when.hpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2009
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
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 *  a copy of this software and associated documentation files (the
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namespace Gecode { namespace Int { namespace Exec {
 
  forceinline
  When::When(Home home, BoolView x,
             std::function<void(Space& home)> t0,
             std::function<void(Space& home)> e0)
    : UnaryPropagator<BoolView,PC_BOOL_VAL>(home,x), t(t0), e(e0) {
    home.notice(*this,AP_DISPOSE);
  }
 
  forceinline
  When::When(Space& home, When& p)
    : UnaryPropagator<BoolView,PC_BOOL_VAL>(home,p), t(p.t), e(p.e) {
  }
 
  forceinline ExecStatus
  When::post(Home home, BoolView x,
             std::function<void(Space& home)> t,
             std::function<void(Space& home)> e) {
    if (!t)
      throw InvalidFunction("When::When");
    if (!e)
      throw InvalidFunction("When::When");
    if (x.zero()) {
      e(home);
      return home.failed() ? ES_FAILED : ES_OK;
    } else if (x.one()) {
      t(home);
      return home.failed() ? ES_FAILED : ES_OK;
    } else {
      (void) new (home) When(home,x,t,e);
      return ES_OK;
    }
  }
 
}}}
 
// STATISTICS: int-prop