gecode 中的变量比较

最新推荐文章于 2025-04-09 09:30:57 发布

weixin_30314813

最新推荐文章于 2025-04-09 09:30:57 发布

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文章标签： java

原文链接：http://www.cnblogs.com/crax/p/7466331.html

本文详细介绍了GECode中变量间的比较方法，包括等值、不等值及各种不等式的测试。通过模板函数实现，考虑了边界条件和域检查，适用于不同类型的变量。

gecode中变量比较，如是否包括等是放在reltest这个文件中，代码很简单，需要注意的就是dom中能中间因为hole被分隔成为很多个部份，所以这里需要通过形如ViewRanges<VX> rx(x);进行遍历，需要下一个时直接++rx;

  template<class VX, class VY>
  forceinline RelTest
  rtest_eq_bnd(VX x, VY y) {
    if ((x.min() > y.max()) || (x.max() < y.min())) return RT_FALSE;
    return (x.assigned() && y.assigned()) ? RT_TRUE : RT_MAYBE;
  }

  template<class VX, class VY>
  RelTest
  rtest_eq_dom_check(VX x, VY y) {
    ViewRanges<VX> rx(x);
    ViewRanges<VY> ry(y);
    while (rx() && ry()) {
      if (rx.max() < ry.min()) {
        ++rx;
      } else if (ry.max() < rx.min()) {
        ++ry;
      } else return RT_MAYBE;
    }
    return RT_FALSE;
  }

  template<class VX, class VY>
  forceinline RelTest
  rtest_eq_dom(VX x, VY y) {
    RelTest rt = rtest_eq_bnd(x,y);
    if (rt != RT_MAYBE) return rt;
    return (x.range() && y.range()) ? RT_MAYBE : rtest_eq_dom_check(x,y);
  }


  template<class VX>
  forceinline RelTest
  rtest_eq_bnd(VX x, int n) {
    if ((n > x.max()) || (n < x.min())) return RT_FALSE;
    return x.assigned() ? RT_TRUE : RT_MAYBE;
  }

  template<class VX>
  RelTest
  rtest_eq_dom_check(VX x, int n) {
    ViewRanges<VX> rx(x);
    while (n > rx.max()) ++rx;
    return (n >= rx.min()) ? RT_MAYBE : RT_FALSE;
  }

  template<class VX>
  forceinline RelTest
  rtest_eq_dom(VX x, int n) {
    RelTest rt = rtest_eq_bnd(x,n);
    if (rt != RT_MAYBE) return rt;
    return x.range() ? RT_MAYBE : rtest_eq_dom_check(x,n);
  }



  /*
   * Testing disequality
   *
   */

  template<class VX, class VY>
  forceinline RelTest
  rtest_nq_bnd(VX x, VY y) {
    if ((x.min() > y.max()) || (x.max() < y.min())) return RT_TRUE;
    return (x.assigned() && y.assigned()) ? RT_FALSE : RT_MAYBE;
  }

  template<class VX, class VY>
  forceinline RelTest
  rtest_nq_dom_check(VX x, VY y) {
    ViewRanges<VX> rx(x);
    ViewRanges<VY> ry(y);
    while (rx() && ry()) {
      if (rx.max() < ry.min()) {
        ++rx;
      } else if (ry.max() < rx.min()) {
        ++ry;
      } else return RT_MAYBE;
    }
    return RT_TRUE;
  }

  template<class VX, class VY>
  forceinline RelTest
  rtest_nq_dom(VX x, VY y) {
    RelTest rt = rtest_nq_bnd(x,y);
    if (rt != RT_MAYBE) return rt;
    return (x.range() && y.range()) ? RT_MAYBE : rtest_nq_dom_check(x,y);
  }


  template<class VX>
  forceinline RelTest
  rtest_nq_bnd(VX x, int n) {
    if ((n > x.max()) || (n < x.min())) return RT_TRUE;
    return (x.assigned()) ? RT_FALSE : RT_MAYBE;
  }

  template<class VX>
  forceinline RelTest
  rtest_nq_dom_check(VX x, int n) {
    ViewRanges<VX> rx(x);
    while (n > rx.max()) ++rx;
    return (n >= rx.min()) ? RT_MAYBE : RT_TRUE;
  }

  template<class VX>
  forceinline RelTest
  rtest_nq_dom(VX x, int n) {
    RelTest rt = rtest_nq_bnd(x,n);
    if (rt != RT_MAYBE) return rt;
    return x.range() ? RT_MAYBE : rtest_nq_dom_check(x,n);
  }


  /*
   * Testing inequalities
   *
   */

  template<class VX, class VY>
  forceinline RelTest
  rtest_lq(VX x, VY y) {
    if (x.max() <= y.min()) return RT_TRUE;
    if (x.min() > y.max())  return RT_FALSE;
    return RT_MAYBE;
  }

  template<class VX>
  forceinline RelTest
  rtest_lq(VX x, int n) {
    if (x.max() <= n) return RT_TRUE;
    if (x.min() > n)  return RT_FALSE;
    return RT_MAYBE;
  }

  template<class VX, class VY>
  forceinline RelTest
  rtest_le(VX x, VY y) {
    if (x.max() <  y.min()) return RT_TRUE;
    if (x.min() >= y.max()) return RT_FALSE;
    return RT_MAYBE;
  }

  template<class VX>
  forceinline RelTest
  rtest_le(VX x, int n) {
    if (x.max() <  n) return RT_TRUE;
    if (x.min() >= n) return RT_FALSE;
    return RT_MAYBE;
  }

  template<class VX, class VY>
  forceinline RelTest
  rtest_gq(VX x, VY y) {
    if (x.max() <  y.min()) return RT_FALSE;
    if (x.min() >= y.max()) return RT_TRUE;
    return RT_MAYBE;
  }

  template<class VX>
  forceinline RelTest
  rtest_gq(VX x, int n) {
    if (x.max() <  n) return RT_FALSE;
    if (x.min() >= n) return RT_TRUE;
    return RT_MAYBE;
  }

  template<class VX, class VY>
  forceinline RelTest
  rtest_gr(VX x, VY y) {
    if (x.max() <= y.min()) return RT_FALSE;
    if (x.min() >  y.max()) return RT_TRUE;
    return RT_MAYBE;
  }

  template<class VX>
  forceinline RelTest
  rtest_gr(VX x, int n) {
    if (x.max() <= n) return RT_FALSE;
    if (x.min() >  n) return RT_TRUE;
    return RT_MAYBE;
  }

转载于:https://www.cnblogs.com/crax/p/7466331.html