AMReX_BoxArray.H

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#ifndef BL_BOXARRAY_H
#define BL_BOXARRAY_H
#include <AMReX_Config.H>
 
#include <AMReX_IndexType.H>
#include <AMReX_BoxList.H>
#include <AMReX_Array.H>
#include <AMReX_Periodicity.H>
#include <AMReX_Vector.H>
 
#include <iosfwd>
#include <atomic>
#include <cstddef>
#include <cstdint>
#include <map>
#include <memory>
#include <unordered_map>
 
namespace amrex
{
    class BoxArray;
 
    [[nodiscard]] BoxArray boxComplement (const Box& b1in, const Box& b2);
 
    [[nodiscard]] BoxArray complementIn (const Box& b, const BoxArray& ba);
 
    [[nodiscard]] BoxArray intersect (const BoxArray& ba, const Box& b, int ng = 0);
 
    [[nodiscard]] BoxArray intersect (const BoxArray& ba, const Box& b, const IntVect& ng);
 
    [[nodiscard]] BoxArray intersect (const BoxArray& lhs, const BoxArray& rhs);
 
    [[nodiscard]] BoxList intersect (const BoxArray& ba, const BoxList& bl);
 
    [[nodiscard]] BoxArray convert (const BoxArray& ba, IndexType typ);
    [[nodiscard]] BoxArray convert (const BoxArray& ba, const IntVect& typ);
 
    [[nodiscard]] BoxArray coarsen (const BoxArray& ba, int ratio);
    [[nodiscard]] BoxArray coarsen (const BoxArray& ba, const IntVect& ratio);
 
    [[nodiscard]] BoxArray refine  (const BoxArray& ba, int ratio);
    [[nodiscard]] BoxArray refine  (const BoxArray& ba, const IntVect& ratio);
 
    [[nodiscard]] BoxList GetBndryCells (const BoxArray& ba, int ngrow);
 
    void readBoxArray (BoxArray& ba, std::istream& s, bool b = false);
 
    [[nodiscard]] bool match (const BoxArray& x, const BoxArray& y);
 
    [[nodiscard]] BoxArray decompose (Box const& domain, int nboxes,
                                      Array<bool,AMREX_SPACEDIM> const& decomp
                                      = {AMREX_D_DECL(true,true,true)},
                                      bool no_overlap = false);
 
struct BARef
{
    BARef ();
    explicit BARef (size_t size);
    explicit BARef (const Box& b);
    explicit BARef (const BoxList& bl);
    explicit BARef (BoxList&& bl) noexcept;
    explicit BARef (std::istream& is);
    BARef (const BARef& rhs);
    BARef (BARef&& rhs) = delete;
    BARef& operator= (const BARef& rhs) = delete;
    BARef& operator= (BARef&& rhs) = delete;
 
    ~BARef ();
 
    void define (const Box& bx);
    void define (const BoxList& bl);
    void define (BoxList&& bl) noexcept;
    void define (std::istream& is, int& ndims);
    void resize (Long n);
#ifdef AMREX_MEM_PROFILING
    void updateMemoryUsage_box (int s);
    void updateMemoryUsage_hash (int s);
#endif
 
    [[nodiscard]] bool HasHashMap () const noexcept {
        return has_hashmap.load(std::memory_order_acquire);
    }
 
    //
    Vector<Box> m_abox;
    //
    mutable Box bbox;
 
    mutable IntVect crsn;
 
    using HashType = std::unordered_map< IntVect, std::vector<int>, IntVect::shift_hasher > ;
    //using HashType = std::map< IntVect,std::vector<int> >;
 
    mutable HashType hash;
 
    mutable std::atomic<bool> has_hashmap = false;
 
    static int  numboxarrays;
    static int  numboxarrays_hwm;
    static Long total_box_bytes;
    static Long total_box_bytes_hwm;
    static Long total_hash_bytes;
    static Long total_hash_bytes_hwm;
 
    static void Initialize ();
    static void Finalize ();
    static bool initialized;
};
 
struct BATnull
{
    [[nodiscard]] Box operator() (const Box& bx) const noexcept { return bx; }
    [[nodiscard]] static constexpr Box coarsen (Box const& a_box) { return a_box; }
    [[nodiscard]] static constexpr IntVect doiLo () { return IntVect::TheZeroVector(); }
    [[nodiscard]] static constexpr IntVect doiHi () { return IntVect::TheZeroVector(); }
    [[nodiscard]] static constexpr IndexType index_type () { return IndexType(); }
    [[nodiscard]] static constexpr IntVect coarsen_ratio () { return IntVect::TheUnitVector(); }
};
 
struct BATindexType
{
    explicit BATindexType (IndexType a_typ) : m_typ(a_typ) {}
    [[nodiscard]] Box operator() (const Box& bx) const noexcept { return amrex::convert(bx,m_typ); }
    [[nodiscard]] static Box coarsen (Box const& a_box) noexcept { return a_box; }
    [[nodiscard]] static constexpr IntVect doiLo () { return IntVect::TheZeroVector(); }
    [[nodiscard]] IntVect doiHi () const noexcept { return m_typ.ixType(); }
    [[nodiscard]] IndexType index_type () const noexcept { return m_typ; }
    [[nodiscard]] static constexpr IntVect coarsen_ratio () { return IntVect::TheUnitVector(); }
    IndexType m_typ;
};
 
struct BATcoarsenRatio
{
    explicit BATcoarsenRatio (IntVect const& a_crse_ratio) : m_crse_ratio(a_crse_ratio) {}
    [[nodiscard]] Box operator() (const Box& bx) const noexcept { return amrex::coarsen(bx,m_crse_ratio); }
    [[nodiscard]] Box coarsen (Box const& a_box) const noexcept { return amrex::coarsen(a_box,m_crse_ratio); }
    [[nodiscard]] static constexpr IntVect doiLo () { return IntVect::TheZeroVector(); }
    [[nodiscard]] static constexpr IntVect doiHi () { return IntVect::TheZeroVector(); }
    [[nodiscard]] static constexpr IndexType index_type () { return IndexType(); }
    [[nodiscard]] IntVect coarsen_ratio () const noexcept { return m_crse_ratio; }
    IntVect m_crse_ratio;
};
 
struct BATindexType_coarsenRatio
{
    BATindexType_coarsenRatio (IndexType a_typ, IntVect const& a_crse_ratio)
        : m_typ(a_typ), m_crse_ratio(a_crse_ratio) {}
 
    [[nodiscard]] Box operator() (const Box& bx) const noexcept {
        return amrex::convert(amrex::coarsen(bx,m_crse_ratio),m_typ);
    }
 
    [[nodiscard]] Box coarsen (Box const& a_box) const noexcept { return amrex::coarsen(a_box,m_crse_ratio); }
 
    [[nodiscard]] static constexpr IntVect doiLo () { return IntVect::TheZeroVector(); }
    [[nodiscard]] IntVect doiHi () const noexcept { return m_typ.ixType(); }
 
    [[nodiscard]] IndexType index_type () const noexcept { return m_typ; }
    [[nodiscard]] IntVect coarsen_ratio () const noexcept { return m_crse_ratio; }
 
    IndexType m_typ;
    IntVect m_crse_ratio;
};
 
struct BATbndryReg
{
    BATbndryReg (Orientation a_face, IndexType a_typ,
                 int a_in_rad, int a_out_rad, int a_extent_rad)
        : m_face(a_face), m_typ(a_typ), m_crse_ratio(1)
    {
        m_loshft = IntVect(-a_extent_rad);
        m_hishft = IntVect( a_extent_rad);
        IntVect nodal = a_typ.ixType();
        m_hishft += nodal;
        const int d = a_face.coordDir();
        if (nodal[d]) {
            // InterpFaceRegister & SyncRegister in IAMR
            if (m_face.isLow()) {
                m_loshft[d] = 0;
                m_hishft[d] = 0;
            } else {
                m_loshft[d] = 1;
                m_hishft[d] = 1;
            }
            m_doilo = IntVect(0);
            m_doihi = nodal;
        } else {
            // BndryRegister
            if (m_face.isLow()) {
                m_loshft[d] = nodal[d] - a_out_rad;
                m_hishft[d] = nodal[d] + a_in_rad - 1;
            } else {
                m_loshft[d] = 1 - a_in_rad;
                m_hishft[d] = a_out_rad;
            }
            m_doilo = IntVect(a_extent_rad);
            m_doihi = IntVect(a_extent_rad);
            m_doihi += nodal;
            if (m_face.isLow()) {  // domain of influence in index space
                m_doilo[d] = a_out_rad;
                m_doihi[d] = 0;
            } else {
                m_doilo[d] = 0;
                m_doihi[d] = a_out_rad;
            }
        }
    }
 
    [[nodiscard]] Box operator() (const Box& a_bx) const noexcept {
        IntVect lo = amrex::coarsen(a_bx.smallEnd(), m_crse_ratio);
        IntVect hi = amrex::coarsen(a_bx.bigEnd(), m_crse_ratio);
        const int d = m_face.coordDir();
        if (m_face.isLow()) {
            hi[d] = lo[d];
        } else {
            lo[d] = hi[d];
        }
        lo += m_loshft;
        hi += m_hishft;
        return Box(lo,hi,m_typ);
    }
 
    [[nodiscard]] Box coarsen (Box const& a_box) const noexcept { return amrex::coarsen(a_box,m_crse_ratio); }
 
    [[nodiscard]] IntVect doiLo () const noexcept { return m_doilo; }
    [[nodiscard]] IntVect doiHi () const noexcept { return m_doihi; }
 
    [[nodiscard]] IndexType index_type () const noexcept { return m_typ; }
    [[nodiscard]] IntVect coarsen_ratio () const noexcept { return m_crse_ratio; }
 
    friend bool operator== (BATbndryReg const& a, BATbndryReg const& b) noexcept {
        return a.m_face == b.m_face && a.m_typ == b.m_typ && a.m_crse_ratio == b.m_crse_ratio
            && a.m_loshft == b.m_loshft && a.m_hishft == b.m_hishft
            && a.m_doilo == b.m_doilo && a.m_doihi == b.m_doihi;
    }
 
    Orientation m_face;
    IndexType m_typ;
    IntVect m_crse_ratio;
    IntVect m_loshft;
    IntVect m_hishft;
    IntVect m_doilo;
    IntVect m_doihi;
};
 
struct BATransformer
{
    enum struct BATType : std::int8_t { null, indexType, coarsenRatio, indexType_coarsenRatio, bndryReg};
 
    union BATOp {
        BATOp () noexcept
            : m_null() {}
        BATOp (IndexType t) noexcept
            : m_indexType(t) {}
        BATOp (IntVect const& r) noexcept
            : m_coarsenRatio(r) {}
        BATOp (IndexType t, IntVect const& r) noexcept
            : m_indexType_coarsenRatio(t,r) {}
        BATOp (Orientation f, IndexType t, int in_rad, int out_rad, int extent_rad) noexcept
            : m_bndryReg(f,t,in_rad,out_rad,extent_rad) {}
        BATnull  m_null;
        BATindexType m_indexType;
        BATcoarsenRatio m_coarsenRatio;
        BATindexType_coarsenRatio m_indexType_coarsenRatio;
        BATbndryReg m_bndryReg;
    };
 
    BATransformer () = default;
 
    BATransformer (IndexType t)
        : m_bat_type(t.cellCentered() ? BATType::null : BATType::indexType),
          m_op      (t.cellCentered() ? BATOp()       : BATOp(t)) {}
 
    BATransformer (Orientation f, IndexType t, int in_rad, int out_rad, int extent_rad)
        : m_bat_type(BATType::bndryReg),
          m_op(f,t,in_rad,out_rad,extent_rad) {}
 
    [[nodiscard]] Box operator() (Box const& ab) const noexcept {
        switch (m_bat_type)
        {
        case     BATType::null:
            return m_op.m_null(ab);
        case     BATType::indexType:
            return m_op.m_indexType(ab);
        case     BATType::coarsenRatio:
            return m_op.m_coarsenRatio(ab);
        case     BATType::indexType_coarsenRatio:
            return m_op.m_indexType_coarsenRatio(ab);
        default:
            return m_op.m_bndryReg(ab);
        }
    }
 
    [[nodiscard]] Box coarsen (Box const& a_box) const noexcept  {
        switch (m_bat_type)
        {
        case     BATType::null:
            return amrex::BATnull::coarsen(a_box);
        case     BATType::indexType:
            return amrex::BATindexType::coarsen(a_box);
        case     BATType::coarsenRatio:
            return m_op.m_coarsenRatio.coarsen(a_box);
        case     BATType::indexType_coarsenRatio:
            return m_op.m_indexType_coarsenRatio.coarsen(a_box);
        default:
            return m_op.m_bndryReg.coarsen(a_box);
        }
    }
 
    [[nodiscard]] IntVect doiLo () const noexcept  {
        switch (m_bat_type)
        {
        case     BATType::null:
            return amrex::BATnull::doiLo();
        case     BATType::indexType:
            return amrex::BATindexType::doiLo();
        case     BATType::coarsenRatio:
            return amrex::BATcoarsenRatio::doiLo();
        case     BATType::indexType_coarsenRatio:
            return amrex::BATindexType_coarsenRatio::doiLo();
        default:
            return m_op.m_bndryReg.doiLo();
        }
    }
 
    [[nodiscard]] IntVect doiHi () const noexcept  {
        switch (m_bat_type)
        {
        case     BATType::null:
            return amrex::BATnull::doiHi();
        case     BATType::indexType:
            return m_op.m_indexType.doiHi();
        case     BATType::coarsenRatio:
            return amrex::BATcoarsenRatio::doiHi();
        case     BATType::indexType_coarsenRatio:
            return m_op.m_indexType_coarsenRatio.doiHi();
        default:
            return m_op.m_bndryReg.doiHi();
        }
    }
 
    [[nodiscard]] IndexType index_type () const noexcept  {
        switch (m_bat_type)
        {
        case     BATType::null:
            return amrex::BATnull::index_type();
        case     BATType::indexType:
            return m_op.m_indexType.index_type();
        case     BATType::coarsenRatio:
            return amrex::BATcoarsenRatio::index_type();
        case     BATType::indexType_coarsenRatio:
            return m_op.m_indexType_coarsenRatio.index_type();
        default:
            return m_op.m_bndryReg.index_type();
        }
    }
 
    [[nodiscard]] IntVect coarsen_ratio () const noexcept  {
        switch (m_bat_type)
        {
        case     BATType::null:
            return amrex::BATnull::coarsen_ratio();
        case     BATType::indexType:
            return amrex::BATindexType::coarsen_ratio();
        case     BATType::coarsenRatio:
            return m_op.m_coarsenRatio.coarsen_ratio();
        case     BATType::indexType_coarsenRatio:
            return m_op.m_indexType_coarsenRatio.coarsen_ratio();
        default:
            return m_op.m_bndryReg.coarsen_ratio();
        }
    }
 
    [[nodiscard]] bool is_null () const noexcept {
        return m_bat_type == BATType::null;
    }
 
    [[nodiscard]] bool is_simple () const noexcept {
        return m_bat_type != BATType::bndryReg;
    }
 
    void set_coarsen_ratio (IntVect const& a_ratio) noexcept {
        switch (m_bat_type)
        {
        case BATType::null:
        {
            if (a_ratio == IntVect::TheUnitVector()) {
                return;
            } else {
                m_bat_type = BATType::coarsenRatio;
                m_op.m_coarsenRatio.m_crse_ratio = a_ratio;
                return;
            }
        }
        case BATType::indexType:
        {
            if (a_ratio == IntVect::TheUnitVector()) {
                return;
            } else {
                m_bat_type = BATType::indexType_coarsenRatio;
                auto t = m_op.m_indexType.m_typ;
                m_op.m_indexType_coarsenRatio.m_typ = t;
                m_op.m_indexType_coarsenRatio.m_crse_ratio = a_ratio;
                return;
            }
        }
        case BATType::coarsenRatio:
        {
            if (a_ratio == IntVect::TheUnitVector()) {
                m_bat_type = BATType::null;
                return;
            } else {
                m_op.m_coarsenRatio.m_crse_ratio = a_ratio;
                return;
            }
        }
        case BATType::indexType_coarsenRatio:
        {
            if (a_ratio == IntVect::TheUnitVector()) {
                m_bat_type = BATType::indexType;
                auto t = m_op.m_indexType_coarsenRatio.m_typ;
                m_op.m_indexType.m_typ = t;
                return;
            } else {
                m_op.m_indexType_coarsenRatio.m_crse_ratio = a_ratio;
                return;
            }
        }
        default:
        {
            m_op.m_bndryReg.m_crse_ratio = a_ratio;
            return;
        }
        }
    }
 
    void set_index_type (IndexType typ) noexcept {
        switch (m_bat_type)
        {
        case BATType::null:
        {
            if (typ.cellCentered()) {
                return;
            } else {
                m_bat_type = BATType::indexType;
                m_op.m_indexType.m_typ = typ;
                return;
            }
        }
        case BATType::indexType:
        {
            if (typ.cellCentered()) {
                m_bat_type = BATType::null;
                return;
            } else {
                m_op.m_indexType.m_typ = typ;
                return;
            }
        }
        case BATType::coarsenRatio:
        {
            if (typ.cellCentered()) {
                return;
            } else {
                m_bat_type = BATType::indexType_coarsenRatio;
                auto r = m_op.m_coarsenRatio.m_crse_ratio;
                m_op.m_indexType_coarsenRatio.m_typ = typ;
                m_op.m_indexType_coarsenRatio.m_crse_ratio = r;
                return;
            }
        }
        case BATType::indexType_coarsenRatio:
        {
            if (typ.cellCentered()) {
                m_bat_type = BATType::coarsenRatio;
                auto r = m_op.m_indexType_coarsenRatio.m_crse_ratio;
                m_op.m_coarsenRatio.m_crse_ratio = r;
                return;
            } else {
                m_op.m_indexType_coarsenRatio.m_typ = typ;
                return;
            }
        }
        default:
        {
            m_op.m_bndryReg.m_typ = typ;
            return;
        }
        }
    }
 
    friend bool operator== (BATransformer const& a, BATransformer const& b) noexcept {
        if (a.m_bat_type != BATType::bndryReg && b.m_bat_type != BATType::bndryReg) {
            return a.index_type() == b.index_type()
                && a.coarsen_ratio() == b.coarsen_ratio();
        } else if (a.m_bat_type == BATType::bndryReg && b.m_bat_type == BATType::bndryReg) {
            return a.m_op.m_bndryReg == b.m_op.m_bndryReg;
        } else {
            return false;
        }
    }
 
    BATType m_bat_type{BATType::null};
    BATOp m_op;
};
 
// for backward compatibility
using BndryBATransformer = BATransformer;
 
class MFIter;
class AmrMesh;
class FabArrayBase;
 
class BoxArray
{
public:
 
    BoxArray () noexcept;
    BoxArray (const BoxArray& rhs) = default;
    BoxArray (BoxArray&& rhs) noexcept = default;
    BoxArray& operator= (BoxArray const& rhs) = default;
    BoxArray& operator= (BoxArray&& rhs) noexcept = default;
    ~BoxArray() noexcept = default;
 
    explicit BoxArray (const Box& bx);
 
    explicit BoxArray (size_t n);
 
    BoxArray (const Box* bxvec,
              int        nbox);
 
    explicit BoxArray (const BoxList& bl);
    explicit BoxArray (BoxList&& bl) noexcept;
 
    BoxArray (const BoxArray& rhs, const BATransformer& trans);
 
    BoxArray (BoxList&& bl, IntVect const& max_grid_size);
 
    void define (const Box& bx);
    void define (const BoxList& bl);
    void define (BoxList&& bl) noexcept;
 
    void clear ();
 
    void resize (Long len);
 
    [[nodiscard]] Long size () const noexcept { return m_ref->m_abox.size(); }
 
    [[nodiscard]] Long capacity () const noexcept { return static_cast<Long>(m_ref->m_abox.capacity()); }
 
    [[nodiscard]] bool empty () const noexcept { return m_ref->m_abox.empty(); }
 
    [[nodiscard]] Long numPts() const noexcept;
 
    [[nodiscard]] double d_numPts () const noexcept;
    int readFrom (std::istream& is);
 
    std::ostream& writeOn (std::ostream&) const;
 
    [[nodiscard]] bool operator== (const BoxArray& rhs) const noexcept;
 
    [[nodiscard]] bool operator!= (const BoxArray& rhs) const noexcept;
 
    [[nodiscard]] bool operator== (const Vector<Box>& bv) const noexcept;
    [[nodiscard]] bool operator!= (const Vector<Box>& bv) const noexcept;
 
    [[nodiscard]] bool CellEqual (const BoxArray& rhs) const noexcept;
 
    BoxArray& maxSize (int block_size);
 
    BoxArray& maxSize (const IntVect& block_size);
 
    BoxArray& minmaxSize (const IntVect& min_size, const IntVect& max_size);
 
    BoxArray& refine (int refinement_ratio);
 
    BoxArray& refine (const IntVect& iv);
 
    BoxArray& coarsen (int refinement_ratio);
 
    [[nodiscard]] bool coarsenable (int refinement_ratio, int min_width=1) const;
    [[nodiscard]] bool coarsenable (const IntVect& refinement_ratio, int min_width=1) const;
    [[nodiscard]] bool coarsenable (const IntVect& refinement_ratio, const IntVect& min_width) const;
 
    BoxArray& coarsen (const IntVect& iv);
 
    BoxArray& growcoarsen (int n, const IntVect& iv);
    BoxArray& growcoarsen (IntVect const& ngrow, const IntVect& iv);
 
    BoxArray& grow (int n);
 
    BoxArray& grow (const IntVect& iv);
    BoxArray& grow (int idir, int n_cell);
    BoxArray& growLo (int idir, int n_cell);
    BoxArray& growHi (int idir, int n_cell);
    BoxArray& surroundingNodes ();
    BoxArray& surroundingNodes (int dir);
 
    BoxArray& enclosedCells ();
 
    BoxArray& enclosedCells  (int dir);
 
    BoxArray& convert (IndexType typ);
 
    BoxArray& convert (const IntVect& iv);
 
    BoxArray& convert (Box (*fp)(const Box&));
 
    BoxArray& shift (int dir, int nzones);
 
    BoxArray& shift (const IntVect &iv);
 
    void set (int i, const Box& ibox);
 
    [[nodiscard]] Box operator[] (int index) const noexcept {
        return m_bat(m_ref->m_abox[index]);
    }
 
    [[nodiscard]] Box operator[] (const MFIter& mfi) const noexcept;
 
    [[nodiscard]] Box get (int index) const noexcept { return operator[](index); }
 
    [[nodiscard]] Box getCellCenteredBox (int index) const noexcept {
        return m_bat.coarsen(m_ref->m_abox[index]);
    }
 
    [[nodiscard]] bool ok () const;
 
    [[nodiscard]] bool isDisjoint () const;
 
    [[nodiscard]] BoxList boxList () const;
 
    [[nodiscard]] bool contains (const IntVect& v) const;
 
    [[nodiscard]]
    bool contains (const Box& b, bool assume_disjoint_ba = false,
                   const IntVect& ng = IntVect(0)) const;
 
    [[nodiscard]]
    bool contains (const BoxArray& ba, bool assume_disjoint_ba = false,
                   const IntVect& ng = IntVect(0)) const;
 
    [[nodiscard]]
    bool contains (const BoxArray& ba, Periodicity const& period) const;
 
    [[nodiscard]] Box minimalBox () const;
    [[nodiscard]] Box minimalBox (Long& npts_avg_box) const;
 
    [[nodiscard]]
    bool intersects (const Box& b, int ng = 0) const;
 
    [[nodiscard]]
    bool intersects (const Box& b, const IntVect& ng) const;
 
    [[nodiscard]]
    std::vector< std::pair<int,Box> > intersections (const Box& bx) const;
 
    [[nodiscard]]
    std::vector< std::pair<int,Box> > intersections (const Box& bx, bool first_only, int ng) const;
 
    [[nodiscard]]
    std::vector< std::pair<int,Box> > intersections (const Box& bx, bool first_only, const IntVect& ng) const;
 
    void intersections (const Box& bx, std::vector< std::pair<int,Box> >& isects) const;
 
    void intersections (const Box& bx, std::vector< std::pair<int,Box> >& isects,
                        bool first_only, int ng) const;
 
    void intersections (const Box& bx, std::vector< std::pair<int,Box> >& isects,
                        bool first_only, const IntVect& ng) const;
 
    [[nodiscard]] BoxList complementIn (const Box& b) const;
    void complementIn (BoxList& bl, const Box& b) const;
 
    [[nodiscard]] BoxList complementIn (const Box& b, const Periodicity& period) const;
 
    void clear_hash_bin () const;
 
    void removeOverlap (bool simplify=true);
 
    [[nodiscard]] static bool SameRefs (const BoxArray& lhs, const BoxArray& rhs) { return lhs.m_ref == rhs.m_ref; }
 
    struct RefID {
        RefID () noexcept  = default;
        explicit RefID (BARef* data_) noexcept : data(data_) {}
        bool operator<  (const RefID& rhs) const noexcept { return std::less<>()(data,rhs.data); }
        bool operator== (const RefID& rhs) const noexcept { return data == rhs.data; }
        bool operator!= (const RefID& rhs) const noexcept { return data != rhs.data; }
        friend std::ostream& operator<< (std::ostream& os, const RefID& id);
    private:
        BARef* data{nullptr};
    };
 
    [[nodiscard]] RefID getRefID () const noexcept { return RefID { m_ref.get() }; }
 
    [[nodiscard]] IndexType ixType () const noexcept { return m_bat.index_type(); }
 
    [[nodiscard]] IntVect crseRatio () const noexcept { return m_bat.coarsen_ratio(); }
 
    static void Initialize ();
    static void Finalize ();
    static bool initialized;
 
    void uniqify ();
 
    [[nodiscard]] BoxList const& simplified_list () const;
    [[nodiscard]] BoxArray simplified () const;
 
    [[nodiscard]] BATransformer const& transformer () const;
 
    [[nodiscard]] std::weak_ptr<BARef> getWeakRef () const;
    [[nodiscard]] std::shared_ptr<BARef> const& getSharedRef () const;
    std::shared_ptr<BARef>& getSharedRef ();
 
    friend class AmrMesh;
    friend class FabArrayBase;
 
private:
    void type_update ();
 
    [[nodiscard]] BARef::HashType& getHashMap () const;
 
    [[nodiscard]] IntVect getDoiLo () const noexcept;
    [[nodiscard]] IntVect getDoiHi () const noexcept;
 
    BATransformer m_bat;
    std::shared_ptr<BARef> m_ref;
    mutable std::shared_ptr<BoxList> m_simplified_list;
};
 
std::ostream& operator<< (std::ostream& os, const BoxArray& ba);
 
std::ostream& operator<< (std::ostream& os, const BoxArray::RefID& id);
 
}
 
#endif /*BL_BOXARRAY_H*/