MRMesh/MRMeshFwd.h

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#pragma once
 
#include "config.h"
 
#include "MRMesh/MRCanonicalTypedefs.h"
 
// Not-zero _ITERATOR_DEBUG_LEVEL in Microsoft STL greatly reduces the performance of STL containers.
//
// Pre-build binaries from MeshLib distribution are prepared with _ITERATOR_DEBUG_LEVEL=0,
// and if you build MeshLib by yourself then _ITERATOR_DEBUG_LEVEL=0 is also selected see
// 1) vcpkg/triplets/x64-windows-meshlib.cmake and
// 2) MeshLib/source/common.props
// Please note that all other modules (.exe, .dll, .lib) with MS STL calls in your application also need
// to define exactly the same value of _ITERATOR_DEBUG_LEVEL to be operational after linking.
//
// If you deliberately would like to work with not zero _ITERATOR_DEBUG_LEVEL, then please define
// additionally MR_ITERATOR_DEBUG_LEVEL with the same value to indicate that it is done intentionally
// (and you are ok with up to 100x slowdown).
//
#if defined _MSC_VER
    #if !defined _ITERATOR_DEBUG_LEVEL
        #define _ITERATOR_DEBUG_LEVEL 0
    #endif
    #if !defined MR_ITERATOR_DEBUG_LEVEL
        #define MR_ITERATOR_DEBUG_LEVEL 0
    #endif
    #if _ITERATOR_DEBUG_LEVEL != MR_ITERATOR_DEBUG_LEVEL
        #error _ITERATOR_DEBUG_LEVEL is inconsistent with MeshLib
    #endif
#endif
 
// Check C++ version.
#ifdef _MSC_VER
#define MR_CPP_STANDARD_DATE _MSVC_LANG
#else
#define MR_CPP_STANDARD_DATE __cplusplus
#endif
// Note `201709`. C++20 usually sets `202002`, while C++17 sets `201703`.
//   This `201709` is what GCC 10 sets on `-std=c++20` (presumably to indicate incomplete implementation?).
//   Other compilers we use don't have this issue.
// Also note `__CUDACC__` - currently our Cuda code is compiled as C++17 (compiler doesn't support C++20?),
//   and we carefully avoid headers incomaptible with C++17.
#if MR_CPP_STANDARD_DATE < 201709 && !defined(__CUDACC__)
#error Must enable C++20 or newer!
#endif
// -- Curently we have no macros that don't work with the old preprocessor. Leaving the check here to possibly be enabled later.
// Reject old MSVC preprocessor.
// Note that we exclude Cuda here. Not 100% sure if it has a good preprocessor, or we just avoid including the headers sensitive to it in Cuda.
// #if defined(_MSC_VER) && !defined(__clang__) && (!defined(_MSVC_TRADITIONAL) || _MSVC_TRADITIONAL == 1) && !defined(__CUDACC__)
// #error MSVC users must enable the new standard-conformant preprocessor using `/Zc:preprocessor`!
// #endif
 
 
#if defined(__GNUC__) && (__GNUC__ == 13 || __GNUC__ == 14)
  #pragma GCC diagnostic push
  #pragma GCC diagnostic ignored "-Warray-bounds"
  #pragma GCC diagnostic ignored "-Wstringop-overflow"
#endif
 
#include <array>
 
#if defined(__GNUC__) && (__GNUC__ == 13 || __GNUC__ == 14)
  #pragma GCC diagnostic pop
#endif
 
#include <vector>
#include <string>
#include <parallel_hashmap/phmap_fwd_decl.h>
#include <functional>
 
#ifdef _WIN32
#   ifdef MRMesh_EXPORTS
#       define MRMESH_API __declspec(dllexport)
#   else
#       define MRMESH_API __declspec(dllimport)
#   endif
#   define MRMESH_CLASS
#else
#   define MRMESH_API   __attribute__((visibility("default")))
// to fix undefined reference to `typeinfo/vtable`
// Also it's important to use this on any type for which `typeid` is used in multiple shared libraries, and then passed across library boundaries.
//   Otherwise on Mac the resulting typeids will incorrectly compare not equal.
#   define MRMESH_CLASS __attribute__((visibility("default")))
#endif
 
namespace MR
{
 
struct NoInit {};
inline constexpr NoInit noInit;
template <typename T> struct MRMESH_CLASS NoDefInit;
 
class MRMESH_CLASS EdgeTag;
class MRMESH_CLASS UndirectedEdgeTag;
class MRMESH_CLASS FaceTag;
class MRMESH_CLASS VertTag;
class MRMESH_CLASS PixelTag;
class MRMESH_CLASS VoxelTag;
class MRMESH_CLASS RegionTag;
class MRMESH_CLASS NodeTag;
class MRMESH_CLASS ObjTag;
class MRMESH_CLASS TextureTag;
class MRMESH_CLASS GraphVertTag;
class MRMESH_CLASS GraphEdgeTag;
 
MR_CANONICAL_TYPEDEFS( (template <typename T> class MRMESH_CLASS), Id,
    ( EdgeId,           Id<EdgeTag>           )
    ( UndirectedEdgeId, Id<UndirectedEdgeTag> )
    ( FaceId,           Id<FaceTag>           )
    ( VertId,           Id<VertTag>           )
    ( PixelId,          Id<PixelTag>          )
    ( VoxelId,          Id<VoxelTag>          )
    ( RegionId,         Id<RegionTag>         )
    ( NodeId,           Id<NodeTag>           )
    ( ObjId,            Id<ObjTag>            )
    ( TextureId,        Id<TextureTag>        )
    ( GraphVertId,      Id<GraphVertTag>      )
    ( GraphEdgeId,      Id<GraphEdgeTag>      )
)
 
template <typename T, typename I = size_t> class MRMESH_CLASS Buffer;
struct PackMapping;
 
class ViewportId;
class ViewportMask;
 
struct UnorientedTriangle;
struct SomeLocalTriangulations;
struct AllLocalTriangulations;
 
using EdgePath = std::vector<EdgeId>;
using EdgeLoop = std::vector<EdgeId>;
using EdgeLoops = std::vector<EdgeLoop>;
 
class MRMESH_CLASS BitSet;
 
MR_CANONICAL_TYPEDEFS( (template <typename T> class MRMESH_CLASS), TaggedBitSet,
    ( FaceBitSet,           TaggedBitSet<FaceTag>           )
    ( VertBitSet,           TaggedBitSet<VertTag>           )
    ( EdgeBitSet,           TaggedBitSet<EdgeTag>           )
    ( UndirectedEdgeBitSet, TaggedBitSet<UndirectedEdgeTag> )
    ( PixelBitSet,          TaggedBitSet<PixelTag>          )
    ( VoxelBitSet,          TaggedBitSet<VoxelTag>          )
    ( RegionBitSet,         TaggedBitSet<RegionTag>         )
    ( NodeBitSet,           TaggedBitSet<NodeTag>           )
    ( ObjBitSet,            TaggedBitSet<ObjTag>            )
    ( TextureBitSet,        TaggedBitSet<TextureTag>        )
    ( GraphVertBitSet,      TaggedBitSet<GraphVertTag>      )
    ( GraphEdgeBitSet,      TaggedBitSet<GraphEdgeTag>      )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename T> class MRMESH_CLASS), SetBitIteratorT,
    ( SetBitIterator,               SetBitIteratorT<BitSet>               )
    ( FaceSetBitIterator,           SetBitIteratorT<FaceBitSet>           )
    ( VertSetBitIterator,           SetBitIteratorT<VertBitSet>           )
    ( EdgeSetBitIterator,           SetBitIteratorT<EdgeBitSet>           )
    ( UndirectedEdgeSetBitIterator, SetBitIteratorT<UndirectedEdgeBitSet> )
)
 
struct Color;
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), MRMESH_CLASS Vector2,
    ( Vector2b,  Vector2<bool>      )
    ( Vector2i,  Vector2<int>       )
    ( Vector2ll, Vector2<long long> )
    ( Vector2f,  Vector2<float>     )
    ( Vector2d,  Vector2<double>    )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), MRMESH_CLASS Vector3,
    ( Vector3b,  Vector3<bool>      )
    ( Vector3i,  Vector3<int>       )
    ( Vector3ll, Vector3<long long> )
    ( Vector3f,  Vector3<float>     )
    ( Vector3d,  Vector3<double>    )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), Vector4,
    ( Vector4b,  Vector4<bool>      )
    ( Vector4i,  Vector4<int>       )
    ( Vector4ll, Vector4<long long> )
    ( Vector4f,  Vector4<float>     )
    ( Vector4d,  Vector4<double>    )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), Matrix2,
    ( Matrix2b,  Matrix2<bool>      )
    ( Matrix2i,  Matrix2<int>       )
    ( Matrix2ll, Matrix2<long long> )
    ( Matrix2f,  Matrix2<float>     )
    ( Matrix2d,  Matrix2<double>    )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), Matrix3,
    ( Matrix3b,  Matrix3<bool>      )
    ( Matrix3i,  Matrix3<int>       )
    ( Matrix3ll, Matrix3<long long> )
    ( Matrix3f,  Matrix3<float>     )
    ( Matrix3d,  Matrix3<double>    )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), Matrix4,
    ( Matrix4b,  Matrix4<bool>      )
    ( Matrix4i,  Matrix4<int>       )
    ( Matrix4ll, Matrix4<long long> )
    ( Matrix4f,  Matrix4<float>     )
    ( Matrix4d,  Matrix4<double>    )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), SymMatrix2,
    ( SymMatrix2b,  SymMatrix2<bool>      )
    ( SymMatrix2i,  SymMatrix2<int>       )
    ( SymMatrix2ll, SymMatrix2<long long> )
    ( SymMatrix2f,  SymMatrix2<float>     )
    ( SymMatrix2d,  SymMatrix2<double>    )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), SymMatrix3,
    ( SymMatrix3b,  SymMatrix3<bool>      )
    ( SymMatrix3i,  SymMatrix3<int>       )
    ( SymMatrix3ll, SymMatrix3<long long> )
    ( SymMatrix3f,  SymMatrix3<float>     )
    ( SymMatrix3d,  SymMatrix3<double>    )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), SymMatrix4,
    ( SymMatrix4b,  SymMatrix4<bool>      )
    ( SymMatrix4i,  SymMatrix4<int>       )
    ( SymMatrix4ll, SymMatrix4<long long> )
    ( SymMatrix4f,  SymMatrix4<float>     )
    ( SymMatrix4d,  SymMatrix4<double>    )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename V> struct), AffineXf,
    ( AffineXf2f, AffineXf<Vector2<float>>  )
    ( AffineXf2d, AffineXf<Vector2<double>> )
    ( AffineXf3f, AffineXf<Vector3<float>>  )
    ( AffineXf3d, AffineXf<Vector3<double>> )
)
template <typename T> using AffineXf2 = AffineXf<Vector2<T>>;
template <typename T> using AffineXf3 = AffineXf<Vector3<T>>;
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), RigidXf3,
    ( RigidXf3f, RigidXf3<float>  )
    ( RigidXf3d, RigidXf3<double> )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), RigidScaleXf3,
    ( RigidScaleXf3f, RigidScaleXf3<float>  )
    ( RigidScaleXf3d, RigidScaleXf3<double> )
)
 
class PointToPointAligningTransform;
class PointToPlaneAligningTransform;
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), Sphere,
    ( Sphere2f, Sphere<Vector2<float>>  )
    ( Sphere2d, Sphere<Vector2<double>> )
    ( Sphere3f, Sphere<Vector3<float>>  )
    ( Sphere3d, Sphere<Vector3<double>> )
)
template <typename T> using Sphere2 = Sphere<Vector2<T>>;
template <typename T> using Sphere3 = Sphere<Vector3<T>>;
 
MR_CANONICAL_TYPEDEFS( (template <typename V> struct), Line,
    ( Line2f, Line<Vector2<float>>  )
    ( Line2d, Line<Vector2<double>> )
    ( Line3f, Line<Vector3<float>>  )
    ( Line3d, Line<Vector3<double>> )
)
template <typename T> using Line2 = Line<Vector2<T>>;
template <typename T> using Line3 = Line<Vector3<T>>;
 
MR_CANONICAL_TYPEDEFS( (template <typename V> struct), LineSegm,
    ( LineSegm2f, LineSegm<Vector2<float>>  )
    ( LineSegm2d, LineSegm<Vector2<double>> )
    ( LineSegm3f, LineSegm<Vector3<float>>  )
    ( LineSegm3d, LineSegm<Vector3<double>> )
)
template <typename T> using LineSegm2 = LineSegm<Vector2<T>>;
template <typename T> using LineSegm3 = LineSegm<Vector3<T>>;
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), Parabola,
    ( Parabolaf, Parabola<float>  )
    ( Parabolad, Parabola<double> )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename T> class), BestFitParabola,
    ( BestFitParabolaf, BestFitParabola<float>  )
    ( BestFitParabolad, BestFitParabola<double> )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename T> class), Cylinder3,
    ( Cylinder3f, Cylinder3<float>  )
    ( Cylinder3d, Cylinder3<double> )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename T> class), Cone3,
    ( Cone3f, Cone3<float>  )
    ( Cone3d, Cone3<double> )
)
 
// No canonical typedefs here, because those ultimately boil to `std::vector`, which isn't under our control.
template <typename V> using Contour = std::vector<V>;
template <typename T> using Contour2 = Contour<Vector2<T>>;
template <typename T> using Contour3 = Contour<Vector3<T>>;
using Contour2d = Contour2<double>;
using Contour2f = Contour2<float>;
using Contour3d = Contour3<double>;
using Contour3f = Contour3<float>;
 
template <typename V> using Contours = std::vector<Contour<V>>;
template <typename T> using Contours2 = Contours<Vector2<T>>;
template <typename T> using Contours3 = Contours<Vector3<T>>;
using Contours2d = Contours2<double>;
using Contours2f = Contours2<float>;
using Contours3d = Contours3<double>;
using Contours3f = Contours3<float>;
 
template <typename T> using Contour3 = Contour<Vector3<T>>;
using Contour3d = Contour3<double>;
using Contours3d = std::vector<Contour3d>;
using Contour3f = Contour3<float>;
using Contours3f = std::vector<Contour3f>;
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), Plane3,
    ( Plane3f, Plane3<float>  )
    ( Plane3d, Plane3<double> )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename V> struct MRMESH_CLASS), Box,
    ( Box1i,  Box<int>       )
    ( Box1ll, Box<long long> )
    ( Box1f,  Box<float>     )
    ( Box1d,  Box<double>    )
    ( Box2i,  Box<Vector2<int>>       )
    ( Box2ll, Box<Vector2<long long>> )
    ( Box2f,  Box<Vector2<float>>     )
    ( Box2d,  Box<Vector2<double>>    )
    ( Box3i,  Box<Vector3<int>>       )
    ( Box3ll, Box<Vector3<long long>> )
    ( Box3f,  Box<Vector3<float>>     )
    ( Box3d,  Box<Vector3<double>>    )
)
template <typename T> using MinMax = Box<T>;
using MinMaxf = MinMax<float>;
using MinMaxd = MinMax<double>;
 
template <typename T> using Box1 = Box<T>;
template <typename T> using Box2 = Box<Vector2<T>>;
template <typename T> using Box3 = Box<Vector3<T>>;
 
MR_CANONICAL_TYPEDEFS( (template <typename V> struct MRMESH_CLASS), Ball,
    ( Ball1f,  Ball<float>     )
    ( Ball1d,  Ball<double>    )
    ( Ball2f,  Ball<Vector2<float>>     )
    ( Ball2d,  Ball<Vector2<double>>    )
    ( Ball3f,  Ball<Vector3<float>>     )
    ( Ball3d,  Ball<Vector3<double>>    )
)
template <typename T> using Ball1 = Ball<T>;
template <typename T> using Ball2 = Ball<Vector2<T>>;
template <typename T> using Ball3 = Ball<Vector3<T>>;
 
MR_CANONICAL_TYPEDEFS( (template <typename V> struct MRMESH_CLASS), CubicBezierCurve,
    ( CubicBezierCurve2f,  CubicBezierCurve<Vector2<float>>     )
    ( CubicBezierCurve2d,  CubicBezierCurve<Vector2<double>>    )
    ( CubicBezierCurve3f,  CubicBezierCurve<Vector3<float>>     )
    ( CubicBezierCurve3d,  CubicBezierCurve<Vector3<double>>    )
)
template <typename T> using CubicBezierCurve2 = CubicBezierCurve<Vector2<T>>;
template <typename T> using CubicBezierCurve3 = CubicBezierCurve<Vector3<T>>;
 
MR_CANONICAL_TYPEDEFS( (template <typename V> struct), QuadraticForm,
    ( QuadraticForm2f, QuadraticForm<Vector2<float>>  )
    ( QuadraticForm2d, QuadraticForm<Vector2<double>> )
    ( QuadraticForm3f, QuadraticForm<Vector3<float>>  )
    ( QuadraticForm3d, QuadraticForm<Vector3<double>> )
)
template <typename T> using QuadraticForm2 = QuadraticForm<Vector2<T>>;
template <typename T> using QuadraticForm3 = QuadraticForm<Vector3<T>>;
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), Quaternion,
    ( Quaternionf, Quaternion<float>  )
    ( Quaterniond, Quaternion<double> )
)
 
// No canonical typedefs because `std::array` is not under our control.
template <typename T> using Triangle3 = std::array<Vector3<T>, 3>;
using Triangle3i = Triangle3<int>;
using Triangle3f = Triangle3<float>;
using Triangle3d = Triangle3<double>;
 
class PointAccumulator;
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), SegmPoint,
    ( SegmPointf, SegmPoint<float>  )
    ( SegmPointd, SegmPoint<double> )
)
 
struct EdgePoint;
struct EdgeSegment;
using MeshEdgePoint = EdgePoint;
using SurfacePath = std::vector<MeshEdgePoint>;
using SurfacePaths = std::vector<SurfacePath>;
using IsoLine = SurfacePath;
using IsoLines = SurfacePaths;
using PlaneSection = SurfacePath;
using PlaneSections = SurfacePaths;
struct EdgePointPair;
class Laplacian;
 
using VertPair = std::pair<VertId, VertId>;
using FacePair = std::pair<FaceId, FaceId>;
using EdgePair = std::pair<EdgeId, EdgeId>;
using UndirectedEdgePair = std::pair<UndirectedEdgeId, UndirectedEdgeId>;
 
MR_CANONICAL_TYPEDEFS( (template <typename T> struct), TriPoint,
    ( TriPointf, TriPoint<float>  )
    ( TriPointd, TriPoint<double> )
)
 
struct PointOnFace;
struct PointOnObject;
struct MeshTriPoint;
struct MeshProjectionResult;
struct MeshIntersectionResult;
struct PointsProjectionResult;
template <typename T> struct IntersectionPrecomputes;
 
template <typename I> struct IteratorRange;
 
using UVCoord = Vector2f;
 
using ThreeVertIds = std::array<VertId, 3>;
 
struct MRMESH_CLASS Dipole;
 
MR_CANONICAL_TYPEDEFS( (template <typename T, typename I> class MRMESH_CLASS), Vector,
    ( Triangulation,  Vector<ThreeVertIds, FaceId> )
 
    ( Dipoles,  Vector<Dipole, NodeId> )
 
    ( FaceMap,  Vector<FaceId, FaceId> )
    ( VertMap,  Vector<VertId, VertId> )
    ( EdgeMap,  Vector<EdgeId, EdgeId> )
    ( UndirectedEdgeMap,  Vector<UndirectedEdgeId, UndirectedEdgeId> )
    ( ObjMap,  Vector<ObjId, ObjId> )
 
    ( WholeEdgeMap,  Vector<EdgeId, UndirectedEdgeId> )
    ( UndirectedEdge2RegionMap,  Vector<RegionId, UndirectedEdgeId> )
    ( Face2RegionMap,  Vector<RegionId, FaceId> )
    ( Vert2RegionMap,  Vector<RegionId, VertId> )
 
    ( VertCoords,  Vector<Vector3f, VertId> )
    ( VertCoords2, Vector<Vector2f, VertId> )
    ( VertNormals,  Vector<Vector3f, VertId> )
    ( VertUVCoords,  Vector<UVCoord, VertId> )
    ( FaceNormals,  Vector<Vector3f, FaceId> )
 
    ( TexturePerFace,  Vector<TextureId, FaceId> )
    ( VertColors,  Vector<Color, VertId> )
    ( FaceColors,  Vector<Color, FaceId> )
    ( EdgeColors,  Vector<Color, EdgeId> )
    ( UndirectedEdgeColors,  Vector<Color, UndirectedEdgeId> )
 
    ( VertScalars,  Vector<float, VertId> )
    ( FaceScalars,  Vector<float, FaceId> )
    ( EdgeScalars,  Vector<float, EdgeId> )
    ( UndirectedEdgeScalars,  Vector<float, UndirectedEdgeId> )
)
 
using VertPredicate = std::function<bool( VertId )>;
using FacePredicate = std::function<bool( FaceId )>;
using EdgePredicate = std::function<bool( EdgeId )>;
using UndirectedEdgePredicate = std::function<bool( UndirectedEdgeId )>;
 
using PreCollapseCallback = std::function<bool( EdgeId edgeToCollapse, const Vector3f& newEdgeOrgPos )>;
using OnEdgeSplit = std::function<void( EdgeId e1, EdgeId e )>;
 
template <typename T>
[[nodiscard]] inline bool contains( const std::function<bool( Id<T> )> & pred, Id<T> id )
{
    return id.valid() && ( !pred || pred( id ) );
}
 
using VertMetric = std::function<float( VertId )>;
using FaceMetric = std::function<float( FaceId )>;
using EdgeMetric = std::function<float( EdgeId )>;
using UndirectedEdgeMetric = std::function<float( UndirectedEdgeId )>;
 
MR_CANONICAL_TYPEDEFS( (template <typename T, typename I> struct MRMESH_CLASS), BMap,
    ( FaceBMap, BMap<FaceId, FaceId> )
    ( VertBMap, BMap<VertId, VertId> )
    ( EdgeBMap, BMap<EdgeId, EdgeId> )
    ( UndirectedEdgeBMap, BMap<UndirectedEdgeId, UndirectedEdgeId> )
    ( WholeEdgeBMap, BMap<EdgeId, UndirectedEdgeId> )
)
 
template <typename T, typename Hash = phmap::priv::hash_default_hash<T>, typename Eq = phmap::priv::hash_default_eq<T>>
using HashSet = phmap::flat_hash_set<T, Hash, Eq>;
template <typename T, typename Hash = phmap::priv::hash_default_hash<T>, typename Eq = phmap::priv::hash_default_eq<T>>
using ParallelHashSet = phmap::parallel_flat_hash_set<T, Hash, Eq>;
 
// No canonical typedefs because `phmap::...` is not under our control.
using FaceHashSet = HashSet<FaceId>;
using VertHashSet = HashSet<VertId>;
using EdgeHashSet = HashSet<EdgeId>;
 
template <typename K, typename V, typename Hash = phmap::priv::hash_default_hash<K>, typename Eq = phmap::priv::hash_default_eq<K>>
using HashMap = phmap::flat_hash_map<K, V, Hash, Eq>;
template <typename K, typename V, typename Hash = phmap::priv::hash_default_hash<K>, typename Eq = phmap::priv::hash_default_eq<K>>
using ParallelHashMap = phmap::parallel_flat_hash_map<K, V, Hash, Eq>;
 
using FaceHashMap = HashMap<FaceId, FaceId>;
using VertHashMap = HashMap<VertId, VertId>;
using EdgeHashMap = HashMap<EdgeId, EdgeId>;
using UndirectedEdgeHashMap = HashMap<UndirectedEdgeId, UndirectedEdgeId>;
using WholeEdgeHashMap = HashMap<UndirectedEdgeId, EdgeId>;
 
template <typename I> class UnionFind;
template <typename T, typename I, typename P> class Heap;
 
class MRMESH_CLASS MeshTopology;
struct MRMESH_CLASS Mesh;
struct MRMESH_CLASS EdgeLengthMesh;
class MRMESH_CLASS MeshOrPoints;
struct MRMESH_CLASS PointCloud;
class MRMESH_CLASS AABBTree;
class MRMESH_CLASS AABBTreePoints;
class MRMESH_CLASS AABBTreeObjects;
struct MRMESH_CLASS CloudPartMapping;
struct MRMESH_CLASS PartMapping;
struct MeshOrPointsXf;
struct MeshTexture;
struct GridSettings;
struct TriMesh;
 
MR_CANONICAL_TYPEDEFS( ( template <typename T> struct ), MRMESH_CLASS MeshRegion,
    ( MeshPart, MeshRegion<FaceTag> )
    ( MeshVertPart, MeshRegion<VertTag> )
)
 
template<typename T> class UniqueThreadSafeOwner;
template<typename T> class SharedThreadSafeOwner;
 
class PolylineTopology;
 
MR_CANONICAL_TYPEDEFS( (template<typename V> struct), Polyline,
    ( Polyline2, Polyline<Vector2f> )
    ( Polyline3, Polyline<Vector3f> )
)
 
MR_CANONICAL_TYPEDEFS( (template <typename V> class MRMESH_CLASS), AABBTreePolyline,
    ( AABBTreePolyline2, AABBTreePolyline<Vector2f> )
    ( AABBTreePolyline3, AABBTreePolyline<Vector3f> )
)
 
template<typename T> struct IntersectionPrecomputes;
template<typename T> struct IntersectionPrecomputes2;
 
MR_CANONICAL_TYPEDEFS( (template<typename V> struct [[nodiscard]]), PolylineProjectionResult,
    ( PolylineProjectionResult2, PolylineProjectionResult<Vector2f> )
    ( PolylineProjectionResult3, PolylineProjectionResult<Vector3f> )
)
 
MR_CANONICAL_TYPEDEFS( (template<typename V> struct [[nodiscard]]), PolylineProjectionWithOffsetResult,
    ( Polyline2ProjectionWithOffsetResult, PolylineProjectionWithOffsetResult<Vector2f> )
    ( PolylineProjectionWithOffsetResult3, PolylineProjectionWithOffsetResult<Vector3f> )
)
 
class DistanceMap;
struct DistanceToMeshOptions;
struct SignedDistanceToMeshOptions;
 
using GcodeSource = std::vector<std::string>;
 
class Object;
class SceneRootObject;
class VisualObject;
class ObjectMeshHolder;
class ObjectMesh;
struct ObjectMeshData;
class ObjectPointsHolder;
class ObjectPoints;
class ObjectLinesHolder;
class ObjectLines;
class ObjectDistanceMap;
class ObjectLabel;
class ObjectGcode;
class PointObject;
class LineObject;
class CircleObject;
class PlaneObject;
class SphereObject;
class CylinderObject;
class ConeObject;
 
struct LoadedObjects;
 
struct Image;
class AnyVisualizeMaskEnum;
 
class HistoryAction;
class ChangeObjectAction;
class MRMESH_CLASS ChangeSceneAction;
class ChangeMeshFaceSelectionAction;
class ChangeMeshEdgeSelectionAction;
class ChangeMeshCreasesAction;
class ChangePointPointSelectionAction;
class ChangeMeshAction;
class ChangeMeshPointsAction;
class ChangeMeshTopologyAction;
class ChangeXfAction;
class CombinedHistoryAction;
class SwapRootAction;
 
MR_CANONICAL_TYPEDEFS( (template <typename Tag> class MRMESH_CLASS), ColorMapAggregator,
    ( VertColorMapAggregator, ColorMapAggregator<VertTag> )
    ( UndirEdgeColorMapAggregator, ColorMapAggregator<UndirectedEdgeTag> )
    ( FaceColorMapAggregator, ColorMapAggregator<FaceTag> )
)
 
template<typename T>
class FewSmallest;
 
class Graph;
class WatershedGraph;
 
struct TbbTaskArenaAndGroup;
 
typedef std::function<bool( float )> ProgressCallback;
 
enum class FilterType : char
{
    Linear,
    Discrete
};
 
enum class WrapType : char
{
    Repeat,
    Mirror,
    Clamp
};
 
enum class Reorder : char
{
    None,              
    Lexicographically, 
    AABBTree           
};
 
template <typename T>
constexpr inline T sqr( T x ) noexcept { return x * x; }
 
template <typename T>
constexpr inline int sgn( T x ) noexcept { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
 
template <typename T>
constexpr inline T distance( T x, T y ) noexcept { return x >= y ? x - y : y - x; }
 
template <typename T>
constexpr inline T distanceSq( T x, T y ) noexcept { return sqr( x - y ); }
 
template <typename V, typename T>
constexpr inline auto lerp( V v0, V v1, T t ) noexcept { return ( 1 - t ) * v0 + t * v1; }
 
template<typename...>
inline constexpr bool dependent_false = false;
 
template<class... Ts>
struct overloaded : Ts... { using Ts::operator()...; };
 
// explicit deduction guide (not needed as of C++20, but still needed in Clang)
template<class... Ts>
overloaded(Ts...) -> overloaded<Ts...>;
 
class IFastWindingNumber;
class IPointsToMeshProjector;
class IPointsProjector;
 
namespace MeshBuilder
{
 
struct BuildSettings;
struct Triangle;
struct VertDuplication;
 
} //namespace MeshBuilder
 
} //namespace MR
 
#ifdef __cpp_lib_unreachable
#   define MR_UNREACHABLE std::unreachable();
#   define MR_UNREACHABLE_NO_RETURN std::unreachable();
#else
#   ifdef __GNUC__
#       define MR_UNREACHABLE __builtin_unreachable();
#       define MR_UNREACHABLE_NO_RETURN __builtin_unreachable();
#   else
#       include <cassert>
#       define MR_UNREACHABLE { assert( false ); return {}; }
#       define MR_UNREACHABLE_NO_RETURN assert( false );
#   endif
#endif