LeafNodeMask.h

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// Copyright Contributors to the OpenVDB Project
// SPDX-License-Identifier: MPL-2.0

#ifndef OPENVDB_TREE_LEAF_NODE_MASK_HAS_BEEN_INCLUDED
#define OPENVDB_TREE_LEAF_NODE_MASK_HAS_BEEN_INCLUDED

#include <openvdb/version.h>
#include <openvdb/Types.h>
#include <openvdb/io/Compression.h> // for io::readData(), etc.
#include <openvdb/math/Math.h> // for math::isZero()
#include <openvdb/util/NodeMasks.h>
#include "LeafNode.h"
#include "Iterator.h"
#include <iostream>
#include <sstream>
#include <string>
#include <type_traits>
#include <vector>


namespace openvdb {
OPENVDB_USE_VERSION_NAMESPACE
namespace OPENVDB_VERSION_NAME {
namespace tree {

template<Index Log2Dim>
class LeafNode<ValueMask, Log2Dim>
{
public:
    using LeafNodeType = LeafNode<ValueMask, Log2Dim>;
    using BuildType = ValueMask;// this is a rare case where
    using ValueType = bool;// value type != build type
    using Buffer = LeafBuffer<ValueType, Log2Dim>;// buffer uses the bool specialization
    using NodeMaskType = util::NodeMask<Log2Dim>;
    using Ptr = SharedPtr<LeafNodeType>;

    // These static declarations must be on separate lines to avoid VC9 compiler errors.
    static const Index LOG2DIM    = Log2Dim;    // needed by parent nodes
    static const Index TOTAL      = Log2Dim;    // needed by parent nodes
    static const Index DIM        = 1 << TOTAL; // dimension along one coordinate direction
    static const Index NUM_VALUES = 1 << 3 * Log2Dim;
    static const Index NUM_VOXELS = NUM_VALUES; // total number of voxels represented by this node
    static const Index SIZE       = NUM_VALUES;
    static const Index LEVEL      = 0;          // level 0 = leaf

    template<typename OtherValueType>
    struct ValueConverter { using Type = LeafNode<OtherValueType, Log2Dim>; };

    template<typename OtherNodeType>
    struct SameConfiguration {
        static const bool value = SameLeafConfig<LOG2DIM, OtherNodeType>::value;
    };

    LeafNode();

    explicit LeafNode(const Coord& xyz, bool value = false, bool dummy = false);

    LeafNode(PartialCreate, const Coord& xyz, bool value = false, bool dummy = false);

    LeafNode(const LeafNode&);

    template<typename OtherValueType>
    explicit LeafNode(const LeafNode<OtherValueType, Log2Dim>& other);

    template<typename ValueType>
    LeafNode(const LeafNode<ValueType, Log2Dim>& other, TopologyCopy);

    template<typename ValueType>
    LeafNode(const LeafNode<ValueType, Log2Dim>& other, bool offValue, bool onValue, TopologyCopy);
    template<typename ValueType>
    LeafNode(const LeafNode<ValueType, Log2Dim>& other, bool background, TopologyCopy);

    ~LeafNode();

    //
    // Statistics
    //
    static Index log2dim() { return Log2Dim; }
    static Index dim() { return DIM; }
    static Index size() { return SIZE; }
    static Index numValues() { return SIZE; }
    static Index getLevel() { return LEVEL; }
    static void getNodeLog2Dims(std::vector<Index>& dims) { dims.push_back(Log2Dim); }
    static Index getChildDim() { return 1; }
    static Index32 leafCount() { return 1; }
    void nodeCount(std::vector<Index32> &) const {}
    static Index32 nonLeafCount() { return 0; }

    Index64 onVoxelCount() const { return mBuffer.mData.countOn(); }
    Index64 offVoxelCount() const { return mBuffer.mData.countOff(); }
    Index64 onLeafVoxelCount() const { return this->onVoxelCount(); }
    Index64 offLeafVoxelCount() const { return this->offVoxelCount(); }
    static Index64 onTileCount()  { return 0; }
    static Index64 offTileCount() { return 0; }

    bool isEmpty() const { return mBuffer.mData.isOff(); }
    bool isDense() const { return mBuffer.mData.isOn(); }
    bool isAllocated() const { return true; }
    bool allocate() { return true; }

    Index64 memUsage() const;

    void evalActiveBoundingBox(CoordBBox& bbox, bool visitVoxels = true) const;

    CoordBBox getNodeBoundingBox() const { return CoordBBox::createCube(mOrigin, DIM); }

    void setOrigin(const Coord& origin) { mOrigin = origin; }
    const Coord& origin() const { return mOrigin; }
    void getOrigin(Coord& origin) const { origin = mOrigin; }
    void getOrigin(Int32& x, Int32& y, Int32& z) const { mOrigin.asXYZ(x, y, z); }

    static Index coordToOffset(const Coord& xyz);
    static Coord offsetToLocalCoord(Index n);
    Coord offsetToGlobalCoord(Index n) const;

    std::string str() const;

    template<typename OtherType, Index OtherLog2Dim>
    bool hasSameTopology(const LeafNode<OtherType, OtherLog2Dim>* other) const;

    bool operator==(const LeafNode&) const;
    bool operator!=(const LeafNode&) const;

    //
    // Buffer management
    //
    void swap(Buffer& other) { mBuffer.swap(other); }
    const Buffer& buffer() const { return mBuffer; }
    Buffer& buffer() { return mBuffer; }

    //
    // I/O methods
    //
    void readTopology(std::istream&, bool fromHalf = false);
    void writeTopology(std::ostream&, bool toHalf = false) const;

    void readBuffers(std::istream&, bool fromHalf = false);
    void readBuffers(std::istream& is, const CoordBBox&, bool fromHalf = false);
    void writeBuffers(std::ostream&, bool toHalf = false) const;

    //
    // Accessor methods
    //
    const bool& getValue(const Coord& xyz) const;
    const bool& getValue(Index offset) const;

    bool probeValue(const Coord& xyz, bool& val) const;

    static Index getValueLevel(const Coord&) { return LEVEL; }

    void setActiveState(const Coord& xyz, bool on);
    void setActiveState(Index offset, bool on) { assert(offset<SIZE); mBuffer.mData.set(offset, on); }

    void setValueOnly(const Coord& xyz, bool val);
    void setValueOnly(Index offset, bool val) { assert(offset<SIZE); mBuffer.setValue(offset,val); }

    void setValueOff(const Coord& xyz) { mBuffer.mData.setOff(this->coordToOffset(xyz)); }
    void setValueOff(Index offset) { assert(offset < SIZE); mBuffer.mData.setOff(offset); }

    void setValueOff(const Coord& xyz, bool val);
    void setValueOff(Index offset, bool val);

    void setValueOn(const Coord& xyz) { mBuffer.mData.setOn(this->coordToOffset(xyz)); }
    void setValueOn(Index offset) { assert(offset < SIZE); mBuffer.mData.setOn(offset); }

    void setValueOn(const Coord& xyz, bool val);
    void setValue(const Coord& xyz, bool val) { this->setValueOn(xyz, val); }
    void setValueOn(Index offset, bool val);

    template<typename ModifyOp>
    void modifyValue(Index offset, const ModifyOp& op);
    template<typename ModifyOp>
    void modifyValue(const Coord& xyz, const ModifyOp& op);

    template<typename ModifyOp>
    void modifyValueAndActiveState(const Coord& xyz, const ModifyOp& op);

    void setValuesOn() { mBuffer.mData.setOn(); }
    void setValuesOff() { mBuffer.mData.setOff(); }

    bool isValueOn(const Coord& xyz) const { return mBuffer.mData.isOn(this->coordToOffset(xyz)); }
    bool isValueOn(Index offset) const { assert(offset < SIZE); return mBuffer.mData.isOn(offset); }

    static bool hasActiveTiles() { return false; }

    void clip(const CoordBBox&, bool background);

    void fill(const CoordBBox& bbox, bool value, bool = false);
    void denseFill(const CoordBBox& bbox, bool value, bool = false) { this->fill(bbox, value); }

    void fill(const bool& value, bool dummy = false);

    template<typename DenseT>
    void copyToDense(const CoordBBox& bbox, DenseT& dense) const;

    template<typename DenseT>
    void copyFromDense(const CoordBBox& bbox, const DenseT& dense, bool background, bool tolerance);

    template<typename AccessorT>
    const bool& getValueAndCache(const Coord& xyz, AccessorT&) const {return this->getValue(xyz);}

    template<typename AccessorT>
    bool isValueOnAndCache(const Coord& xyz, AccessorT&) const { return this->isValueOn(xyz); }

    template<typename AccessorT>
    void setValueAndCache(const Coord& xyz, bool val, AccessorT&) { this->setValueOn(xyz, val); }

    template<typename AccessorT>
    void setValueOnlyAndCache(const Coord& xyz, bool val, AccessorT&) {this->setValueOnly(xyz,val);}

    template<typename AccessorT>
    void setValueOffAndCache(const Coord& xyz, bool value, AccessorT&)
    {
        this->setValueOff(xyz, value);
    }

    template<typename ModifyOp, typename AccessorT>
    void modifyValueAndCache(const Coord& xyz, const ModifyOp& op, AccessorT&)
    {
        this->modifyValue(xyz, op);
    }

    template<typename ModifyOp, typename AccessorT>
    void modifyValueAndActiveStateAndCache(const Coord& xyz, const ModifyOp& op, AccessorT&)
    {
        this->modifyValueAndActiveState(xyz, op);
    }

    template<typename AccessorT>
    void setActiveStateAndCache(const Coord& xyz, bool on, AccessorT&)
    {
        this->setActiveState(xyz, on);
    }

    template<typename AccessorT>
    bool probeValueAndCache(const Coord& xyz, bool& val, AccessorT&) const
    {
        return this->probeValue(xyz, val);
    }

    template<typename AccessorT>
    static Index getValueLevelAndCache(const Coord&, AccessorT&) { return LEVEL; }

    const bool& getFirstValue() const { if (mBuffer.mData.isOn(0)) return Buffer::sOn; else return Buffer::sOff; }
    const bool& getLastValue() const { if (mBuffer.mData.isOn(SIZE-1)) return Buffer::sOn; else return Buffer::sOff; }

    bool isConstant(bool& constValue, bool& state, bool tolerance = 0) const;

    bool medianAll() const;

    Index medianOn(ValueType &value) const;

    Index medianOff(ValueType &value) const;

    bool isInactive() const { return mBuffer.mData.isOff(); }

    void resetBackground(bool, bool) {}

    void negate() { mBuffer.mData.toggle(); }

    template<MergePolicy Policy>
    void merge(const LeafNode& other, bool bg = false, bool otherBG = false);
    template<MergePolicy Policy> void merge(bool tileValue, bool tileActive=false);

    void voxelizeActiveTiles(bool = true) {}

    template<typename OtherType>
    void topologyUnion(const LeafNode<OtherType, Log2Dim>& other);

    template<typename OtherType>
    void topologyIntersection(const LeafNode<OtherType, Log2Dim>& other, const bool&);

    template<typename OtherType>
    void topologyDifference(const LeafNode<OtherType, Log2Dim>& other, const bool&);

    template<typename CombineOp>
    void combine(const LeafNode& other, CombineOp& op);
    template<typename CombineOp>
    void combine(bool, bool valueIsActive, CombineOp& op);

    template<typename CombineOp, typename OtherType /*= bool*/>
    void combine2(const LeafNode& other, const OtherType&, bool valueIsActive, CombineOp&);
    template<typename CombineOp, typename OtherNodeT /*= LeafNode*/>
    void combine2(bool, const OtherNodeT& other, bool valueIsActive, CombineOp&);
    template<typename CombineOp, typename OtherNodeT /*= LeafNode*/>
    void combine2(const LeafNode& b0, const OtherNodeT& b1, CombineOp&);

    template<typename BBoxOp> void visitActiveBBox(BBoxOp&) const;

    template<typename VisitorOp> void visit(VisitorOp&);
    template<typename VisitorOp> void visit(VisitorOp&) const;

    template<typename OtherLeafNodeType, typename VisitorOp>
    void visit2Node(OtherLeafNodeType& other, VisitorOp&);
    template<typename OtherLeafNodeType, typename VisitorOp>
    void visit2Node(OtherLeafNodeType& other, VisitorOp&) const;
    template<typename IterT, typename VisitorOp>
    void visit2(IterT& otherIter, VisitorOp&, bool otherIsLHS = false);
    template<typename IterT, typename VisitorOp>
    void visit2(IterT& otherIter, VisitorOp&, bool otherIsLHS = false) const;

    void prune(const ValueType& /*tolerance*/ = zeroVal<ValueType>()) {}
    void addLeaf(LeafNode*) {}
    template<typename AccessorT>
    void addLeafAndCache(LeafNode*, AccessorT&) {}
    template<typename NodeT>
    NodeT* stealNode(const Coord&, const ValueType&, bool) { return nullptr; }
    template<typename NodeT>
    NodeT* probeNode(const Coord&) { return nullptr; }
    template<typename NodeT>
    const NodeT* probeConstNode(const Coord&) const { return nullptr; }
    template<typename ArrayT> void getNodes(ArrayT&) const {}
    template<typename ArrayT> void stealNodes(ArrayT&, const ValueType&, bool) {}

    void addTile(Index level, const Coord&, bool val, bool active);
    void addTile(Index offset, bool val, bool active);
    template<typename AccessorT>
    void addTileAndCache(Index level, const Coord&, bool val, bool active, AccessorT&);

    LeafNode* touchLeaf(const Coord&) { return this; }
    template<typename AccessorT>
    LeafNode* touchLeafAndCache(const Coord&, AccessorT&) { return this; }
    LeafNode* probeLeaf(const Coord&) { return this; }
    template<typename AccessorT>
    LeafNode* probeLeafAndCache(const Coord&, AccessorT&) { return this; }
    template<typename NodeT, typename AccessorT>
    NodeT* probeNodeAndCache(const Coord&, AccessorT&)
    {
        OPENVDB_NO_UNREACHABLE_CODE_WARNING_BEGIN
        if (!(std::is_same<NodeT, LeafNode>::value)) return nullptr;
        return reinterpret_cast<NodeT*>(this);
        OPENVDB_NO_UNREACHABLE_CODE_WARNING_END
    }

    const LeafNode* probeLeaf(const Coord&) const { return this; }
    template<typename AccessorT>
    const LeafNode* probeLeafAndCache(const Coord&, AccessorT&) const { return this; }
    const LeafNode* probeConstLeaf(const Coord&) const { return this; }
    template<typename AccessorT>
    const LeafNode* probeConstLeafAndCache(const Coord&, AccessorT&) const { return this; }
    template<typename NodeT, typename AccessorT>
    const NodeT* probeConstNodeAndCache(const Coord&, AccessorT&) const
    {
        OPENVDB_NO_UNREACHABLE_CODE_WARNING_BEGIN
        if (!(std::is_same<NodeT, LeafNode>::value)) return nullptr;
        return reinterpret_cast<const NodeT*>(this);
        OPENVDB_NO_UNREACHABLE_CODE_WARNING_END
    }

    //
    // Iterators
    //
protected:
    using MaskOnIter = typename NodeMaskType::OnIterator;
    using MaskOffIter = typename NodeMaskType::OffIterator;
    using MaskDenseIter = typename NodeMaskType::DenseIterator;

    template<typename MaskIterT, typename NodeT, typename ValueT>
    struct ValueIter:
        // Derives from SparseIteratorBase, but can also be used as a dense iterator,
        // if MaskIterT is a dense mask iterator type.
        public SparseIteratorBase<MaskIterT, ValueIter<MaskIterT, NodeT, ValueT>, NodeT, ValueT>
    {
        using BaseT = SparseIteratorBase<MaskIterT, ValueIter, NodeT, ValueT>;

        ValueIter() {}
        ValueIter(const MaskIterT& iter, NodeT* parent): BaseT(iter, parent) {}

        const bool& getItem(Index pos) const { return this->parent().getValue(pos); }
        const bool& getValue() const { return this->getItem(this->pos()); }

        // Note: setItem() can't be called on const iterators.
        void setItem(Index pos, bool value) const { this->parent().setValueOnly(pos, value); }
        // Note: setValue() can't be called on const iterators.
        void setValue(bool value) const { this->setItem(this->pos(), value); }

        // Note: modifyItem() can't be called on const iterators.
        template<typename ModifyOp>
        void modifyItem(Index n, const ModifyOp& op) const { this->parent().modifyValue(n, op); }
        // Note: modifyValue() can't be called on const iterators.
        template<typename ModifyOp>
        void modifyValue(const ModifyOp& op) const { this->modifyItem(this->pos(), op); }
    };

    template<typename MaskIterT, typename NodeT>
    struct ChildIter:
        public SparseIteratorBase<MaskIterT, ChildIter<MaskIterT, NodeT>, NodeT, bool>
    {
        ChildIter() {}
        ChildIter(const MaskIterT& iter, NodeT* parent): SparseIteratorBase<
            MaskIterT, ChildIter<MaskIterT, NodeT>, NodeT, bool>(iter, parent) {}
    };

    template<typename NodeT, typename ValueT>
    struct DenseIter: public DenseIteratorBase<
        MaskDenseIter, DenseIter<NodeT, ValueT>, NodeT, /*ChildT=*/void, ValueT>
    {
        using BaseT = DenseIteratorBase<MaskDenseIter, DenseIter, NodeT, void, ValueT>;
        using NonConstValueT = typename BaseT::NonConstValueType;

        DenseIter() {}
        DenseIter(const MaskDenseIter& iter, NodeT* parent): BaseT(iter, parent) {}

        bool getItem(Index pos, void*& child, NonConstValueT& value) const
        {
            value = this->parent().getValue(pos);
            child = nullptr;
            return false; // no child
        }

        // Note: setItem() can't be called on const iterators.
        //void setItem(Index pos, void* child) const {}

        // Note: unsetItem() can't be called on const iterators.
        void unsetItem(Index pos, const ValueT& val) const {this->parent().setValueOnly(pos, val);}
    };

public:
    using ValueOnIter = ValueIter<MaskOnIter, LeafNode, const bool>;
    using ValueOnCIter = ValueIter<MaskOnIter, const LeafNode, const bool>;
    using ValueOffIter = ValueIter<MaskOffIter, LeafNode, const bool>;
    using ValueOffCIter = ValueIter<MaskOffIter, const LeafNode, const bool>;
    using ValueAllIter = ValueIter<MaskDenseIter, LeafNode, const bool>;
    using ValueAllCIter = ValueIter<MaskDenseIter, const LeafNode, const bool>;
    using ChildOnIter = ChildIter<MaskOnIter, LeafNode>;
    using ChildOnCIter = ChildIter<MaskOnIter, const LeafNode>;
    using ChildOffIter = ChildIter<MaskOffIter, LeafNode>;
    using ChildOffCIter = ChildIter<MaskOffIter, const LeafNode>;
    using ChildAllIter = DenseIter<LeafNode, bool>;
    using ChildAllCIter = DenseIter<const LeafNode, const bool>;

    ValueOnCIter  cbeginValueOn() const { return ValueOnCIter(mBuffer.mData.beginOn(), this); }
    ValueOnCIter   beginValueOn() const { return ValueOnCIter(mBuffer.mData.beginOn(), this); }
    ValueOnIter    beginValueOn() { return ValueOnIter(mBuffer.mData.beginOn(), this); }
    ValueOffCIter cbeginValueOff() const { return ValueOffCIter(mBuffer.mData.beginOff(), this); }
    ValueOffCIter  beginValueOff() const { return ValueOffCIter(mBuffer.mData.beginOff(), this); }
    ValueOffIter   beginValueOff() { return ValueOffIter(mBuffer.mData.beginOff(), this); }
    ValueAllCIter cbeginValueAll() const { return ValueAllCIter(mBuffer.mData.beginDense(), this); }
    ValueAllCIter  beginValueAll() const { return ValueAllCIter(mBuffer.mData.beginDense(), this); }
    ValueAllIter   beginValueAll() { return ValueAllIter(mBuffer.mData.beginDense(), this); }

    ValueOnCIter  cendValueOn() const { return ValueOnCIter(mBuffer.mData.endOn(), this); }
    ValueOnCIter   endValueOn() const { return ValueOnCIter(mBuffer.mData.endOn(), this); }
    ValueOnIter    endValueOn() { return ValueOnIter(mBuffer.mData.endOn(), this); }
    ValueOffCIter cendValueOff() const { return ValueOffCIter(mBuffer.mData.endOff(), this); }
    ValueOffCIter  endValueOff() const { return ValueOffCIter(mBuffer.mData.endOff(), this); }
    ValueOffIter   endValueOff() { return ValueOffIter(mBuffer.mData.endOff(), this); }
    ValueAllCIter cendValueAll() const { return ValueAllCIter(mBuffer.mData.endDense(), this); }
    ValueAllCIter  endValueAll() const { return ValueAllCIter(mBuffer.mData.endDense(), this); }
    ValueAllIter   endValueAll() { return ValueAllIter(mBuffer.mData.endDense(), this); }

    // Note that [c]beginChildOn() and [c]beginChildOff() actually return end iterators,
    // because leaf nodes have no children.
    ChildOnCIter  cbeginChildOn() const { return ChildOnCIter(mBuffer.mData.endOn(), this); }
    ChildOnCIter   beginChildOn() const { return ChildOnCIter(mBuffer.mData.endOn(), this); }
    ChildOnIter    beginChildOn() { return ChildOnIter(mBuffer.mData.endOn(), this); }
    ChildOffCIter cbeginChildOff() const { return ChildOffCIter(mBuffer.mData.endOff(), this); }
    ChildOffCIter  beginChildOff() const { return ChildOffCIter(mBuffer.mData.endOff(), this); }
    ChildOffIter   beginChildOff() { return ChildOffIter(mBuffer.mData.endOff(), this); }
    ChildAllCIter cbeginChildAll() const { return ChildAllCIter(mBuffer.mData.beginDense(), this); }
    ChildAllCIter  beginChildAll() const { return ChildAllCIter(mBuffer.mData.beginDense(), this); }
    ChildAllIter   beginChildAll() { return ChildAllIter(mBuffer.mData.beginDense(), this); }

    ChildOnCIter  cendChildOn() const { return ChildOnCIter(mBuffer.mData.endOn(), this); }
    ChildOnCIter   endChildOn() const { return ChildOnCIter(mBuffer.mData.endOn(), this); }
    ChildOnIter    endChildOn() { return ChildOnIter(mBuffer.mData.endOn(), this); }
    ChildOffCIter cendChildOff() const { return ChildOffCIter(mBuffer.mData.endOff(), this); }
    ChildOffCIter  endChildOff() const { return ChildOffCIter(mBuffer.mData.endOff(), this); }
    ChildOffIter   endChildOff() { return ChildOffIter(mBuffer.mData.endOff(), this); }
    ChildAllCIter cendChildAll() const { return ChildAllCIter(mBuffer.mData.endDense(), this); }
    ChildAllCIter  endChildAll() const { return ChildAllCIter(mBuffer.mData.endDense(), this); }
    ChildAllIter   endChildAll() { return ChildAllIter(mBuffer.mData.endDense(), this); }

    //
    // Mask accessors
    //
    bool isValueMaskOn(Index n) const { return mBuffer.mData.isOn(n); }
    bool isValueMaskOn() const { return mBuffer.mData.isOn(); }
    bool isValueMaskOff(Index n) const { return mBuffer.mData.isOff(n); }
    bool isValueMaskOff() const { return mBuffer.mData.isOff(); }
    const NodeMaskType& getValueMask() const { return mBuffer.mData; }
    const NodeMaskType& valueMask() const { return mBuffer.mData; }
    NodeMaskType& getValueMask() { return mBuffer.mData; }
    void setValueMask(const NodeMaskType& mask) { mBuffer.mData = mask; }
    bool isChildMaskOn(Index) const { return false; } // leaf nodes have no children
    bool isChildMaskOff(Index) const { return true; }
    bool isChildMaskOff() const { return true; }
protected:
    void setValueMask(Index n, bool on) { mBuffer.mData.set(n, on); }
    void setValueMaskOn(Index n)  { mBuffer.mData.setOn(n); }
    void setValueMaskOff(Index n) { mBuffer.mData.setOff(n); }

    static void evalNodeOrigin(Coord& xyz) { xyz &= ~(DIM - 1); }

    template<typename NodeT, typename VisitorOp, typename ChildAllIterT>
    static inline void doVisit(NodeT&, VisitorOp&);

    template<typename NodeT, typename OtherNodeT, typename VisitorOp,
        typename ChildAllIterT, typename OtherChildAllIterT>
    static inline void doVisit2Node(NodeT& self, OtherNodeT& other, VisitorOp&);

    template<typename NodeT, typename VisitorOp,
        typename ChildAllIterT, typename OtherChildAllIterT>
    static inline void doVisit2(NodeT& self, OtherChildAllIterT&, VisitorOp&, bool otherIsLHS);

    Buffer mBuffer;

    Coord mOrigin;

private:
    template<typename, Index> friend class LeafNode;

    friend struct ValueIter<MaskOnIter, LeafNode, bool>;
    friend struct ValueIter<MaskOffIter, LeafNode, bool>;
    friend struct ValueIter<MaskDenseIter, LeafNode, bool>;
    friend struct ValueIter<MaskOnIter, const LeafNode, bool>;
    friend struct ValueIter<MaskOffIter, const LeafNode, bool>;
    friend struct ValueIter<MaskDenseIter, const LeafNode, bool>;

    friend class IteratorBase<MaskOnIter, LeafNode>;
    friend class IteratorBase<MaskOffIter, LeafNode>;
    friend class IteratorBase<MaskDenseIter, LeafNode>;

    template<typename, Index> friend class LeafBuffer;

}; // class LeafNode<ValueMask>




template<Index Log2Dim>
inline
LeafNode<ValueMask, Log2Dim>::LeafNode()
  : mOrigin(0, 0, 0)
{
}

template<Index Log2Dim>
inline
LeafNode<ValueMask, Log2Dim>::LeafNode(const Coord& xyz, bool value, bool active)
    : mBuffer(value || active)
    , mOrigin(xyz & (~(DIM - 1)))
{
}


template<Index Log2Dim>
inline
LeafNode<ValueMask, Log2Dim>::LeafNode(PartialCreate, const Coord& xyz, bool value, bool active)
    : mBuffer(value || active)
    , mOrigin(xyz & (~(DIM - 1)))
{
}


template<Index Log2Dim>
inline
LeafNode<ValueMask, Log2Dim>::LeafNode(const LeafNode &other)
    : mBuffer(other.mBuffer)
    , mOrigin(other.mOrigin)
{
}


// Copy-construct from a leaf node with the same configuration but a different ValueType.
template<Index Log2Dim>
template<typename ValueT>
inline
LeafNode<ValueMask, Log2Dim>::LeafNode(const LeafNode<ValueT, Log2Dim>& other)
    : mBuffer(other.valueMask())
    , mOrigin(other.origin())
{
}


template<Index Log2Dim>
template<typename ValueT>
inline
LeafNode<ValueMask, Log2Dim>::LeafNode(const LeafNode<ValueT, Log2Dim>& other,
                                         bool, TopologyCopy)
    : mBuffer(other.valueMask())// value = active state
    , mOrigin(other.origin())
{
}


template<Index Log2Dim>
template<typename ValueT>
inline
LeafNode<ValueMask, Log2Dim>::LeafNode(const LeafNode<ValueT, Log2Dim>& other, TopologyCopy)
    : mBuffer(other.valueMask())// value = active state
    , mOrigin(other.origin())
{
}


template<Index Log2Dim>
template<typename ValueT>
inline
LeafNode<ValueMask, Log2Dim>::LeafNode(const LeafNode<ValueT, Log2Dim>& other,
                                         bool offValue, bool onValue, TopologyCopy)
    : mBuffer(other.valueMask())
    , mOrigin(other.origin())
{
    if (offValue==true) {
        if (onValue==false) {
            mBuffer.mData.toggle();
        } else {
            mBuffer.mData.setOn();
        }
    }
}


template<Index Log2Dim>
inline
LeafNode<ValueMask, Log2Dim>::~LeafNode()
{
}




template<Index Log2Dim>
inline Index64
LeafNode<ValueMask, Log2Dim>::memUsage() const
{
    // Use sizeof(*this) to capture alignment-related padding
    return sizeof(*this);
}


template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::evalActiveBoundingBox(CoordBBox& bbox, bool visitVoxels) const
{
    CoordBBox this_bbox = this->getNodeBoundingBox();
    if (bbox.isInside(this_bbox)) return;//this LeafNode is already enclosed in the bbox
    if (ValueOnCIter iter = this->cbeginValueOn()) {//any active values?
        if (visitVoxels) {//use voxel granularity?
            this_bbox.reset();
            for(; iter; ++iter) this_bbox.expand(this->offsetToLocalCoord(iter.pos()));
            this_bbox.translate(this->origin());
        }
        bbox.expand(this_bbox);
    }
}


template<Index Log2Dim>
template<typename OtherType, Index OtherLog2Dim>
inline bool
LeafNode<ValueMask, Log2Dim>::hasSameTopology(const LeafNode<OtherType, OtherLog2Dim>* other) const
{
    assert(other);
    return (Log2Dim == OtherLog2Dim && mBuffer.mData == other->getValueMask());
}


template<Index Log2Dim>
inline std::string
LeafNode<ValueMask, Log2Dim>::str() const
{
    std::ostringstream ostr;
    ostr << "LeafNode @" << mOrigin << ": ";
    for (Index32 n = 0; n < SIZE; ++n) ostr << (mBuffer.mData.isOn(n) ? '#' : '.');
    return ostr.str();
}




template<Index Log2Dim>
inline Index
LeafNode<ValueMask, Log2Dim>::coordToOffset(const Coord& xyz)
{
    assert ((xyz[0] & (DIM-1u)) < DIM && (xyz[1] & (DIM-1u)) < DIM && (xyz[2] & (DIM-1u)) < DIM);
    return ((xyz[0] & (DIM-1u)) << 2*Log2Dim)
         + ((xyz[1] & (DIM-1u)) << Log2Dim)
         +  (xyz[2] & (DIM-1u));
}


template<Index Log2Dim>
inline Coord
LeafNode<ValueMask, Log2Dim>::offsetToLocalCoord(Index n)
{
    assert(n < (1 << 3*Log2Dim));
    Coord xyz;
    xyz.setX(n >> 2*Log2Dim);
    n &= ((1 << 2*Log2Dim) - 1);
    xyz.setY(n >> Log2Dim);
    xyz.setZ(n & ((1 << Log2Dim) - 1));
    return xyz;
}


template<Index Log2Dim>
inline Coord
LeafNode<ValueMask, Log2Dim>::offsetToGlobalCoord(Index n) const
{
    return (this->offsetToLocalCoord(n) + this->origin());
}




template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::readTopology(std::istream& is, bool /*fromHalf*/)
{
    mBuffer.mData.load(is);
}


template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::writeTopology(std::ostream& os, bool /*toHalf*/) const
{
    mBuffer.mData.save(os);
}


template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::readBuffers(std::istream& is, const CoordBBox& clipBBox, bool fromHalf)
{
    // Boolean LeafNodes don't currently implement lazy loading.
    // Instead, load the full buffer, then clip it.

    this->readBuffers(is, fromHalf);

    // Get this tree's background value.
    bool background = false;
    if (const void* bgPtr = io::getGridBackgroundValuePtr(is)) {
        background = *static_cast<const bool*>(bgPtr);
    }
    this->clip(clipBBox, background);
}


template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::readBuffers(std::istream& is, bool /*fromHalf*/)
{
    // Read in the value mask = buffer.
    mBuffer.mData.load(is);
    // Read in the origin.
    is.read(reinterpret_cast<char*>(&mOrigin), sizeof(Coord::ValueType) * 3);
}


template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::writeBuffers(std::ostream& os, bool /*toHalf*/) const
{
    // Write out the value mask = buffer.
    mBuffer.mData.save(os);
    // Write out the origin.
    os.write(reinterpret_cast<const char*>(&mOrigin), sizeof(Coord::ValueType) * 3);
}




template<Index Log2Dim>
inline bool
LeafNode<ValueMask, Log2Dim>::operator==(const LeafNode& other) const
{
    return mOrigin == other.mOrigin && mBuffer == other.mBuffer;
}


template<Index Log2Dim>
inline bool
LeafNode<ValueMask, Log2Dim>::operator!=(const LeafNode& other) const
{
    return !(this->operator==(other));
}




template<Index Log2Dim>
inline bool
LeafNode<ValueMask, Log2Dim>::isConstant(bool& constValue, bool& state, bool) const
{
    if (!mBuffer.mData.isConstant(state)) return false;

    constValue = state;
    return true;
}



template<Index Log2Dim>
inline bool
LeafNode<ValueMask, Log2Dim>::medianAll() const
{
    const Index countTrue = mBuffer.mData.countOn();
    return countTrue > (NUM_VALUES >> 1);
}

template<Index Log2Dim>
inline Index
LeafNode<ValueMask, Log2Dim>::medianOn(bool& state) const
{
    const Index countTrueOn = mBuffer.mData.countOn();
    state = true;//since value and state are the same for this specialization of the leaf node
    return countTrueOn;
}

template<Index Log2Dim>
inline Index
LeafNode<ValueMask, Log2Dim>::medianOff(bool& state) const
{
    const Index countFalseOff = mBuffer.mData.countOff();
    state = false;//since value and state are the same for this specialization of the leaf node
    return countFalseOff;
}




template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::addTile(Index /*level*/, const Coord& xyz, bool val, bool active)
{
    this->addTile(this->coordToOffset(xyz), val, active);
}

template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::addTile(Index offset, bool val, bool active)
{
    assert(offset < SIZE);
    this->setValueOnly(offset, val);
    this->setActiveState(offset, active);
}

template<Index Log2Dim>
template<typename AccessorT>
inline void
LeafNode<ValueMask, Log2Dim>::addTileAndCache(Index level, const Coord& xyz,
    bool val, bool active, AccessorT&)
{
    this->addTile(level, xyz, val, active);
}




template<Index Log2Dim>
inline const bool&
LeafNode<ValueMask, Log2Dim>::getValue(const Coord& xyz) const
{
    // This *CANNOT* use operator ? because Visual C++
    if (mBuffer.mData.isOn(this->coordToOffset(xyz))) return Buffer::sOn; else return Buffer::sOff;
}


template<Index Log2Dim>
inline const bool&
LeafNode<ValueMask, Log2Dim>::getValue(Index offset) const
{
    assert(offset < SIZE);
    // This *CANNOT* use operator ? for Windows
    if (mBuffer.mData.isOn(offset)) return Buffer::sOn; else return Buffer::sOff;
}


template<Index Log2Dim>
inline bool
LeafNode<ValueMask, Log2Dim>::probeValue(const Coord& xyz, bool& val) const
{
    const Index offset = this->coordToOffset(xyz);
    val = mBuffer.mData.isOn(offset);
    return val;
}


template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::setValueOn(const Coord& xyz, bool val)
{
    this->setValueOn(this->coordToOffset(xyz), val);
}


template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::setValueOn(Index offset, bool val)
{
    assert(offset < SIZE);
    mBuffer.mData.set(offset, val);
}


template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::setValueOnly(const Coord& xyz, bool val)
{
    this->setValueOnly(this->coordToOffset(xyz), val);
}


template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::setActiveState(const Coord& xyz, bool on)
{
    mBuffer.mData.set(this->coordToOffset(xyz), on);
}


template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::setValueOff(const Coord& xyz, bool val)
{
    this->setValueOff(this->coordToOffset(xyz), val);
}


template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::setValueOff(Index offset, bool val)
{
    assert(offset < SIZE);
    mBuffer.mData.set(offset, val);
}


template<Index Log2Dim>
template<typename ModifyOp>
inline void
LeafNode<ValueMask, Log2Dim>::modifyValue(Index offset, const ModifyOp& op)
{
    bool val = mBuffer.mData.isOn(offset);
    op(val);
    mBuffer.mData.set(offset, val);
}


template<Index Log2Dim>
template<typename ModifyOp>
inline void
LeafNode<ValueMask, Log2Dim>::modifyValue(const Coord& xyz, const ModifyOp& op)
{
    this->modifyValue(this->coordToOffset(xyz), op);
}


template<Index Log2Dim>
template<typename ModifyOp>
inline void
LeafNode<ValueMask, Log2Dim>::modifyValueAndActiveState(const Coord& xyz, const ModifyOp& op)
{
    const Index offset = this->coordToOffset(xyz);
    bool val = mBuffer.mData.isOn(offset), state = val;
    op(val, state);
    mBuffer.mData.set(offset, val);
}




template<Index Log2Dim>
template<MergePolicy Policy>
inline void
LeafNode<ValueMask, Log2Dim>::merge(const LeafNode& other, bool /*bg*/, bool /*otherBG*/)
{
    OPENVDB_NO_UNREACHABLE_CODE_WARNING_BEGIN
    if (Policy == MERGE_NODES) return;
    mBuffer.mData |= other.mBuffer.mData;
    OPENVDB_NO_UNREACHABLE_CODE_WARNING_END
}

template<Index Log2Dim>
template<MergePolicy Policy>
inline void
LeafNode<ValueMask, Log2Dim>::merge(bool tileValue, bool)
{
    OPENVDB_NO_UNREACHABLE_CODE_WARNING_BEGIN
    if (Policy != MERGE_ACTIVE_STATES_AND_NODES) return;
    if (tileValue) mBuffer.mData.setOn();
    OPENVDB_NO_UNREACHABLE_CODE_WARNING_END
}




template<Index Log2Dim>
template<typename OtherType>
inline void
LeafNode<ValueMask, Log2Dim>::topologyUnion(const LeafNode<OtherType, Log2Dim>& other)
{
    mBuffer.mData |= other.valueMask();
}


template<Index Log2Dim>
template<typename OtherType>
inline void
LeafNode<ValueMask, Log2Dim>::topologyIntersection(const LeafNode<OtherType, Log2Dim>& other,
                                                   const bool&)
{
    mBuffer.mData &= other.valueMask();
}


template<Index Log2Dim>
template<typename OtherType>
inline void
LeafNode<ValueMask, Log2Dim>::topologyDifference(const LeafNode<OtherType, Log2Dim>& other,
                                            const bool&)
{
    mBuffer.mData &= !other.valueMask();
}




template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::clip(const CoordBBox& clipBBox, bool background)
{
    CoordBBox nodeBBox = this->getNodeBoundingBox();
    if (!clipBBox.hasOverlap(nodeBBox)) {
        // This node lies completely outside the clipping region.  Fill it with background tiles.
        this->fill(nodeBBox, background, /*active=*/false);
    } else if (clipBBox.isInside(nodeBBox)) {
        // This node lies completely inside the clipping region.  Leave it intact.
        return;
    }

    // This node isn't completely contained inside the clipping region.
    // Set any voxels that lie outside the region to the background value.

    // Construct a boolean mask that is on inside the clipping region and off outside it.
    NodeMaskType mask;
    nodeBBox.intersect(clipBBox);
    Coord xyz;
    int &x = xyz.x(), &y = xyz.y(), &z = xyz.z();
    for (x = nodeBBox.min().x(); x <= nodeBBox.max().x(); ++x) {
        for (y = nodeBBox.min().y(); y <= nodeBBox.max().y(); ++y) {
            for (z = nodeBBox.min().z(); z <= nodeBBox.max().z(); ++z) {
                mask.setOn(static_cast<Index32>(this->coordToOffset(xyz)));
            }
        }
    }

    // Set voxels that lie in the inactive region of the mask (i.e., outside
    // the clipping region) to the background value.
    for (MaskOffIter maskIter = mask.beginOff(); maskIter; ++maskIter) {
        this->setValueOff(maskIter.pos(), background);
    }
}




template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::fill(const CoordBBox& bbox, bool value, bool)
{
    auto clippedBBox = this->getNodeBoundingBox();
    clippedBBox.intersect(bbox);
    if (!clippedBBox) return;

    for (Int32 x = clippedBBox.min().x(); x <= clippedBBox.max().x(); ++x) {
        const Index offsetX = (x & (DIM-1u))<<2*Log2Dim;
        for (Int32 y = clippedBBox.min().y(); y <= clippedBBox.max().y(); ++y) {
            const Index offsetXY = offsetX + ((y & (DIM-1u))<<  Log2Dim);
            for (Int32 z = clippedBBox.min().z(); z <= clippedBBox.max().z(); ++z) {
                const Index offset = offsetXY + (z & (DIM-1u));
                mBuffer.mData.set(offset, value);
            }
        }
    }
}

template<Index Log2Dim>
inline void
LeafNode<ValueMask, Log2Dim>::fill(const bool& value, bool)
{
    mBuffer.fill(value);
}




template<Index Log2Dim>
template<typename DenseT>
inline void
LeafNode<ValueMask, Log2Dim>::copyToDense(const CoordBBox& bbox, DenseT& dense) const
{
    using DenseValueType = typename DenseT::ValueType;

    const size_t xStride = dense.xStride(), yStride = dense.yStride(), zStride = dense.zStride();
    const Coord& min = dense.bbox().min();
    DenseValueType* t0 = dense.data() + zStride * (bbox.min()[2] - min[2]); // target array
    const Int32 n0 = bbox.min()[2] & (DIM-1u);
    for (Int32 x = bbox.min()[0], ex = bbox.max()[0] + 1; x < ex; ++x) {
        DenseValueType* t1 = t0 + xStride * (x - min[0]);
        const Int32 n1 = n0 + ((x & (DIM-1u)) << 2*LOG2DIM);
        for (Int32 y = bbox.min()[1], ey = bbox.max()[1] + 1; y < ey; ++y) {
            DenseValueType* t2 = t1 + yStride * (y - min[1]);
            Int32 n2 = n1 + ((y & (DIM-1u)) << LOG2DIM);
            for (Int32 z = bbox.min()[2], ez = bbox.max()[2] + 1; z < ez; ++z, t2 += zStride) {
                *t2 = DenseValueType(mBuffer.mData.isOn(n2++));
            }
        }
    }
}


template<Index Log2Dim>
template<typename DenseT>
inline void
LeafNode<ValueMask, Log2Dim>::copyFromDense(const CoordBBox& bbox, const DenseT& dense,
                                       bool background, bool tolerance)
{
    using DenseValueType = typename DenseT::ValueType;
    struct Local {
        inline static bool toBool(const DenseValueType& v) { return !math::isZero(v); }
    };

    const size_t xStride = dense.xStride(), yStride = dense.yStride(), zStride = dense.zStride();
    const Coord& min = dense.bbox().min();
    const DenseValueType* s0 = dense.data() + zStride * (bbox.min()[2] - min[2]); // source
    const Int32 n0 = bbox.min()[2] & (DIM-1u);
    for (Int32 x = bbox.min()[0], ex = bbox.max()[0] + 1; x < ex; ++x) {
        const DenseValueType* s1 = s0 + xStride * (x - min[0]);
        const Int32 n1 = n0 + ((x & (DIM-1u)) << 2*LOG2DIM);
        for (Int32 y = bbox.min()[1], ey = bbox.max()[1] + 1; y < ey; ++y) {
            const DenseValueType* s2 = s1 + yStride * (y - min[1]);
            Int32 n2 = n1 + ((y & (DIM-1u)) << LOG2DIM);
            for (Int32 z = bbox.min()[2], ez = bbox.max()[2]+1; z < ez; ++z, ++n2, s2 += zStride) {
                // Note: if tolerance is true (i.e., 1), then all boolean values compare equal.
                if (tolerance || (background == Local::toBool(*s2))) {
                    mBuffer.mData.set(n2, background);
                } else {
                    mBuffer.mData.set(n2, Local::toBool(*s2));
                }
            }
        }
    }
}




template<Index Log2Dim>
template<typename CombineOp>
inline void
LeafNode<ValueMask, Log2Dim>::combine(const LeafNode& other, CombineOp& op)
{
    CombineArgs<bool> args;
    for (Index i = 0; i < SIZE; ++i) {
        bool result = false, aVal = mBuffer.mData.isOn(i), bVal = other.mBuffer.mData.isOn(i);
        op(args.setARef(aVal)
            .setAIsActive(aVal)
            .setBRef(bVal)
            .setBIsActive(bVal)
            .setResultRef(result));
        mBuffer.mData.set(i, result);
    }
}


template<Index Log2Dim>
template<typename CombineOp>
inline void
LeafNode<ValueMask, Log2Dim>::combine(bool value, bool valueIsActive, CombineOp& op)
{
    CombineArgs<bool> args;
    args.setBRef(value).setBIsActive(valueIsActive);
    for (Index i = 0; i < SIZE; ++i) {
        bool result = false, aVal = mBuffer.mData.isOn(i);
        op(args.setARef(aVal)
            .setAIsActive(aVal)
            .setResultRef(result));
        mBuffer.mData.set(i, result);
    }
}




template<Index Log2Dim>
template<typename CombineOp, typename OtherType>
inline void
LeafNode<ValueMask, Log2Dim>::combine2(const LeafNode& other, const OtherType& value,
    bool valueIsActive, CombineOp& op)
{
    CombineArgs<bool, OtherType> args;
    args.setBRef(value).setBIsActive(valueIsActive);
    for (Index i = 0; i < SIZE; ++i) {
        bool result = false, aVal = other.mBuffer.mData.isOn(i);
        op(args.setARef(aVal)
            .setAIsActive(aVal)
            .setResultRef(result));
        mBuffer.mData.set(i, result);
    }
}


template<Index Log2Dim>
template<typename CombineOp, typename OtherNodeT>
inline void
LeafNode<ValueMask, Log2Dim>::combine2(bool value, const OtherNodeT& other,
    bool valueIsActive, CombineOp& op)
{
    CombineArgs<bool, typename OtherNodeT::ValueType> args;
    args.setARef(value).setAIsActive(valueIsActive);
    for (Index i = 0; i < SIZE; ++i) {
        bool result = false, bVal = other.mBuffer.mData.isOn(i);
        op(args.setBRef(bVal)
            .setBIsActive(bVal)
            .setResultRef(result));
        mBuffer.mData.set(i, result);
    }
}


template<Index Log2Dim>
template<typename CombineOp, typename OtherNodeT>
inline void
LeafNode<ValueMask, Log2Dim>::combine2(const LeafNode& b0, const OtherNodeT& b1, CombineOp& op)
{
    CombineArgs<bool, typename OtherNodeT::ValueType> args;
    for (Index i = 0; i < SIZE; ++i) {
        bool result = false, b0Val = b0.mBuffer.mData.isOn(i), b1Val = b1.mBuffer.mData.isOn(i);
        op(args.setARef(b0Val)
            .setAIsActive(b0Val)
            .setBRef(b1Val)
            .setBIsActive(b1Val)
            .setResultRef(result));
        mBuffer.mData.set(i, result);
    }
}



template<Index Log2Dim>
template<typename BBoxOp>
inline void
LeafNode<ValueMask, Log2Dim>::visitActiveBBox(BBoxOp& op) const
{
    if (op.template descent<LEVEL>()) {
        for (ValueOnCIter i=this->cbeginValueOn(); i; ++i) {
            op.template operator()<LEVEL>(CoordBBox::createCube(i.getCoord(), 1));
        }
    } else {
        op.template operator()<LEVEL>(this->getNodeBoundingBox());
    }
}


template<Index Log2Dim>
template<typename VisitorOp>
inline void
LeafNode<ValueMask, Log2Dim>::visit(VisitorOp& op)
{
    doVisit<LeafNode, VisitorOp, ChildAllIter>(*this, op);
}


template<Index Log2Dim>
template<typename VisitorOp>
inline void
LeafNode<ValueMask, Log2Dim>::visit(VisitorOp& op) const
{
    doVisit<const LeafNode, VisitorOp, ChildAllCIter>(*this, op);
}


template<Index Log2Dim>
template<typename NodeT, typename VisitorOp, typename ChildAllIterT>
inline void
LeafNode<ValueMask, Log2Dim>::doVisit(NodeT& self, VisitorOp& op)
{
    for (ChildAllIterT iter = self.beginChildAll(); iter; ++iter) {
        op(iter);
    }
}




template<Index Log2Dim>
template<typename OtherLeafNodeType, typename VisitorOp>
inline void
LeafNode<ValueMask, Log2Dim>::visit2Node(OtherLeafNodeType& other, VisitorOp& op)
{
    doVisit2Node<LeafNode, OtherLeafNodeType, VisitorOp, ChildAllIter,
        typename OtherLeafNodeType::ChildAllIter>(*this, other, op);
}


template<Index Log2Dim>
template<typename OtherLeafNodeType, typename VisitorOp>
inline void
LeafNode<ValueMask, Log2Dim>::visit2Node(OtherLeafNodeType& other, VisitorOp& op) const
{
    doVisit2Node<const LeafNode, OtherLeafNodeType, VisitorOp, ChildAllCIter,
        typename OtherLeafNodeType::ChildAllCIter>(*this, other, op);
}


template<Index Log2Dim>
template<
    typename NodeT,
    typename OtherNodeT,
    typename VisitorOp,
    typename ChildAllIterT,
    typename OtherChildAllIterT>
inline void
LeafNode<ValueMask, Log2Dim>::doVisit2Node(NodeT& self, OtherNodeT& other, VisitorOp& op)
{
    // Allow the two nodes to have different ValueTypes, but not different dimensions.
    static_assert(OtherNodeT::SIZE == NodeT::SIZE,
        "can't visit nodes of different sizes simultaneously");
    static_assert(OtherNodeT::LEVEL == NodeT::LEVEL,
        "can't visit nodes at different tree levels simultaneously");

    ChildAllIterT iter = self.beginChildAll();
    OtherChildAllIterT otherIter = other.beginChildAll();

    for ( ; iter && otherIter; ++iter, ++otherIter) {
        op(iter, otherIter);
    }
}




template<Index Log2Dim>
template<typename IterT, typename VisitorOp>
inline void
LeafNode<ValueMask, Log2Dim>::visit2(IterT& otherIter, VisitorOp& op, bool otherIsLHS)
{
    doVisit2<LeafNode, VisitorOp, ChildAllIter, IterT>(*this, otherIter, op, otherIsLHS);
}


template<Index Log2Dim>
template<typename IterT, typename VisitorOp>
inline void
LeafNode<ValueMask, Log2Dim>::visit2(IterT& otherIter, VisitorOp& op, bool otherIsLHS) const
{
    doVisit2<const LeafNode, VisitorOp, ChildAllCIter, IterT>(*this, otherIter, op, otherIsLHS);
}


template<Index Log2Dim>
template<
    typename NodeT,
    typename VisitorOp,
    typename ChildAllIterT,
    typename OtherChildAllIterT>
inline void
LeafNode<ValueMask, Log2Dim>::doVisit2(NodeT& self, OtherChildAllIterT& otherIter,
    VisitorOp& op, bool otherIsLHS)
{
    if (!otherIter) return;

    if (otherIsLHS) {
        for (ChildAllIterT iter = self.beginChildAll(); iter; ++iter) {
            op(otherIter, iter);
        }
    } else {
        for (ChildAllIterT iter = self.beginChildAll(); iter; ++iter) {
            op(iter, otherIter);
        }
    }
}

} // namespace tree
} // namespace OPENVDB_VERSION_NAME
} // namespace openvdb

#endif // OPENVDB_TREE_LEAF_NODE_MASK_HAS_BEEN_INCLUDED