/usr/include/deal.II/base/complex_overloads.h is in libdeal.ii-dev 8.5.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// Copyright (C) 1998 - 2016 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------
#ifndef dealii__complex_overloads_h
#define dealii__complex_overloads_h
#include <deal.II/base/config.h>
#include <deal.II/base/template_constraints.h>
DEAL_II_NAMESPACE_OPEN
// Forward declarations
template <typename T> struct EnableIfScalar;
template <typename T, typename U> struct ProductType;
#ifndef DEAL_II_HAVE_COMPLEX_OPERATOR_OVERLOADS
/**
* Provide an <tt>operator*</tt> that operates on mixed complex floating point
* types. Annoyingly, the standard library does not provide such an
* operator...
*
* @relates ProductType
*/
template <typename T, typename U>
typename ProductType<std::complex<T>, std::complex<U> >::type
inline
operator*(const std::complex<T> &left, const std::complex<U> &right)
{
typedef typename ProductType<std::complex<T>, std::complex<U> >::type result_type;
return static_cast<result_type>(left) * static_cast<result_type>(right);
}
/**
* Provide an <tt>operator*</tt> for a scalar multiplication of a complex
* floating point type with a different real floating point type. Annoyingly,
* the standard library does not provide such an operator...
*
* @relates EnableIfScalar
* @relates ProductType
*/
template <typename T, typename U>
typename ProductType<std::complex<T>, typename EnableIfScalar<U>::type>::type
inline
operator*(const std::complex<T> &left, const U &right)
{
typedef typename ProductType<std::complex<T>, U>::type result_type;
return static_cast<result_type>(left) * static_cast<result_type>(right);
}
/**
* Provide an <tt>operator*</tt> for a scalar multiplication of a real
* floating point type with a different complex floating point type.
* Annoyingly, the standard library does not provide such an operator...
*
* @relates EnableIfScalar
* @relates ProductType
*/
template <typename T, typename U>
typename ProductType<typename EnableIfScalar<T>::type, std::complex<U> >::type
inline
operator*(const T &left, const std::complex<U> &right)
{
typedef typename ProductType<std::complex<T>, U>::type result_type;
return static_cast<result_type>(left) * static_cast<result_type>(right);
}
#endif /* DEAL_II_HAVE_COMPLEX_OPERATOR_OVERLOADS */
DEAL_II_NAMESPACE_CLOSE
#endif
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