/Users/barrand/private/dev/softinex/old/inexlib-1.2/inlib/inlib/lut

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// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file inlib.license for terms.

#ifndef inlib_lut
#define inlib_lut

namespace inlib {

// TB = Borne
template <class TB,class TO>
class lut {
public:  
  lut()
  :m_min(0),m_max(0)
  ,m_bornen(0)
  ,m_bornes(0)
  {}
  lut(const TB& a_min,const TB& a_max,unsigned int a_coln)
  :m_min(a_min)
  ,m_max(a_max)
  {
    //NOTE : we should have a_max>a_min and a_coln >=3.

    // a_coln = 5 :
    // <>  |  <>  |  <>  |  <>  |  <>  // a_coln <>
    //    min                  max
    // there are :
    //   5 <> 
    // and :
    //   4 |
    if(m_max<=m_min) m_max = m_min+1; //throw ?
    if(a_coln<3) { //throw ?
      m_bornen = 2;
      m_bornes = new TB[m_bornen];
      m_bornes[0] = m_min;
      m_bornes[1] = m_max;
    } else {
      m_bornen = a_coln-1;
      m_bornes = new TB[m_bornen];
      TB dx = (m_max-m_min)/(m_bornen-1);
      for(unsigned int i=0;i<m_bornen;i++) {
        m_bornes[i] = m_min+dx*i;
      }
    }
  }
  virtual ~lut(){delete [] m_bornes;}
public:
  lut(const lut& a_from)
  :m_min(a_from.m_min)
  ,m_max(a_from.m_max)
  ,m_bornen(a_from.m_bornen)
  ,m_bornes(0)
  {
    if(m_bornen) {
      m_bornes = new TB[m_bornen];
      for(unsigned int i=0;i<m_bornen;i++) {
        m_bornes[i] = a_from.m_bornes[i];
      }
    }
  }
  lut& operator=(const lut& a_from){
    delete [] m_bornes;
    m_bornes = 0;

    m_min = a_from.m_min;
    m_max = a_from.m_max;
    m_bornen = a_from.m_bornen;
    if(m_bornen) {
      m_bornes = new TB[m_bornen];
      for(unsigned int i=0;i<m_bornen;i++) {
        m_bornes[i] = a_from.m_bornes[i];
      }
    }
    return *this;
  }
public:
  TO apply(const TB& a_x) const {
    // return something in [0,a_coln-1]
    TB* pos = m_bornes;
    for(TO i=0;i<m_bornen;i++,pos++) {
      if(a_x<*pos) return i;
    }
    return m_bornen;
  }
private:
  TB m_min,m_max;
  unsigned int m_bornen;
  TB* m_bornes;
private:
  static void check_instantiation() {
    lut<double,unsigned char> dummy(0,1,256);
    unsigned char o = dummy.apply(0.5);
  }
};

}

#endif