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Chapter 3 User-defined Functions and Modular Development
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.. toctree::
   :maxdepth: 2
   :caption: User-defined Functions:

   /cpp/functions
   /cpp/array/array-passing
   /cpp/ref/ref-in-functions

.. toctree::
   :maxdepth: 2
   :caption: Modular Development:

   /cpp/building/modular
   /cpp/building/gpp
   /tools/make
   /cpp/testing/testing