alg.hh

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// alg.H
// created by ADP

/*************************************************************************

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#ifndef __RVL_ALG
#define __RVL_ALG

#include <iostream>
#include <fstream>
#include <sstream>
#include <iomanip>
#include <limits>
#include <exception>
#include <stdexcept>
#include <typeinfo>
#include <string>
#include "except.hh"

namespace RVLAlg {

  using namespace std;

  class Algorithm {
  public:

    Algorithm() {}
    virtual ~Algorithm() {}

    virtual void run() = 0;

  };

  class NoAlg: public Algorithm {
  public:
    void run() {}
  };

  class ListAlg: public Algorithm {
  public:
    ListAlg(Algorithm & first): islist(false), one(first), two(*this) {}
    ListAlg(Algorithm & first, Algorithm & next)
      : islist(true), one(first), two(next) {}

    virtual void run() {
      one.run();
      if( islist ) two.run();
    }


  protected:
    bool islist;
    Algorithm & one;
    Algorithm & two;

  };

#define STOP_LOOP true
#define CONTINUE_LOOP false

  class Terminator {
  public: 
    virtual ~Terminator() {}
    virtual bool query() = 0;
  };


  class LoopAlg: public Algorithm {
  public:
    LoopAlg(Algorithm & alg, Terminator & stop) : inside(alg), term(stop) { }

    virtual void run() {
      try {
    while( (!term.query()) ) {
      inside.run();
    }
      }
      catch (RVL::RVLException & e) {
    e<<"\ncalled from LoopAlg::run\n";
    throw e;
      }
    }

  protected:
    Algorithm & inside;
    Terminator & term;
  };

  class DoLoopAlg: public LoopAlg {
  public:
    DoLoopAlg(Algorithm & alg, Terminator & stop) : LoopAlg(alg,stop) {}

    virtual void run() {
      inside.run();
      LoopAlg::run();
    }
  };

  class CondListAlg: public ListAlg {

  public:
    CondListAlg(Algorithm & first, Algorithm & next, Terminator & _stop)
      : ListAlg(first,next), stop(_stop) {}

    virtual void run() {
      one.run();
      if( !stop.query() ) {
    two.run();
      }
    }

  protected:

    Terminator & stop;
  };

  template<class T>
  class StateAlg: public Algorithm {
  public:
    /*
      virtual void setState(const T & x) = 0;
    */
    virtual T & getState() = 0;
    virtual const T & getState() const = 0;
  };

  class BranchAlg : public Algorithm {
    
  public:
    BranchAlg(Terminator & iftest, 
          Algorithm & thenclause, 
          Algorithm & elseclause )
      : thencl(thenclause), elsecl(elseclause), test(iftest) {}
    
    virtual void run() {
      if( test.query() )
    thencl.run();
      else
    elsecl.run();
    }
      
  protected:
    Algorithm & thencl;
    Algorithm & elsecl;
    Terminator & test;
  };


}

#endif

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