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/* This file is part of Cloudy and is copyright (C)1978-2011 by Gary J. Ferland and
 * others.  For conditions of distribution and use see copyright notice in license.txt */

#ifndef COLLISION_H_
#define COLLISION_H_

 /* these are flags for various colliders that are used across the code */
enum collider {
        ipELECTRON,
        ipPROTON,
        ipHE_PLUS,
        ipALPHA,
        ipATOM_H,
        ipATOM_HE,
        ipH2_ORTHO,
        ipH2_PARA,
        ipH2,
        ipNCOLLIDER
};

class t_collider 
{
public:
        long charge;
        double *density;
        realnum mass_amu;

        t_collider()
        {
                charge = LONG_MAX;
                density = NULL;
                mass_amu = FLT_MAX;
        }
};

class ColliderList
{
public:
        vector<t_collider> list;
        ColliderList();
        void init();
};

extern ColliderList colliders;

class collision_rates
{
        double m_rate_coef_ul[ipNCOLLIDER];
        realnum m_rate_lu_nontherm;
public:
        collision_rates()
        {
                for( long i=0; i<ipNCOLLIDER; i++ )
                        m_rate_coef_ul[i] = 0.;
                m_rate_lu_nontherm = 0.f;

        }
        double *rate_coef_ul_set()
        {
                return m_rate_coef_ul;
        }
        const double *rate_coef_ul() const
        {
                return m_rate_coef_ul;
        }
        // nonthermal collisional excitiation rate [s-1]
        realnum &rate_lu_nontherm_set()
        {
                return m_rate_lu_nontherm;
        }
        realnum rate_lu_nontherm() const
        {
                return m_rate_lu_nontherm;
        }
};

class CollisionList;
class CollisionProxy
{
        CollisionList *m_list;
        int m_index;
public:
        explicit CollisionProxy(CollisionList *list, int index) 
                : m_list(list), m_index(index) {}

        realnum &col_str() const;
        double *rate_coef_ul_set() const;
        const double *rate_coef_ul() const;
        realnum &rate_lu_nontherm_set() const;
        realnum rate_lu_nontherm() const;
        double &cool() const;
        double &heat() const;

        realnum ColUL( const ColliderList& colls ) const
        {
                double rate = 0.;
                ASSERT( colls.list.size() == ipNCOLLIDER );
                for( unsigned i = 0; i < colls.list.size(); ++i )
                {
                        ASSERT( rate_coef_ul()[i] >= 0.0 );
                        rate += rate_coef_ul()[i] * (*colls.list[i].density);
                }
                ASSERT( rate >= 0. );
                return (realnum) rate;
        }
        
        void copy(CollisionProxy other)
        {
                col_str() = other.col_str();
                cool() = other.cool();
                heat() = other.heat();
                for (int i=0; i<ipNCOLLIDER; ++i)
                {
                        rate_coef_ul_set()[i] = other.rate_coef_ul()[i];
                }
                rate_lu_nontherm_set() = other.rate_lu_nontherm();
        }               
};

class  CollisionList
{
        vector<collision_rates> m_rates;
        vector<realnum> m_col_str;
        vector<double> m_cool;
        vector<double> m_heat;
        // DO NOT IMPEMENT
        CollisionList &operator=(const CollisionList&);
        CollisionList(const CollisionList&);
public:
        friend class CollisionProxy;
        typedef CollisionProxy reference;
        explicit CollisionList(size_t i)
        {
                resize(i);
        }
        explicit CollisionList() {}
        CollisionProxy operator[](size_t i)
        {
                return CollisionProxy(this,i);
        }
        size_t size(void) const
        {
                return m_rates.size();
        }
        void resize(size_t i)
        {
                m_rates.resize(i);
                m_col_str.resize(i);
                m_cool.resize(i);
                m_heat.resize(i);
        }
        void reserve(size_t i)
        {
                m_rates.reserve(i);
                m_col_str.reserve(i);
                m_cool.reserve(i);
                m_heat.reserve(i);
        }
};

inline realnum &CollisionProxy::col_str() const
{
        return m_list->m_col_str[m_index];
}
inline double *CollisionProxy::rate_coef_ul_set() const
{
        return m_list->m_rates[m_index].rate_coef_ul_set();
}
inline const double *CollisionProxy::rate_coef_ul() const
{
        return m_list->m_rates[m_index].rate_coef_ul();
}
// nonthermal collisional excitation rate [s-1]
inline realnum &CollisionProxy::rate_lu_nontherm_set() const
{
        return m_list->m_rates[m_index].rate_lu_nontherm_set();
}
inline realnum CollisionProxy::rate_lu_nontherm() const
{
        return m_list->m_rates[m_index].rate_lu_nontherm();
}
inline double &CollisionProxy::cool() const
{
        return m_list->m_cool[m_index];
}
inline double &CollisionProxy::heat() const
{
        return m_list->m_heat[m_index];
}

void CollisionJunk( const CollisionProxy & t );

void CollisionZero( const CollisionProxy & t );

#endif // COLLISION_H_

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