.. index:: pair: namespace; rgpot_kinds
.. _doxid-namespacergpot__kinds:

namespace rgpot_kinds
=====================

.. toctree::
	:hidden:

Overview
~~~~~~~~

Numeric kinds shared by every Fortran potential. :ref:`More...<details-namespacergpot__kinds>`


.. ref-code-block:: cpp
	:class: doxyrest-overview-code-block

	
	namespace rgpot_kinds {

	// global variables

	integer, parameter, public :ref:`wp<doxid-namespacergpot__kinds_1ab4871e7f01fd2273ea779e4784b7e43d>` = real64;
	integer, parameter, public :ref:`ip<doxid-namespacergpot__kinds_1ad755b1c0a90d439500cc987e0325e5d9>` = int32;
	integer, parameter, public :ref:`lp<doxid-namespacergpot__kinds_1a42d9cfbd48124167263b0cd3ea149078>` = int64;

	} // namespace rgpot_kinds
.. _details-namespacergpot__kinds:

Detailed Documentation
~~~~~~~~~~~~~~~~~~~~~~

Numeric kinds shared by every Fortran potential.

Kinds come from ``iso_fortran_env``, and the C-interoperable kinds of ``iso_c_binding`` are asserted against them at compile time: the ``bind(c)`` entry points hand raw ``double`` / ``int`` buffers straight to the kernels, so a mismatch would silently reinterpret memory. A failing assertion divides by zero in a constant expression, which every conforming compiler rejects.

Global Variables
----------------

.. index:: pair: variable; wp
.. _doxid-namespacergpot__kinds_1ab4871e7f01fd2273ea779e4784b7e43d:

.. ref-code-block:: cpp
	:class: doxyrest-title-code-block

	integer, parameter, public wp = real64

Working precision for every energy, force, and coordinate.

.. index:: pair: variable; ip
.. _doxid-namespacergpot__kinds_1ad755b1c0a90d439500cc987e0325e5d9:

.. ref-code-block:: cpp
	:class: doxyrest-title-code-block

	integer, parameter, public ip = int32

Index kind for atom indices crossing the C boundary.

.. index:: pair: variable; lp
.. _doxid-namespacergpot__kinds_1a42d9cfbd48124167263b0cd3ea149078:

.. ref-code-block:: cpp
	:class: doxyrest-title-code-block

	integer, parameter, public lp = int64

Wide index kind for pair counts, which exceed 2^31 on large cells.