BUGFIX: Add 'this->' to implicit reference to parent class method. Required by g++ (std: C++17).

Victor Elarderequested to merge
vcelarde/arpackcpp:bugfix_implicitReference into master
  • g++ requires explicit this-> when referencing methods of parent classes.
  • Added this-> to arrsnsym.h to fix error encountered when using library.
  • Tested with g++ (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0.

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