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/usr/include/c++/13.2.1/bits/stl_function.h:408:20: error: no match for ‘operator<’ (operand types are ‘const tinyobj::index_t’ and ‘const tinyobj::index_t’)
  408 |       { return __x < __y; }

namespace tinyobj {
inline bool operator<(const tinyobj::index_t &a, const tinyobj::index_t &b) {
  if (a.vertex_index < b.vertex_index)
    return true;
  if (a.vertex_index > b.vertex_index)
    return false;

  if (a.normal_index < b.normal_index)
    return true;
  if (a.normal_index > b.normal_index)
    return false;

  if (a.texcoord_index < b.texcoord_index)
    return true;
  if (a.texcoord_index > b.texcoord_index)
    return false;

  return false;
}
} // namespace tinyobj