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struct SaplingTree {
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struct SaplingTree {
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    SaplingTree() { clear(); }
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    SaplingTree() { clear(); }
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    short unsigned int age;  // number of consectuive years the sapling suffers from dire conditions
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    short unsigned int age;  // number of consectuive years the sapling suffers from dire conditions
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    short signed int species_index; // index of the species within the resource-unit-species container
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    short signed int species_index; // index of the species within the resource-unit-species container
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    unsigned char stress_years; // (upper 16bits) + age of sapling (lower 16 bits)
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    unsigned char stress_years; // (upper 16bits) + age of sapling (lower 16 bits)
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    unsigned char flags;
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    unsigned char flags; // flags, e.g. whether sapling stems from sprouting
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    float height; // height of the sapling in meter
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    float height; // height of the sapling in meter
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    bool is_occupied() const { return height>0.f; }
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    bool is_occupied() const { return height>0.f; }
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    void clear()  {  age=0; species_index=-1; stress_years=0; flags=0; height=0.f;  }
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    void clear()  {  age=0; species_index=-1; stress_years=0; flags=0; height=0.f;  }
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    void setSapling(const float h_m, const int age_yrs, const int species_idx) { height=h_m; age=static_cast<short unsigned int>(age_yrs); stress_years=0; species_index=static_cast<short signed int>(species_idx); }
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    void setSapling(const float h_m, const int age_yrs, const int species_idx) { height=h_m; age=static_cast<short unsigned int>(age_yrs); stress_years=0; species_index=static_cast<short signed int>(species_idx); }
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    // flags
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    bool is_sprout() const { return flags & 1; }
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    void set_sprout(const bool sprout) {if (sprout) flags |= 1; else flags &= (1 ^ 0xffffff ); }
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};
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};
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#define NSAPCELLS 5
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#define NSAPCELLS 5
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struct SaplingCell {
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struct SaplingCell {
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    enum ECellState { CellInvalid=0, CellFree=1, CellFull=2};
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    enum ECellState { CellInvalid=0, CellFree=1, CellFull=2};
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    SaplingCell() {
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    SaplingCell() {
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    /// return the SaplingCell (i.e. container for the ind. saplings) for the given 2x2m coordinates
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    /// return the SaplingCell (i.e. container for the ind. saplings) for the given 2x2m coordinates
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    /// if 'only_valid' is true, then 0 is returned if no living saplings are on the cell
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    /// if 'only_valid' is true, then 0 is returned if no living saplings are on the cell
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    /// 'rRUPtr' is a pointer to a RU-ptr: if provided, a pointer to the resource unit is stored
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    /// 'rRUPtr' is a pointer to a RU-ptr: if provided, a pointer to the resource unit is stored
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    SaplingCell *cell(QPoint lif_coords, bool only_valid=true, ResourceUnit **rRUPtr=0);
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    SaplingCell *cell(QPoint lif_coords, bool only_valid=true, ResourceUnit **rRUPtr=0);
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    /// clear/kill all saplings within the rectangle given by 'rectangle'.
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    /// clear/kill all saplings within the rectangle given by 'rectangle'.
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    /// If 'remove_biomass' is true, then the biomass is extracted (e.g. burnt)
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    /// If 'remove_biomass' is true, then the biomass is extracted (e.g. burnt), otherwise they are moved to soil
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    void clearSaplings(const QRectF &rectangle, const bool remove_biomass);
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    void clearSaplings(const QRectF &rectangle, const bool remove_biomass);
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    /// clear all saplings on a given cell 's' (if 'remove_biomass' is true: biomass removed from system (e.g. burnt))
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    void clearSaplings(SaplingCell *s, ResourceUnit *ru, const bool remove_biomass);
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    /// generate vegetative offspring from 't' (sprouts)


          

          

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    int addSprout(const Tree *t);


          

          

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    static void setRecruitmentVariation(const double variation) { mRecruitmentVariation = variation; }


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    static void setRecruitmentVariation(const double variation) { mRecruitmentVariation = variation; }


          

          

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    static void updateBrowsingPressure();


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    static void updateBrowsingPressure();


          

          

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private:


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private: