MFaceHash.h

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// Gmsh - Copyright (C) 1997-2022 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file in the Gmsh root directory for license information.
// Please report all issues on https://gitlab.onelab.info/gmsh/gmsh/issues.
 
#ifndef MFACE_HASH_H
#define MFACE_HASH_H
 
#include "MFace.h"
#include "Hash.h"
 
struct MFaceHash : public std::unary_function<MFace, size_t> {
  size_t operator()(const MFace &f) const
  {
    size_t v[4] = {0, 0, 0, 0};
    for(size_t i = 0; i < f.getNumVertices(); i++) {
      v[i] = f.getSortedVertex(i)->getNum();
    }
    return HashFNV1a<sizeof(size_t[4])>::eval(v);
  }
};
 
#endif