::denorm_min();
         const FloatVal negative(-m, -m / 2.0);
         const FloatVal positive(m / 2.0, m);
         const FloatVal mixed(-m, m);
         // The subtraction-based formula rounds this median one ULP upward.
         const FloatVal closest(3.07187504409887e-53,
                                7.805365587017815e-45);
         return valid(negative) && valid(positive) && valid(mixed) &&
           (closest.med() == 3.902682808868283e-45) &&
           (FloatVal(-i,-1.0).med() == -i) &&
           (FloatVal(1.0,i).med() == i) &&
           (FloatVal(-i,i).med() == 0.0) &&
           (FloatVal(-i,-i).med() == -i) &&
           (FloatVal(i,i).med() == i) &&
           !std::signbit(FloatVal(-0.0,0.0).med()) &&
           (FloatVal(0.0,2.0*d).med() == d) &&
           (FloatVal(-2.0*d,0.0).med() == -d);
       }
     };
 
     namespace {
       Median median;
     }
 
   }
}}
 
// STATISTICS: test-float