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.. highlight:: c
.. role:: red
.. role:: green
.. role:: param


.. _triqs__hilbert_space__stateLTHilbertSpace_ScalarType_trueGT__dot_product:

triqs::hilbert_space::state<HilbertSpace,ScalarType,true>::dot_product
======================================================================

*#include <triqs/hilbert_space.hpp>*



**Synopsis**

 .. rst-class:: cppsynopsis

       | state<type-parameter-0-0, type-parameter-0-1, true>::value_type :red:`dot_product` (:ref:`state\<type-parameter-0-0, type-parameter-0-1, true\> <triqs__hilbert_space__stateLTHilbertSpace_ScalarType_trueGT>` const & :param:`s1`,
       |              :ref:`state\<type-parameter-0-0, type-parameter-0-1, true\> <triqs__hilbert_space__stateLTHilbertSpace_ScalarType_trueGT>` const & :param:`s2`)





Calculate scalar product of two states





Parameters
^^^^^^^^^^

 * :param:`s1` First state to multiply

 * :param:`s2` Second state to multiply


Returns
^^^^^^^

Value of the scalar product