text: // This file is part of libigl, a simple c++ geometry processing library.
  // 
  // Copyright (C) 2015 Alec Jacobson <alecjacobson@gmail.com>
  // 
  // This Source Code Form is subject to the terms of the Mozilla Public License 
  // v. 2.0. If a copy of the MPL was not distributed with this file, You can 
  // obtain one at http://mozilla.org/MPL/2.0/.
  #ifndef IGL_EXTERIOR_EDGES_H
  #define IGL_EXTERIOR_EDGES_H
  #include "igl_inline.h"
  
  namespace igl
  {
    // EXTERIOR_EDGES Determines boundary "edges" and also edges with an
    // odd number of occurrences where seeing edge (i,j) counts as +1 and seeing
    // the opposite edge (j,i) counts as -1
    //
    // Inputs:
    //   F  #F by simplex_size list of "faces"
    // Outputs:
    //   E  #E by simplex_size-1  list of exterior edges
    //
    IGL_INLINE void exterior_edges(
      const Eigen::MatrixXi & F,
      Eigen::MatrixXi & E);
    // Inline version
    IGL_INLINE Eigen::MatrixXi exterior_edges( const Eigen::MatrixXi & F);
  }
  #ifndef IGL_STATIC_LIBRARY
  #  include "exterior_edges.cpp"
  #endif
  
  #endif
  